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run code in 150+ php & hhvm versions
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<?php echo base64_encode(md5("1", true)); ?>
Output for 5.0.0 - 7.1.0
xMpCOKC5I4INzFCab3WEmw==
Output for 4.3.0 - 4.4.9
Warning: Wrong parameter count for md5() in /in/N9llK on line 2