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@ 2017-03-30T13:04:30Z

<?php

$regex = '/\{link ([0-9]+)/';
$subject = 'Hello World! {link 123456#abc}TEST{/link} Bla!';

echo preg_replace_callback($regex, function (array $matches) {
    var_export($matches);
    return $matches[1] . 'ABC';
}, $subject);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive preview

61.72 ms | 402 KiB | 5 Q