Online PHP editor | output for i9pdS

@ 2015-10-05T17:13:28Z

<?php

$subject = 'Aaaafaba Bbab';

$ret = preg_replace_callback_array(
    [
     	'~[a]+~i' => function ($match) {
            echo strlen($match[0]), ' matches for "a" found', PHP_EOL;
        },
	    '~[b]+~i' => function ($match) {
            echo strlen($match[0]), ' matches for "b" found', PHP_EOL;
        }
    ],
    $subject
);

var_dump($ret);
var_dump($subject);

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 4 matches for "a" found 1 matches for "a" found 1 matches for "a" found 1 matches for "a" found 1 matches for "b" found 3 matches for "b" found string(2) "f " string(13) "Aaaafaba Bbab"
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: Fatal error: Call to undefined function preg_replace_callback_array() in /in/i9pdS on line 5
Process exited with code 255.

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