Cart Library in CodeIgniter 4

Admin

2 years ago

CodeIgniter 4 officially not supporting Cart Library like CI3. but we will use the same cart in CI4. Let’s get Started.

STEP 1

Create a file ‘Cart.php’ in ‘app/Libraries/’. e.g. (app/Libraries/Cart.php) and Copy Bellow Code to your Codeigniter 4 App/Libraries/Cart.php

<?php
namespace App\Libraries {

    use Config\Services;

    /**
     * The Cart class is a basic port of the CodeIgniter 3 cart module for 
     * CodeIgniter 4.
     *
     * @package    App\Libraries
     *
     * @copyright  Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
     * @copyright  Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
     * @link       https://codeigniter.com/user_guide/libraries/cart.html
     * @license    http://opensource.org/licenses/MIT
     * @author     EllisLab Dev Team
     * @since      1.0.0
     * @deprecated 3.0.0
     */
    class Cart
    {
        /**
         * These are the regular expression rules that we use to validate the product ID and product name
         * alpha-numeric, dashes, underscores, or periods
         *
         * @var string
         */
        public $productIdRules = '\.a-z0-9_-';

        /**
         * These are the regular expression rules that we use to validate the product ID and product name
         * alpha-numeric, dashes, underscores, colons or periods
         *
         * @var string
         */
        public $productNameRules = '\w \-\.\:';

        /**
         * only allow safe product names
         *
         * @var bool
         */
        public $productNameSafe = true;

        /**
         * Contents of the cart
         *
         * @var array
         */
        protected $cartContents = [];

        /**
         * Session Service
         *
         * @var \CodeIgniter\Session\Session $session
         */
        protected $session;

        // ------------------------------------------------------------------------

        /**
         * Shopping Class Constructor
         *
         * The constructor loads the Session class, used to store the shopping cart contents.
         */
        public function __construct()
        {
            $this->session = Services::session();

            // Grab the shopping cart array from the session table
            $this->cartContents = $this->session->get('cart_contents');
            if ( $this->cartContents === null ) {
                // No cart exists so we'll set some base values
                $this->cartContents = [ 'cart_total' => 0, 'total_items' => 0 ];
            }

            log_message('info', 'Cart Class Initialized');
        }

        // --------------------------------------------------------------------

        /**
         * Insert items into the cart and save it to the session table
         *
         * @param array $items
         *
         * @return bool
         */
        public function insert($items = []): bool
        {
            // Was any cart data passed? No? Bah...
            if ( ! is_array($items) || count($items) === 0 ) {
                log_message('error', 'The insert method must be passed an array containing data.');
                return false;
            }

            // You can either insert a single product using a one-dimensional array,
            // or multiple products using a multi-dimensional one. The way we
            // determine the array type is by looking for a required array key named "id"
            // at the top level. If it's not found, we will assume it's a multi-dimensional array.

            $save_cart = false;
            if ( isset($items[ 'id' ]) ) {
                if ( ( $rowid = $this->_insert($items) ) ) {
                    $save_cart = true;
                }
            } else {
                foreach ( $items as $val ) {
                    if ( is_array($val) && isset($val[ 'id' ]) && $this->_insert($val) ) {
                        $save_cart = true;
                    }
                }
            }

            // Save the cart data if the insert was successful
            if ( $save_cart === true ) {
                $this->saveCart();
                return $rowid ?? true;
            }

            return false;
        }

        // ------------------------------------------------------------------------

        /**
         * Insert
         *
         * @param array $items
         * @return bool|string
         */
        protected function _insert($items = [])
        {
            // Was any cart data passed? No? Bah...
            if ( ! is_array($items) || count($items) === 0 ) {
                log_message('error', 'The insert method must be passed an array containing data.');
                return false;
            }

            // --------------------------------------------------------------------

            // Does the $items array contain an id, quantity, price, and name?  These are required
            if ( ! isset($items[ 'id' ], $items[ 'qty' ], $items[ 'price' ], $items[ 'name' ]) ) {
                log_message('error', 'The cart array must contain a product ID, quantity, price, and name.');
                return false;
            }

            // --------------------------------------------------------------------

            // Prep the quantity. It can only be a number.  Duh... also trim any leading zeros
            $items[ 'qty' ] = (float)$items[ 'qty' ];

