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<?php echo preg_replace_callback'/([a-z])(_[a-z])/', function($a) { var_dump($a);}, 'rob_tr_yuui');
Output for 5.4.0 - 5.4.23
Parse error: syntax error, unexpected ''/([a-z])(_[a-z])/'' (T_CONSTANT_ENCAPSED_STRING), expecting ',' or ';' in /in/ZqA3C on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ',' or ';' in /in/ZqA3C on line 3
Process exited with code 255.