3v4l.org

run code in 300+ PHP versions simultaneously
<?php $username = 'skope'; $timestamp = microtime(); $hash = substr(sha1(implode([$username, $timestamp]), 0, 20); var_dump($hash); var_dump(strlen($hash));

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
7.0.00.0030.09020.23
5.6.160.0100.05320.51
5.6.150.0000.04718.18
5.6.140.0070.07018.15
5.6.130.0030.04018.28
5.6.120.0070.08021.00
5.6.110.0100.07721.13
5.6.100.0130.07720.97
5.6.90.0070.08021.01
5.6.80.0100.04720.42
5.5.300.0030.06317.97
5.5.290.0030.07018.01
5.5.280.0170.03720.77
5.5.270.0000.04320.95
5.5.260.0030.04720.76
5.5.250.0070.06720.46
5.5.240.0200.07720.23

preferences:
137.77 ms | 1394 KiB | 7 Q