            // If the quantity is zero or blank there's nothing for us to do
            if ( $items[ 'qty' ] === 0 ) {
                return false;
            }

            // --------------------------------------------------------------------

            // Validate the product ID. It can only be alpha-numeric, dashes, underscores or periods
            // Not totally sure we should impose this rule, but it seems prudent to standardize IDs.
            // Note: These can be user-specified by setting the $this->product_id_rules variable.
            if ( ! preg_match('/^[' . $this->productIdRules . ']+$/i', $items[ 'id' ]) ) {
                log_message('error', 'Invalid product ID.  The product ID can only contain alpha-numeric characters, dashes, and underscores');
                return false;
            }

            // --------------------------------------------------------------------

            // Validate the product name. It can only be alpha-numeric, dashes, underscores, colons or periods.
            // Note: These can be user-specified by setting the $this->product_name_rules variable.
            if ( $this->productNameSafe && ! preg_match('/^[' . $this->productNameRules . ']+$/i' . ( true ? 'u' : '' ), $items[ 'name' ]) ) {
                log_message('error', 'An invalid name was submitted as the product name: ' . $items[ 'name' ] . ' The name can only contain alpha-numeric characters, dashes, underscores, colons, and spaces');
                return false;
            }

            // --------------------------------------------------------------------

            // Prep the price. Remove leading zeros and anything that isn't a number or decimal point.
            $items[ 'price' ] = (float)$items[ 'price' ];

            // We now need to create a unique identifier for the item being inserted into the cart.
            // Every time something is added to the cart it is stored in the master cart array.
            // Each row in the cart array, however, must have a unique index that identifies not only
            // a particular product, but makes it possible to store identical products with different options.
            // For example, what if someone buys two identical t-shirts (same product ID), but in
            // different sizes?  The product ID (and other attributes, like the name) will be identical for
            // both sizes because it's the same shirt. The only difference will be the size.
            // Internally, we need to treat identical submissions, but with different options, as a unique product.
            // Our solution is to convert the options array to a string and MD5 it along with the product ID.
            // This becomes the unique "row ID"
            if ( isset($items[ 'options' ]) && count($items[ 'options' ]) > 0 ) {
                $rowid = md5($items[ 'id' ] . serialize($items[ 'options' ]));
            } else {
                // No options were submitted so we simply MD5 the product ID.
                // Technically, we don't need to MD5 the ID in this case, but it makes
                // sense to standardize the format of array indexes for both conditions
                $rowid = md5($items[ 'id' ]);
            }

            // --------------------------------------------------------------------

            // Now that we have our unique "row ID", we'll add our cart items to the master array
            // grab quantity if it's already there and add it on
            $old_quantity = isset($this->cartContents[ $rowid ][ 'qty' ]) ? (int)$this->cartContents[ $rowid ][ 'qty' ] : 0;

            // Re-create the entry, just to make sure our index contains only the data from this submission
            $items[ 'rowid' ] = $rowid;
            $items[ 'qty' ] += $old_quantity;
            $this->cartContents[ $rowid ] = $items;

            return $rowid;
        }

        // ------------------------------------------------------------------------

        /**
         * Update the cart
         *
         * This function permits the quantity of a given item to be changed.
         * Typically it is called from the "view cart" page if a user makes
         * changes to the quantity before checkout. That array must contain the
         * product ID and quantity for each item.
         *
         * @param array $items
         * @return bool
         */
        public function update($items = []): bool
        {
            // Was any cart data passed?
            if ( ! is_array($items) || count($items) === 0 ) {
                return false;
            }

            // You can either update a single product using a one-dimensional array,
            // or multiple products using a multi-dimensional one.  The way we
            // determine the array type is by looking for a required array key named "rowid".
            // If it's not found we assume it's a multi-dimensional array
            $save_cart = false;
            if ( isset($items[ 'rowid' ]) ) {
                if ( $this->_update($items) === true ) {
                    $save_cart = true;
                }
            } else {
                foreach ( $items as $val ) {
                    if ( is_array($val) && isset($val[ 'rowid' ]) && $this->_update($val) === true ) {
                        $save_cart = true;
                    }
                }
            }

