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); } $new_array = change_keys($foo, function($v) {   return '#' . $v; }); var_dump($new_array);

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)
5.4.320.0050.03712.49
5.4.310.0080.04112.50
5.4.300.0040.04412.49
5.4.290.0100.04212.49
5.4.280.0060.04812.39
5.4.270.0080.03312.39
5.4.260.0080.03512.39
5.4.250.0070.03512.39
5.4.240.0030.03812.39
5.4.230.0070.03512.38
5.4.220.0060.03612.38
5.4.210.0070.03412.38
5.4.200.0060.03712.38
5.4.190.0090.03212.38
5.4.180.0070.03412.38
5.4.170.0070.03412.39
5.4.160.0030.03712.38
5.4.150.0020.03912.38
5.4.140.0030.03912.07
5.4.130.0050.04412.05
5.4.120.0090.03312.01
5.4.110.0030.03912.01
5.4.100.0070.03312.01
5.4.90.0070.03512.01
5.4.80.0050.03712.01
5.4.70.0040.05112.00
5.4.60.0070.03412.01
5.4.50.0060.03512.01
5.4.40.0050.03412.00
5.4.30.0050.03511.99
5.4.20.0060.03411.98
5.4.10.0040.03511.99
5.4.00.0060.03411.48
5.3.290.0080.03712.80
5.3.280.0050.03812.71
5.3.270.0030.04212.72
5.3.260.0030.04712.72
5.3.250.0030.05512.72
5.3.240.0080.04012.72
5.3.230.0070.03712.71
5.3.220.0040.03912.68
5.3.210.0070.03812.68
5.3.200.0040.03812.68
5.3.190.0060.03912.67
5.3.180.0050.03712.67
5.3.170.0050.03812.67
5.3.160.0070.03612.68
5.3.150.0090.03512.67
5.3.140.0070.03512.66
5.3.130.0070.03712.65
5.3.120.0040.04012.66
5.3.110.0020.04312.66
5.3.100.0070.03812.12
5.3.90.0070.03512.08
5.3.80.0060.03612.07
5.3.70.0040.03812.07
5.3.60.0040.03712.07
5.3.50.0060.03612.00
5.3.40.0040.03712.00
5.3.30.0050.03611.95
5.3.20.0040.03711.72
5.3.10.0040.03611.70
5.3.00.0080.03611.68
5.2.170.0070.0299.18
5.2.160.0050.0289.18
5.2.150.0060.0289.18
5.2.140.0050.0309.18
5.2.130.0040.0299.14
5.2.120.0030.0309.14
5.2.110.0040.0309.15
5.2.100.0050.0289.14
5.2.90.0040.0299.14
5.2.80.0070.0329.14
5.2.70.0030.0319.14
5.2.60.0030.0319.09
5.2.50.0040.0299.05
5.2.40.0040.0289.03
5.2.30.0060.0279.01
5.2.20.0020.0319.00
5.2.10.0050.0298.93
5.2.00.0040.0298.79
5.1.60.0040.0248.07
5.1.50.0090.0258.06
5.1.40.0030.0298.05
5.1.30.0040.0298.40
5.1.20.0070.0228.42
5.1.10.0040.0268.14
5.1.00.0050.0238.14
5.0.50.0030.0216.62
5.0.40.0010.0206.48
5.0.30.0020.0336.29
5.0.20.0010.0296.27
5.0.10.0040.0216.23
5.0.00.0060.0336.23
4.4.90.0030.0234.78
4.4.80.0040.0194.75
4.4.70.0020.0154.76
4.4.60.0020.0154.75
4.4.50.0020.0194.77
4.4.40.0020.0254.70
4.4.30.0020.0234.76
4.4.20.0030.0154.84
4.4.10.0010.0174.85
4.4.00.0040.0244.76
4.3.110.0020.0154.67
4.3.100.0020.0154.66
4.3.90.0010.0164.64
4.3.80.0040.0234.58
4.3.70.0010.0154.63
4.3.60.0030.0144.63
4.3.50.0030.0224.63
4.3.40.0020.0234.53
4.3.30.0010.0193.28
4.3.20.0030.0183.26
4.3.10.0060.0153.22
4.3.00.0000.0237.21

preferences:
140.43 ms | 1394 KiB | 7 Q