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run code in 200+ php & hhvm versions
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<?php $value = '+31'; $values = array('31'); var_dump(in_array("$value", $values)); // true
based on XfZ5M
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.2.6
bool(true)
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/39bNj on line 7
Process exited with code 255.