            // Save the cart data if the insert was successful
            if ( $save_cart === true ) {
                $this->saveCart();
                return true;
            }

            return false;
        }

        // ------------------------------------------------------------------------

        /**
         * Update the cart
         *
         * This function permits changing item properties.
         * Typically it is called from the "view cart" page if a user makes
         * changes to the quantity before checkout. That array must contain the
         * rowid and quantity for each item.
         *
         * @param array $items
         * @return bool
         */
        protected function _update($items = []): bool
        {
            // Without these array indexes there is nothing we can do
            if ( ! isset($items[ 'rowid' ], $this->cartContents[ $items[ 'rowid' ] ]) ) {
                return false;
            }

            // Prep the quantity
            if ( isset($items[ 'qty' ]) ) {
                $items[ 'qty' ] = (float)$items[ 'qty' ];
                // Is the quantity zero?  If so we will remove the item from the cart.
                // If the quantity is greater than zero we are updating
                if ( $items[ 'qty' ] === 0 ) {
                    unset($this->cartContents[ $items[ 'rowid' ] ]);
                    return true;
                }
            }

            // find updatable keys
            $keys = array_intersect(array_keys($this->cartContents[ $items[ 'rowid' ] ]), array_keys($items));
            // if a price was passed, make sure it contains valid data
            if ( isset($items[ 'price' ]) ) {
                $items[ 'price' ] = (float)$items[ 'price' ];
            }

            // product id & name shouldn't be changed
            foreach ( array_diff($keys, [ 'id', 'name' ]) as $key ) {
                $this->cartContents[ $items[ 'rowid' ] ][ $key ] = $items[ $key ];
            }

            return true;
        }

        // ------------------------------------------------------------------------

        /**
         * Save the cart array to the session DB
         *
         * @return bool
         */
        protected function saveCart(): bool
        {
            // Let's add up the individual prices and set the cart sub-total
            $this->cartContents[ 'total_items' ] = $this->cartContents[ 'cart_total' ] = 0;
            foreach ( $this->cartContents as $key => $val ) {
                // We make sure the array contains the proper indexes
                if ( ! is_array($val) || ! isset($val[ 'price' ], $val[ 'qty' ]) ) {
                    continue;
                }

                $this->cartContents[ 'cart_total' ] += ( $val[ 'price' ] * $val[ 'qty' ] );
                $this->cartContents[ 'total_items' ] += $val[ 'qty' ];
                $this->cartContents[ $key ][ 'subtotal' ] = ( $this->cartContents[ $key ][ 'price' ] * $this->cartContents[ $key ][ 'qty' ] );
            }

            // Is our cart empty? If so we delete it from the session
            if ( count($this->cartContents) <= 2 ) {
                $this->session->remove('cart_contents');

                // Nothing more to do... coffee time!
                return false;
            }

            // If we made it this far it means that our cart has data.
            // Let's pass it to the Session class so it can be stored
            $this->session->set('cart_contents', $this->cartContents);

            // Woot!
            return true;
        }

        // ------------------------------------------------------------------------

        /**
         * Cart Total
         *
         * @return mixed
         */
        public function total()
        {
            return $this->cartContents[ 'cart_total' ];
        }

        // ------------------------------------------------------------------------

        /**
         * Remove Item
         *
         * Removes an item from the cart
         *
         * @param $rowid
         *
         * @return bool
         */
        public function remove($rowid): bool
        {
            // unset & save
            unset($this->cartContents[ $rowid ]);
            $this->saveCart();
            return true;
        }

        // ------------------------------------------------------------------------

        /**
         * Total Items
         *
         * Returns the total item count
         *
         * @return mixed
         */
        public function totalItems()
        {
            return $this->cartContents[ 'total_items' ];
        }

        // ------------------------------------------------------------------------

        /**
         * Cart Contents
         *
         * Returns the entire cart array
         *
         * @param bool $newest_first
         * @return array
         */
        public function contents($newest_first = false): array
        {
            // do we want the newest first?
            $cart = ( $newest_first ) ? array_reverse($this->cartContents) : $this->cartContents;

