Get Value from multiple checkbox with comma separated in PHP

<form action="index.php" method="post">
<input type="checkbox" name="category_list[]" value="1">Category 1&nbsp;
<input type="checkbox" name="category_list[]" value="2">Category 2&nbsp;
<input type="checkbox" name="category_list[]" value="3">Category 3&nbsp;
<input type="checkbox" name="category_list[]" value="4">Category 4&nbsp;
<input type="checkbox" name="category_list[]" value="5">Category 5&nbsp;
<input type="submit" value="Add" />
</form>


<?php
if(isset($_POST['category_list']))
{
$category_list = array();
foreach($_POST['category_list'] as $val)
{
$category_list[] = (int) $val;
}
$category_list = implode(',', $category_list);
echo "Categories are :- ".''.$category_list;
exit;
}
?>

<input type="checkbox" name="category_list[]" value="1">Category 1 

<input type="checkbox" name="category_list[]" value="2">Category 2 

<input type="checkbox" name="category_list[]" value="3">Category 3 

<input type="checkbox" name="category_list[]" value="4">Category 4 

<input type="checkbox" name="category_list[]" value="5">Category 5 

</form>

<?php

if(isset($_POST['category_list']))

{

$category_list = array();

foreach($_POST['category_list'] as $val)

{

$category_list[] = (int) $val;

}

$category_list = implode(',', $category_list);

echo "Categories are :- ".''.$category_list;

exit;

}

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