3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = [ 'a' => '1', 'b' => '1', 'c' => '2', ]; function change_keys($array, $callback) { $temp = array_map($callback, array_combine(array_keys($array), array_keys($array))); return array_combine($temp, $array); } var_dump(change_keys($foo, function($v) { return '#' . $v; }));

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)
5.4.320.0300.06718.95
5.4.310.0230.03719.22
5.4.300.0330.05319.15
5.4.290.0270.07319.16
5.4.280.0270.04719.08
5.4.270.0230.05019.21
5.4.260.0270.03719.22
5.4.250.0270.03319.30
5.4.240.0330.06019.21
5.4.230.0230.05019.23
5.4.220.0300.06718.98
5.4.210.0270.04718.97
5.4.200.0330.06318.87
5.4.190.0300.05718.86
5.4.180.0200.05018.82
5.4.170.0230.03719.25
5.4.160.0300.04719.05
5.4.150.0130.05019.07
5.4.140.0230.05316.46
5.4.130.0270.05316.36
5.4.120.0270.03316.35
5.4.110.0200.04016.41
5.4.100.0200.04016.28
5.4.90.0170.04016.19
5.4.80.0230.07316.56
5.4.70.0230.03716.57
5.4.60.0330.06016.51
5.4.50.0270.07016.43
5.4.40.0300.05016.49
5.4.30.0300.05316.43
5.4.20.0300.05716.30
5.4.10.0370.05316.52
5.4.00.0330.06015.77
5.3.290.0300.04014.59
5.3.280.0270.03314.50
5.3.270.0170.05014.43
5.3.260.0270.07314.65
5.3.250.0330.04314.45
5.3.240.0300.06714.51
5.3.230.0270.05014.55
5.3.220.0330.07714.42
5.3.210.0270.03314.53
5.3.200.0270.07014.55
5.3.190.0300.04014.50
5.3.180.0270.07014.59
5.3.170.0270.05014.41
5.3.160.0230.06314.42
5.3.150.0270.04714.51
5.3.140.0270.07014.50
5.3.130.0270.04714.40
5.3.120.0300.06714.64
5.3.110.0230.06314.64
5.3.100.0270.04314.02
5.3.90.0230.05014.00
5.3.80.0270.07713.86
5.3.70.0270.05313.89
5.3.60.0230.05013.95
5.3.50.0270.05313.93
5.3.40.0300.04313.82
5.3.30.0300.06013.81
5.3.20.0230.05013.64
5.3.10.0300.04013.56
5.3.00.0370.06313.48
5.2.170.0300.05012.00
5.2.160.0230.03312.00
5.2.150.0270.04712.00
5.2.140.0200.06012.00
5.2.130.0230.04012.00
5.2.120.0230.04712.00
5.2.110.0200.05712.00
5.2.100.0300.05312.00
5.2.90.0200.05312.00
5.2.80.0200.05712.00
5.2.70.0230.04712.00
5.2.60.0170.05312.00
5.2.50.0270.04712.00
5.2.40.0330.04712.00
5.2.30.0170.05012.00
5.2.20.0170.03012.00
5.2.10.0170.06012.00
5.2.00.0200.05012.00
5.1.60.0130.03012.00
5.1.50.0230.04712.00
5.1.40.0200.04012.00
5.1.30.0200.05312.00
5.1.20.0170.05312.00
5.1.10.0170.05012.00
5.1.00.0170.03312.00
5.0.50.0100.03712.00
5.0.40.0130.03712.00
5.0.30.0170.05312.00
5.0.20.0130.02312.00
5.0.10.0170.04012.00
5.0.00.0030.07312.00
4.4.90.0070.03012.00
4.4.80.0170.02712.00
4.4.70.0100.03712.00
4.4.60.0100.03712.00
4.4.50.0070.03712.00
4.4.40.0130.04012.00
4.4.30.0070.03712.00
4.4.20.0100.02712.00
4.4.10.0130.03012.00
4.4.00.0100.03012.00
4.3.110.0070.02312.00
4.3.100.0070.02712.00
4.3.90.0070.01712.00
4.3.80.0100.05312.00
4.3.70.0130.02712.00
4.3.60.0130.03012.00
4.3.50.0170.03012.00
4.3.40.0100.05012.00
4.3.30.0030.03012.00
4.3.20.0070.03712.00
4.3.10.0070.02712.00
4.3.00.0070.02712.00

preferences:
142.83 ms | 1394 KiB | 7 Q