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run code in 200+ php & hhvm versions
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<?php $pattern = <<<'PATTERN' /(?xJ) (?<DN>Mon|Fri|Sun)(?:day)?| (?<DN>Tue)(?:sday)?| (?<DN>Wed)(?:nesday)?| (?<DN>Thu)(?:rsday)?| (?<DN>Sat)(?:urday)? / PATTERN; $subject = "Monday\nThursday"; preg_match_all($pattern, $subject, $matches1, PREG_PATTERN_ORDER); var_dump($matches);
Output for 5.3.0 - 7.3.0rc4
Notice: Undefined variable: matches in /in/DBtdG on line 14 NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_SL in /in/DBtdG on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_SL in /in/DBtdG on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/DBtdG on line 3
Process exited with code 255.