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run code in 150+ php & hhvm versions
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<?php function a($pattern, $subject, &$matches = null) { return preg_match($patter, $subject, $matches); } $r = a('~[a|b]+~', 'aaaa', $matches); var_dump($r, $matches); $r = a('~[a|b]+~', 'aaaa'); var_dump($r);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: preg_match(): Empty regular expression in /in/rZZrc on line 5 bool(false) NULL Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: preg_match(): Empty regular expression in /in/rZZrc on line 5 bool(false)
Output for hhvm-3.12.0
Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: Empty regular expression in /in/rZZrc on line 5 bool(false) NULL Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: Empty regular expression in /in/rZZrc on line 5 bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.4 - 5.1.6
Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: preg_match(): Empty regular expression in /in/rZZrc on line 5 bool(false) array(0) { } Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: preg_match(): Empty regular expression in /in/rZZrc on line 5 bool(false)
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: preg_match(): Empty regular expression in /in/rZZrc on line 5 bool(false) array(0) { } Notice: Undefined variable: patter in /in/rZZrc on line 5 Warning: preg_match(): Empty regular expression in /in/rZZrc on line 5 bool(false)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '=', expecting ')' in /in/rZZrc on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '=', expecting ')' in /in/rZZrc on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/rZZrc on line 3
Process exited with code 255.