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run code in 200+ php & hhvm versions
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<?php //As an example $phone = $_POST['user_phone'] = "123456789"; echo $phone = preg_replace('/^(\d)/', '0$1', $phone); //^ ^ ^^ Slightly modified
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.2.6
0123456789
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/thqss on line 9
Process exited with code 255.