3v4l.org

run code in 300+ PHP versions simultaneously
<?php function datediffInWeeks($date1, $date2) { if($date1 > $date2) return datediffInWeeks($date2, $date1); $first = DateTime::createFromFormat('m/d/Y', $date1); $second = DateTime::createFromFormat('m/d/Y', $date2); return floor($first->diff($second)->days/7); } $q = new DateTime('First Week of 2015') var_dump($q);// 21

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)
5.6.150.0030.08718.18
5.6.140.0100.03318.18
5.6.130.0030.05718.17
5.6.120.0100.08021.01
5.6.110.0070.06021.10
5.6.100.0030.04020.89
5.6.90.0000.04320.97
5.6.80.0070.03720.39
5.5.300.0030.07018.09
5.5.290.0000.04718.07
5.5.280.0130.03020.78
5.5.270.0170.05720.79
5.5.260.0070.07320.89
5.5.250.0130.07720.56
5.5.240.3770.04020.11

preferences:
137.23 ms | 1394 KiB | 7 Q