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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 ); ?>
Output for 5.4.1 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => \ [1] => \ ) \5cArray ( [0] => \ [1] => \ ) \5cArray ( [0] => ) [1] => ) ) \29Array ( [0] => \ [1] => \ ) \5cArray ( [0] => \ [1] => \ ) \5cArray ( [0] => ) [1] => ) ) \29
Output for 5.3.0 - 5.3.29, 5.4.0
Array ( [0] => \ [1] => \ ) \5cArray ( [0] => \ [1] => \ ) \5cArray ( [0] => ) [1] => ) ) \29 Fatal error: Call to undefined function mb_ereg_replace_callback() in /in/oST38 on line 23
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/oST38 on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/oST38 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/oST38 on line 7
Process exited with code 255.

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