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@ 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 git.master, git.master_jit, rfc.property-hooks: 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

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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