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@ 2021-02-25T09:39:33Z

<?php

$string = 'sample {} test {} string {}';
$count = 0;
echo preg_replace_callback("~{}~", function($m) use (&$count) {
    return '(' . $count++ . ')';
}, $string);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)

preferences:dark modelive previewkey bindings

27.43 ms | 404 KiB | 5 Q