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run code in 200+ php & hhvm versions
Bugs & Features
<?php $key = md5("i"); $i = 0; $str = ""; while ($i < strlen($key)) { if (strpos($str, $key[$i]) === false) { $str .= $key[$i]; } $i++; } echo $str;
Output for 4.3.0 - 7.3.0rc4
865c0b4ae371