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); } $add_hash = function($v) { return '#' . $v; }; $new_array = change_keys($foo, $add_hash); var_dump($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)
5.4.320.0060.03812.52
5.4.310.0020.04012.52
5.4.300.0050.03512.52
5.4.290.0030.03912.52
5.4.280.0040.04412.41
5.4.270.0070.03412.42
5.4.260.0030.03912.42
5.4.250.0100.04212.41
5.4.240.0100.03712.42
5.4.230.0050.04312.41
5.4.220.0070.03712.41
5.4.210.0050.03512.41
5.4.200.0020.04012.41
5.4.190.0060.03712.41
5.4.180.0070.03612.41
5.4.170.0040.03612.41
5.4.160.0050.03512.40
5.4.150.0050.03812.40
5.4.140.0050.03612.09
5.4.130.0050.03412.07
5.4.120.0030.03612.04
5.4.110.0030.04212.04
5.4.100.0060.04612.04
5.4.90.0030.03912.04
5.4.80.0070.03812.04
5.4.70.0050.03712.04
5.4.60.0080.03412.03
5.4.50.0060.03512.03
5.4.40.0090.03112.02
5.4.30.0060.03712.02
5.4.20.0060.04012.01
5.4.10.0060.03412.02
5.4.00.0060.03511.51
5.3.290.0070.03712.80
5.3.280.0060.04412.71
5.3.270.0020.04212.72
5.3.260.0070.03712.71
5.3.250.0030.03912.72
5.3.240.0020.04012.72
5.3.230.0040.03912.71
5.3.220.0070.03812.68
5.3.210.0050.03812.68
5.3.200.0040.03612.68
5.3.190.0120.03112.67
5.3.180.0090.03812.68
5.3.170.0050.04312.67
5.3.160.0040.03712.67
5.3.150.0050.03712.67
5.3.140.0060.03812.66
5.3.130.0050.04312.66
5.3.120.0080.03612.65
5.3.110.0080.03612.66
5.3.100.0080.03712.11
5.3.90.0060.03412.08
5.3.80.0100.03712.08
5.3.70.0040.03712.07
5.3.60.0060.03512.07
5.3.50.0070.03412.00
5.3.40.0040.03812.00
5.3.30.0120.03511.95
5.3.20.0050.03511.72
5.3.10.0040.03911.70
5.3.00.0070.03311.68
5.2.170.0070.0269.18
5.2.160.0050.0279.18
5.2.150.0070.0279.18
5.2.140.0040.0309.18
5.2.130.0050.0339.14
5.2.120.0070.0279.14
5.2.110.0060.0279.15
5.2.100.0040.0289.14
5.2.90.0060.0269.14
5.2.80.0020.0329.13
5.2.70.0060.0319.14
5.2.60.0040.0309.09
5.2.50.0050.0299.05
5.2.40.0080.0319.03
5.2.30.0030.0319.01
5.2.20.0060.0269.00
5.2.10.0030.0288.92
5.2.00.0030.0298.78
5.1.60.0040.0238.07
5.1.50.0040.0238.06
5.1.40.0060.0288.04
5.1.30.0040.0298.40
5.1.20.0050.0308.42
5.1.10.0010.0328.14
5.1.00.0020.0278.14
5.0.50.0040.0256.62
5.0.40.0030.0266.48
5.0.30.0050.0346.29
5.0.20.0050.0186.27
5.0.10.0050.0186.24
5.0.00.0040.0296.23
4.4.90.0020.0164.78
4.4.80.0020.0154.76
4.4.70.0040.0144.75
4.4.60.0040.0134.76
4.4.50.0030.0144.77
4.4.40.0020.0254.71
4.4.30.0020.0204.76
4.4.20.0020.0164.84
4.4.10.0020.0164.85
4.4.00.0060.0214.76
4.3.110.0020.0184.67
4.3.100.0040.0164.66
4.3.90.0040.0214.63
4.3.80.0040.0294.58
4.3.70.0010.0154.63
4.3.60.0010.0164.63
4.3.50.0030.0214.63
4.3.40.0030.0284.54
4.3.30.0010.0223.29
4.3.20.0050.0123.26
4.3.10.0030.0143.22
4.3.00.0000.0237.21

preferences:
139.93 ms | 1386 KiB | 7 Q