Online PHP editor | output for nfEjR

@ 2022-07-29T07:00:01Z

<?php

$array = [
    ['s1','s2','s5','s1','s25','s1','s6','s6','s1'],
    2 => ['a2','a1','a4'],
    [],
    []
];
$result = [];
foreach ($array as $subarray) {
    if ($subarray) {
        $result[] = implode(',', $subarray);
    }
}
echo implode(',', $result);

echo "\n\n---\n\n";

array_walk_recursive(
    $array,
    function($v) {
        static $first;
        echo $first . $v;
        $first = ',';
    }
);

echo "\n\n---\n\n";

echo implode(
         ',',
         preg_match_all(
             '/[a-z]\d+/',
             json_encode($array),
             $out
         )
         ? $out[0]
         : []
     );

echo "\n\n---\n\n";

echo implode(
         ',',
         preg_split(
             '/\W+/',
             json_encode(array_values($array)),
             0,
             PREG_SPLIT_NO_EMPTY
         )
     );

Output for 7.4.0 - 7.4.33, 8.0.1 - 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 - 8.5.1: s1,s2,s5,s1,s25,s1,s6,s6,s1,a2,a1,a4 --- s1,s2,s5,s1,s25,s1,s6,s6,s1,a2,a1,a4 --- s1,s2,s5,s1,s25,s1,s6,s6,s1,a2,a1,a4 --- s1,s2,s5,s1,s25,s1,s6,s6,s1,a2,a1,a4
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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