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run code in 150+ php & hhvm versions
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<?php $email = "mail@example.com";  if (filter_var($email, FILTER_VALIDATE_EMAIL))   {       echo '"' . $email . '" = Valid';  }  else   {       echo '"' . $email . '" = Invalid';  }  ?>  - See more at: http://www.w3resource.com/php-exercises/php-basic-exercises.php#EDITOR
based on kuLmD
Output for 5.4.0 - 5.4.31
Parse error: syntax error, unexpected '"mail@example.com"' (T_CONSTANT_ENCAPSED_STRING) in /in/8PBCr on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.28
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in /in/8PBCr on line 2
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_CONSTANT_ENCAPSED_STRING in /in/8PBCr on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/8PBCr on line 2
Process exited with code 255.