3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = "▒▒▒Y#CzdU▒BB▒(ȅi▒](▒▒▒▒W▒dv▒▒6m▒▒▒~▒▒▒{A։9fI΄#`I▒▒Q▒▒▒o▒▒tE▒▒]▒'J▒▒ `▒*q▒▒X}▒▒▒▒)P{▒-hs▒▒Uz▒6▒i▒▒▒J▒I"; preg_match_all('([a-zA-Z0-9]{1})', $foo, $matches); var_dump($matches);

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