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@ 2014-04-10T22:23:12Z

<?php
preg_replace_callback(
        '~\[admin(.+?)\[/admin\]~is',
        function($m) {
            return '[admin' . strtr(un_htmlspecialchars($m[1]), array("\n" => '&#13;', '  ' => ' &#32;')) . '[/admin]';
        },
        '[admin]test[/admin]'
);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
strtr: documentation ( source)

preferences:dark modelive preview

41.88 ms | 402 KiB | 5 Q