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<?php $str = "oAA34Ao#\\\\oo(+--)o/"; preg_replace_callback( '/([\x00-\x1F\*\(\)\\\\])/', function ($matches) { print_r($matches); $x = "\\".join("", unpack("H2", $matches[1])); echo $x; return $x; }, $str ); $str = " oAA34Ao#\\(\oo+--)o/"; function matches($matches) { print_r($matches); $x = "\\".join("", unpack("H2", $matches[1])); echo $x; return $x; } mb_ereg_replace_callback( '([\x00-\x1F\*\(\)\\\\])', "matches", $str ); ?>

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