            // Remove these so they don't create a problem when showing the cart table
            unset($cart[ 'total_items' ], $cart[ 'cart_total' ]);

            return $cart;
        }

        // ------------------------------------------------------------------------

        /**
         * Get cart item
         *
         * Returns the details of a specific item in the cart
         *
         * @param $row_id
         * @return bool|mixed
         */
        public function getItem($row_id)
        {
            return ( in_array($row_id, [ 'total_items', 'cart_total' ], true) OR ! isset($this->cartContents[ $row_id ]) )
                ? false
                : $this->cartContents[ $row_id ];
        }

        // ------------------------------------------------------------------------

        /**
         * Has options
         *
         * Returns TRUE if the rowid passed to this function correlates to an item
         * that has options associated with it.
         *
         * @param string $row_id
         * @return bool
         */
        public function hasOptions($row_id = ''): bool
        {
            return ( isset($this->cartContents[ $row_id ][ 'options' ]) && count($this->cartContents[ $row_id ][ 'options' ]) !== 0 );
        }

        // ------------------------------------------------------------------------

        /**
         * Product options
         *
         * Returns the an array of options, for a particular product row ID
         *
         * @param string $row_id
         * @return array|mixed
         */
        public function productOptions($row_id = '')
        {
            return $this->cartContents[ $row_id ][ 'options' ] ?? [];
        }

        // ------------------------------------------------------------------------

        /**
         * Format Number
         *
         * Returns the supplied number with commas and a decimal point.
         *
         * @param string $n
         * @return string
         */
        public function formatNumber($n = ''): string
        {
            return ( $n === '' ) ? '' : number_format((float)$n, 2);
        }

        // ------------------------------------------------------------------------

        /**
         * Destroy the cart
         *
         * Empties the cart and kills the session
         */
        public function destroy(): void
        {
            $this->cartContents = [ 'cart_total' => 0, 'total_items' => 0 ];
            $this->session->remove('cart_contents');
        }

        // ------------------------------------------------------------------------
    }
}
?>

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<?php

namespace App\Libraries {

use Config\Services;

/**

* The Cart class is a basic port of the CodeIgniter 3 cart module for

* CodeIgniter 4.

* @package App\Libraries

* @link https://codeigniter.com/user_guide/libraries/cart.html

* @license http://opensource.org/licenses/MIT

* @author EllisLab Dev Team

* @since 1.0.0

* @deprecated 3.0.0

class Cart

{

/**

* These are the regular expression rules that we use to validate the product ID and product name

* alpha-numeric, dashes, underscores, or periods

* @var string

public $productIdRules = '\.a-z0-9_-';

/**

* These are the regular expression rules that we use to validate the product ID and product name

* alpha-numeric, dashes, underscores, colons or periods

* @var string

public $productNameRules = '\w \-\.\:';

/**

* only allow safe product names

* @var bool

public $productNameSafe = true;

/**

* Contents of the cart

* @var array

protected $cartContents = [];

/**

* Session Service

* @var \CodeIgniter\Session\Session $session

protected $session;

// ------------------------------------------------------------------------

/**

* Shopping Class Constructor

* The constructor loads the Session class, used to store the shopping cart contents.

public function __construct()

{

$this->session = Services::session();

// Grab the shopping cart array from the session table

$this->cartContents = $this->session->get('cart_contents');

if ( $this->cartContents === null ) {

// No cart exists so we'll set some base values

$this->cartContents = [ 'cart_total' => 0, 'total_items' => 0 ];

}

log_message('info', 'Cart Class Initialized');

}

// --------------------------------------------------------------------

/**

* Insert items into the cart and save it to the session table

* @param array $items

* @return bool

public function insert($items = []): bool

{

// Was any cart data passed? No? Bah...

if ( ! is_array($items) || count($items) === 0 ) {

log_message('error', 'The insert method must be passed an array containing data.');

return false;

}

// You can either insert a single product using a one-dimensional array,

// or multiple products using a multi-dimensional one. The way we

// determine the array type is by looking for a required array key named "id"

// at the top level. If it's not found, we will assume it's a multi-dimensional array.

