3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { public $a = new stdClass; public $b; } $a = new A; $a->b = $a; var_dump(serialize([$new stdClass, $a]));

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)
7.0.00.0170.08020.09
5.6.160.0070.08320.39
5.6.150.0000.08718.27
5.6.140.0030.08718.11
5.6.130.0070.07718.21
5.6.120.0100.05321.13
5.6.110.0100.08721.00
5.6.100.0000.08720.96
5.6.90.0170.07321.10
5.6.80.0100.06720.44
5.5.300.0070.08017.98
5.5.290.0070.08018.03
5.5.280.0130.05020.80
5.5.270.0070.08320.86
5.5.260.0130.03720.76
5.5.250.0130.07320.47
5.5.240.0170.05720.18

preferences:
132.59 ms | 1398 KiB | 7 Q