3v4l.org

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<?php define(EFFECTIVE DATE, ''); if (empty(EFFECTIVEDATE)) {echo '01/06/2014';} else {echo EFFECTIVEDATE;} ?>
Output for 5.4.0 - 5.4.30
Parse error: syntax error, unexpected 'DATE' (T_STRING) in /in/78SQS on line 2
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_STRING in /in/78SQS on line 2
Process exited with code 255.

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