$save_cart = false;

if ( isset($items[ 'id' ]) ) {

if ( ( $rowid = $this->_insert($items) ) ) {

$save_cart = true;

}

} else {

foreach ( $items as $val ) {

if ( is_array($val) && isset($val[ 'id' ]) && $this->_insert($val) ) {

$save_cart = true;

}

// Save the cart data if the insert was successful

if ( $save_cart === true ) {

$this->saveCart();

return $rowid ?? true;

}

return false;

}

// ------------------------------------------------------------------------

/**

* Insert

* @param array $items

* @return bool|string

protected function _insert($items = [])

{

// Was any cart data passed? No? Bah...

if ( ! is_array($items) || count($items) === 0 ) {

log_message('error', 'The insert method must be passed an array containing data.');

return false;

}

// --------------------------------------------------------------------

// Does the $items array contain an id, quantity, price, and name? These are required

if ( ! isset($items[ 'id' ], $items[ 'qty' ], $items[ 'price' ], $items[ 'name' ]) ) {

log_message('error', 'The cart array must contain a product ID, quantity, price, and name.');

return false;

}

// --------------------------------------------------------------------

// Prep the quantity. It can only be a number. Duh... also trim any leading zeros

$items[ 'qty' ] = (float)$items[ 'qty' ];

// If the quantity is zero or blank there's nothing for us to do

if ( $items[ 'qty' ] === 0 ) {

return false;

}

// --------------------------------------------------------------------

// Validate the product ID. It can only be alpha-numeric, dashes, underscores or periods

// Not totally sure we should impose this rule, but it seems prudent to standardize IDs.

// Note: These can be user-specified by setting the $this->product_id_rules variable.

if ( ! preg_match('/^[' . $this->productIdRules . ']+$/i', $items[ 'id' ]) ) {

log_message('error', 'Invalid product ID. The product ID can only contain alpha-numeric characters, dashes, and underscores');

return false;

}

// --------------------------------------------------------------------

// Validate the product name. It can only be alpha-numeric, dashes, underscores, colons or periods.

// Note: These can be user-specified by setting the $this->product_name_rules variable.

if ( $this->productNameSafe && ! preg_match('/^[' . $this->productNameRules . ']+$/i' . ( true ? 'u' : '' ), $items[ 'name' ]) ) {

log_message('error', 'An invalid name was submitted as the product name: ' . $items[ 'name' ] . ' The name can only contain alpha-numeric characters, dashes, underscores, colons, and spaces');

return false;

}

// --------------------------------------------------------------------

// Prep the price. Remove leading zeros and anything that isn't a number or decimal point.

$items[ 'price' ] = (float)$items[ 'price' ];

// We now need to create a unique identifier for the item being inserted into the cart.

// Every time something is added to the cart it is stored in the master cart array.

// Each row in the cart array, however, must have a unique index that identifies not only

// a particular product, but makes it possible to store identical products with different options.

// For example, what if someone buys two identical t-shirts (same product ID), but in

// different sizes? The product ID (and other attributes, like the name) will be identical for

// both sizes because it's the same shirt. The only difference will be the size.

// Internally, we need to treat identical submissions, but with different options, as a unique product.

// Our solution is to convert the options array to a string and MD5 it along with the product ID.

// This becomes the unique "row ID"

if ( isset($items[ 'options' ]) && count($items[ 'options' ]) > 0 ) {

$rowid = md5($items[ 'id' ] . serialize($items[ 'options' ]));

} else {

// No options were submitted so we simply MD5 the product ID.

// Technically, we don't need to MD5 the ID in this case, but it makes

// sense to standardize the format of array indexes for both conditions

$rowid = md5($items[ 'id' ]);

}

// --------------------------------------------------------------------

// Now that we have our unique "row ID", we'll add our cart items to the master array

// grab quantity if it's already there and add it on

$old_quantity = isset($this->cartContents[ $rowid ][ 'qty' ]) ? (int)$this->cartContents[ $rowid ][ 'qty' ] : 0;

// Re-create the entry, just to make sure our index contains only the data from this submission

$items[ 'rowid' ] = $rowid;

$items[ 'qty' ] += $old_quantity;

$this->cartContents[ $rowid ] = $items;

return $rowid;

}

// ------------------------------------------------------------------------

/**

* Update the cart

* This function permits the quantity of a given item to be changed.

* Typically it is called from the "view cart" page if a user makes

* changes to the quantity before checkout. That array must contain the

* product ID and quantity for each item.

