Online PHP editor | output for r9ZlN

@ 2018-11-03T12:33:42Z

<?php
function custom_chunk($array, $maxrows) {
    $result = [];
    $size = sizeof($array);
    $columns = ceil($size / $maxrows);
    $fullrows = $size - ($columns - 1) * $maxrows;
    
    for ($i = 0; $i < $maxrows; ++$i) {
        $result[] = implode(', ', array_splice($array, 0, ($i < $fullrows ? $columns : $columns - 1)));
    }
    return $result;
}

$data = ['Item 1', 'Item 2', 'Item 3', 'Item 4', 'Item 5', 'Item 6', 'Item 7'];

var_export(custom_chunk($data, 3));

Output for 5.6.38, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: array ( 0 => 'Item 1, Item 2, Item 3', 1 => 'Item 4, Item 5', 2 => 'Item 6, Item 7', )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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