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@ 2018-11-11T11:13:49Z

<?php
$input = "[link=xxx]xxx[/link] [link=yyy][/link]";
echo preg_replace_callback('/\[link=(.*?)\](.*?)\[\/link\]/', 
                           function ($m) { 
                               return "<a href=\"$m[1]\">" . (strlen($m[2]) ? $m[2] : $m[1]) . '</a>'; 
                           },
                           $input);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)

preferences:dark modelive previewkey bindings

34.24 ms | 404 KiB | 5 Q