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<?php $str = "oAAAoooo"; echo preg_replace_callback( '/([\x00-\x1F\*\(\)\\\\])/', function ($matches) { return "\\".join("", unpack("H2", $matches[1])); }, $str ); $str = "oAAAoooo"; function matches($matches) { return "\\".join("", unpack("H2", $matches[1])); } echo '<br><br>' . 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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
oAAAoooo<br><br>oAAAoooo
Output for 5.3.0 - 5.3.29, 5.4.0
oAAAoooo Fatal error: Call to undefined function mb_ereg_replace_callback() in /in/jdENb on line 18
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/jdENb 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/jdENb on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/jdENb on line 7
Process exited with code 255.

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