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)
5.4.320.0040.04012.50
5.4.310.0040.04212.49
5.4.300.0020.03912.50
5.4.290.0090.04112.49
5.4.280.0030.03612.39
5.4.270.0040.03712.39
5.4.260.0020.04212.39
5.4.250.0030.03912.39
5.4.240.0050.04712.39
5.4.230.0060.03512.38
5.4.220.0050.03512.38
5.4.210.0050.04112.38
5.4.200.0070.04112.38
5.4.190.0070.03712.38
5.4.180.0030.03812.38
5.4.170.0030.03712.38
5.4.160.0060.03512.38
5.4.150.0080.03312.38
5.4.140.0040.03712.07
5.4.130.0030.03712.05
5.4.120.0070.03312.02
5.4.110.0050.03512.01
5.4.100.0050.03512.01
5.4.90.0050.03612.01
5.4.80.0080.03412.01
5.4.70.0030.03612.01
5.4.60.0110.03512.01
5.4.50.0070.03812.01
5.4.40.0050.03412.00
5.4.30.0090.03811.99
5.4.20.0070.03211.99
5.4.10.0050.04212.00
5.4.00.0040.03711.49
5.3.290.0050.04312.80
5.3.280.0050.04512.71
5.3.270.0090.03912.72
5.3.260.0110.03712.72
5.3.250.0110.03712.72
5.3.240.0070.03612.72
5.3.230.0110.03812.71
5.3.220.0040.03612.68
5.3.210.0050.03712.68
5.3.200.0080.03612.68
5.3.190.0080.03812.68
5.3.180.0070.03512.68
5.3.170.0030.04312.67
5.3.160.0060.03912.67
5.3.150.0040.03812.68
5.3.140.0080.04412.66
5.3.130.0070.03612.66
5.3.120.0070.03612.66
5.3.110.0030.04012.66
5.3.100.0070.03312.12
5.3.90.0060.03412.08
5.3.80.0050.03512.08
5.3.70.0050.03612.07
5.3.60.0060.03712.07
5.3.50.0070.03312.00
5.3.40.0030.03712.00
5.3.30.0050.03411.95
5.3.20.0050.03411.72
5.3.10.0020.03711.70
5.3.00.0050.03611.68
5.2.170.0040.0309.18
5.2.160.0040.0299.18
5.2.150.0020.0329.18
5.2.140.0070.0359.18
5.2.130.0060.0269.14
5.2.120.0040.0289.14
5.2.110.0060.0269.15
5.2.100.0030.0289.14
5.2.90.0090.0289.14
5.2.80.0030.0349.14
5.2.70.0010.0339.14
5.2.60.0020.0329.09
5.2.50.0030.0309.06
5.2.40.0010.0319.03
5.2.30.0040.0299.01
5.2.20.0040.0289.00
5.2.10.0080.0308.93
5.2.00.0040.0318.79
5.1.60.0060.0238.07
5.1.50.0040.0238.06
5.1.40.0070.0208.05
5.1.30.0050.0288.40
5.1.20.0050.0298.41
5.1.10.0040.0258.14
5.1.00.0050.0248.14
5.0.50.0030.0206.62
5.0.40.0040.0186.48
5.0.30.0050.0296.29
5.0.20.0010.0216.26
5.0.10.0010.0216.24
5.0.00.0020.0316.23
4.4.90.0010.0164.78
4.4.80.0020.0224.76
4.4.70.0020.0164.75
4.4.60.0020.0164.76
4.4.50.0030.0144.77
4.4.40.0010.0264.71
4.4.30.0040.0144.75
4.4.20.0020.0154.84
4.4.10.0020.0164.85
4.4.00.0060.0214.76
4.3.110.0010.0174.67
4.3.100.0040.0144.66
4.3.90.0020.0144.64
4.3.80.0010.0264.59
4.3.70.0040.0134.63
4.3.60.0040.0134.63
4.3.50.0030.0154.63
4.3.40.0020.0244.54
4.3.30.0000.0173.28
4.3.20.0020.0213.26
4.3.10.0020.0193.22
4.3.00.0100.0277.21

preferences:
143.03 ms | 1394 KiB | 7 Q