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<?php $xml = new SimpleXMLElement('<data/>'); $value="This & That"; $value = preg_replace_callback('/&[^; ]{0,6}.?/', "((substr('\\0',-1) == ';') ? '\\0' : '&amp;'.substr('\\0',1))", trim($value)); $xml->addChild('header', $value);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, function "((substr('\0',-1) == ';') ? '\0' : '&amp;'.substr('\0',1))" not found or invalid function name in /in/h3cZH:5 Stack trace: #0 /in/h3cZH(5): preg_replace_callback('/&[^; ]{0,6}.?/', '((substr('\\0',-...', 'This & That') #1 {main} thrown in /in/h3cZH on line 5
Process exited with code 255.

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