* @param array $items

* @return bool

public function update($items = []): bool

{

// Was any cart data passed?

if ( ! is_array($items) || count($items) === 0 ) {

return false;

}

// You can either update a single product using a one-dimensional array,

// or multiple products using a multi-dimensional one. The way we

// determine the array type is by looking for a required array key named "rowid".

// If it's not found we assume it's a multi-dimensional array

$save_cart = false;

if ( isset($items[ 'rowid' ]) ) {

if ( $this->_update($items) === true ) {

$save_cart = true;

}

} else {

foreach ( $items as $val ) {

if ( is_array($val) && isset($val[ 'rowid' ]) && $this->_update($val) === true ) {

$save_cart = true;

}

// Save the cart data if the insert was successful

if ( $save_cart === true ) {

$this->saveCart();

return true;

}

return false;

}

// ------------------------------------------------------------------------

/**

* Update the cart

* This function permits changing item properties.

* Typically it is called from the "view cart" page if a user makes

* changes to the quantity before checkout. That array must contain the

* rowid and quantity for each item.

* @param array $items

* @return bool

protected function _update($items = []): bool

{

// Without these array indexes there is nothing we can do

if ( ! isset($items[ 'rowid' ], $this->cartContents[ $items[ 'rowid' ] ]) ) {

return false;

}

// Prep the quantity

if ( isset($items[ 'qty' ]) ) {

$items[ 'qty' ] = (float)$items[ 'qty' ];

// Is the quantity zero? If so we will remove the item from the cart.

// If the quantity is greater than zero we are updating

if ( $items[ 'qty' ] === 0 ) {

unset($this->cartContents[ $items[ 'rowid' ] ]);

return true;

}

// find updatable keys

$keys = array_intersect(array_keys($this->cartContents[ $items[ 'rowid' ] ]), array_keys($items));

// if a price was passed, make sure it contains valid data

if ( isset($items[ 'price' ]) ) {

$items[ 'price' ] = (float)$items[ 'price' ];

}

// product id & name shouldn't be changed

foreach ( array_diff($keys, [ 'id', 'name' ]) as $key ) {

$this->cartContents[ $items[ 'rowid' ] ][ $key ] = $items[ $key ];

}

return true;

}

// ------------------------------------------------------------------------

/**

* Save the cart array to the session DB

* @return bool

protected function saveCart(): bool

{

// Let's add up the individual prices and set the cart sub-total

$this->cartContents[ 'total_items' ] = $this->cartContents[ 'cart_total' ] = 0;

foreach ( $this->cartContents as $key => $val ) {

// We make sure the array contains the proper indexes

if ( ! is_array($val) || ! isset($val[ 'price' ], $val[ 'qty' ]) ) {

continue;

}

$this->cartContents[ 'cart_total' ] += ( $val[ 'price' ] * $val[ 'qty' ] );

$this->cartContents[ 'total_items' ] += $val[ 'qty' ];

$this->cartContents[ $key ][ 'subtotal' ] = ( $this->cartContents[ $key ][ 'price' ] * $this->cartContents[ $key ][ 'qty' ] );

}

// Is our cart empty? If so we delete it from the session

if ( count($this->cartContents) <= 2 ) {

$this->session->remove('cart_contents');

// Nothing more to do... coffee time!

return false;

}

// If we made it this far it means that our cart has data.

// Let's pass it to the Session class so it can be stored

$this->session->set('cart_contents', $this->cartContents);

// Woot!

return true;

}

// ------------------------------------------------------------------------

/**

* Cart Total

* @return mixed

public function total()

{

return $this->cartContents[ 'cart_total' ];

}

// ------------------------------------------------------------------------

/**

* Remove Item

* Removes an item from the cart

* @param $rowid

* @return bool

public function remove($rowid): bool

{

// unset & save

unset($this->cartContents[ $rowid ]);

$this->saveCart();

return true;

}

// ------------------------------------------------------------------------

/**

* Total Items

* Returns the total item count

* @return mixed

public function totalItems()

{

return $this->cartContents[ 'total_items' ];

}

// ------------------------------------------------------------------------

/**

* Cart Contents

* Returns the entire cart array

* @param bool $newest_first

* @return array

public function contents($newest_first = false): array

{

// do we want the newest first?

$cart = ( $newest_first ) ? array_reverse($this->cartContents) : $this->cartContents;

// Remove these so they don't create a problem when showing the cart table

unset($cart[ 'total_items' ], $cart[ 'cart_total' ]);

return $cart;

}

// ------------------------------------------------------------------------

/**

* Get cart item

* Returns the details of a specific item in the cart

* @param $row_id

* @return bool|mixed

public function getItem($row_id)

{

return ( in_array($row_id, [ 'total_items', 'cart_total' ], true) OR ! isset($this->cartContents[ $row_id ]) )

? false

: $this->cartContents[ $row_id ];

}

// ------------------------------------------------------------------------

/**

* Has options

* Returns TRUE if the rowid passed to this function correlates to an item

* that has options associated with it.

* @param string $row_id

* @return bool

public function hasOptions($row_id = ''): bool

{

return ( isset($this->cartContents[ $row_id ][ 'options' ]) && count($this->cartContents[ $row_id ][ 'options' ]) !== 0 );

}

// ------------------------------------------------------------------------

/**

* Product options

* Returns the an array of options, for a particular product row ID

* @param string $row_id

* @return array|mixed

public function productOptions($row_id = '')

{

return $this->cartContents[ $row_id ][ 'options' ] ?? [];

}

// ------------------------------------------------------------------------

/**

* Format Number

* Returns the supplied number with commas and a decimal point.

* @param string $n

* @return string

public function formatNumber($n = ''): string

{

return ( $n === '' ) ? '' : number_format((float)$n, 2);

}

// ------------------------------------------------------------------------

/**

* Destroy the cart

* Empties the cart and kills the session

public function destroy(): void

{

$this->cartContents = [ 'cart_total' => 0, 'total_items' => 0 ];

$this->session->remove('cart_contents');

}

// ------------------------------------------------------------------------

}

STEP 2

Copy Bellow Code to your Codeigniter 4 app/Config/Services.php

public static function cart($getShared = true)
{
        if ($getShared) {
            return static::getSharedInstance('cart');
        }
        return new \App\Libraries\Cart();
 }

public static function cart($getShared = true)

{

if ($getShared) {

return static::getSharedInstance('cart');

}

return new \App\Libraries\Cart();

}

STEP 3

Copy Bellow Code to your Codeigniter 4 app/Common.php

function cart(bool $getShared = true)
{
    return \Config\Services::cart($getShared);
}

function cart(bool $getShared = true)

{

return \Config\Services::cart($getShared);

}

That’s DONE, Now you can use cart() like ci3. example given below

// Call the cart service using the helper function

$cart = cart();



// Insert an array of values

$cart->insert(array(

   'id'      => 'sku_1234ABCD',

   'qty'     => 1,

   'price'   => '19.56',

   'name'    => 'T-Shirt',

   'options' => array('Size' => 'L', 'Color' => 'Red')

));



// Update an array of values

$cart->update(array(

   'rowid'   => '345e7fc8446e81e16883e9a812db8',

   'id'      => 'sku_1234ABCD',

   'qty'     => 3,

   'price'   => '24.89',

   'name'    => 'T-Shirt',

   'options' => array('Size' => 'L', 'Color' => 'Red')

));



// Get the total items

$cart->totalItems();



// Remove an item using its `rowid`

$cart->remove('4166b0e7fc8446e81e16883e9a812db8');

 

// Clear the shopping cart

$cart->destroy();



// Get the cart contents as an array

$cart->contents();

// Call the cart service using the helper function

$cart = cart();

// Insert an array of values

$cart->insert(array(

'id' => 'sku_1234ABCD',

'qty' => 1,

'price' => '19.56',

'name' => 'T-Shirt',

'options' => array('Size' => 'L', 'Color' => 'Red')

));

// Update an array of values

$cart->update(array(

'rowid' => '345e7fc8446e81e16883e9a812db8',

'id' => 'sku_1234ABCD',

'qty' => 3,

'price' => '24.89',

'name' => 'T-Shirt',

'options' => array('Size' => 'L', 'Color' => 'Red')

));

// Get the total items

$cart->totalItems();

// Remove an item using its `rowid`

$cart->remove('4166b0e7fc8446e81e16883e9a812db8');

// Clear the shopping cart

$cart->destroy();

// Get the cart contents as an array

$cart->contents();

Credit : Manoj Bist