3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array("person1" => array(0 => array('k1'=>'v1', 'k2'=>'v2'), 1 => array('k1'=>'v1', 'k2'=>'v2')), "person2" => array(0 => array('k1'=>'v1', 'k2'=>'v2'), 1 => array('k1'=>'v1', 'k2'=>'v2'))); reset($array); $first_key = key($array); echo $first_key;

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)
8.3.40.0100.00718.85
8.3.30.0070.00718.79
8.3.20.0040.00420.39
8.3.10.0120.00620.54
8.3.00.0070.00319.26
8.2.170.0090.00622.96
8.2.160.0110.00421.11
8.2.150.0080.00024.18
8.2.140.0030.00624.66
8.2.130.0080.00026.16
8.2.120.0070.00021.03
8.2.110.0060.00322.08
8.2.100.0080.00417.91
8.2.90.0040.00419.22
8.2.80.0080.00017.97
8.2.70.0030.00517.63
8.2.60.0050.00318.03
8.2.50.0080.00018.07
8.2.40.0080.00018.22
8.2.30.0060.00319.34
8.2.20.0000.00917.56
8.2.10.0040.00418.04
8.2.00.0050.00217.79
8.1.270.0090.00023.91
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0030.00624.03
8.1.230.0040.00819.04
8.1.220.0000.00717.79
8.1.210.0030.00518.77
8.1.200.0060.00317.23
8.1.190.0040.00417.23
8.1.180.0040.00418.10
8.1.170.0060.00318.65
8.1.160.0040.00421.86
8.1.150.0050.00218.79
8.1.140.0040.00417.38
8.1.130.0040.00417.88
8.1.120.0000.00717.36
8.1.110.0050.00217.42
8.1.100.0070.00017.39
8.1.90.0050.00317.35
8.1.80.0000.00817.28
8.1.70.0040.00417.28
8.1.60.0040.00417.53
8.1.50.0050.00317.47
8.1.40.0040.00417.33
8.1.30.0040.00417.61
8.1.20.0000.00817.64
8.1.10.0040.00417.51
8.1.00.0030.00517.43
8.0.300.0050.00218.77
8.0.290.0000.00816.88
8.0.280.0070.00018.51
8.0.270.0040.00417.25
8.0.260.0030.00317.14
8.0.250.0030.00316.99
8.0.240.0070.00016.94
8.0.230.0000.00716.72
8.0.220.0040.00416.86
8.0.210.0040.00416.79
8.0.200.0060.00016.91
8.0.190.0030.00316.76
8.0.180.0070.00016.79
8.0.170.0040.00416.75
8.0.160.0040.00416.95
8.0.150.0000.00716.62
8.0.140.0040.00416.69
8.0.130.0060.00013.22
8.0.120.0000.00816.76
8.0.110.0000.00716.84
8.0.100.0000.00716.72
8.0.90.0040.00416.69
8.0.80.0000.02016.78
8.0.70.0070.00016.86
8.0.60.0080.00016.84
8.0.50.0040.00416.77
8.0.30.0170.00516.99
8.0.20.0080.01017.40
8.0.10.0050.00216.98
8.0.00.0120.00816.58
7.4.330.0050.00015.03
7.4.320.0030.00316.48
7.4.300.0030.00316.43
7.4.290.0070.00016.50
7.4.280.0040.00416.44
7.4.270.0030.00316.34
7.4.260.0030.00516.55
7.4.250.0000.00716.46
7.4.240.0060.00116.46
7.4.230.0030.00316.54
7.4.220.0060.01216.54
7.4.210.0040.01116.61
7.4.200.0050.00216.61
7.4.160.0030.01216.36
7.4.150.0090.00917.40
7.4.140.0140.01017.86
7.4.130.0080.00916.46
7.4.120.0100.00616.56
7.4.110.0070.01016.41
7.4.100.0030.01416.36
7.4.90.0100.00616.50
7.4.80.0190.00319.39
7.4.70.0070.01016.59
7.4.60.0090.01216.57
7.4.50.0000.00816.20
7.4.40.0090.00616.41
7.4.30.0110.00516.45
7.4.00.0070.00715.05
7.3.330.0020.00213.02
7.3.320.0030.00313.00
7.3.310.0040.00416.24
7.3.300.0060.00016.17
7.3.290.0000.01516.16
7.3.280.0080.01116.20
7.3.270.0120.00617.40
7.3.260.0100.00716.38
7.3.250.0100.00816.40
7.3.240.0070.01016.36
7.3.230.0200.00316.39
7.3.210.0150.00316.51
7.3.200.0110.00519.39
7.3.190.0180.00316.36
7.3.180.0120.00316.42
7.3.170.0160.00316.38
7.3.160.0100.00716.48
7.2.330.0140.00316.70
7.2.320.0100.00716.28
7.2.310.0060.01616.46
7.2.300.0100.00716.21
7.2.290.0060.00916.63
7.2.00.0090.00619.41
7.1.100.0000.01317.88
7.1.70.0070.00417.09
7.1.60.0070.01619.61
7.1.50.0000.02016.85
7.1.00.0100.07022.48
7.0.200.0040.00416.67
7.0.140.0100.06022.21
7.0.60.0070.06320.06
7.0.50.0100.07717.90
7.0.40.0030.04720.05
7.0.30.0170.04720.20
7.0.20.0270.08020.33
7.0.10.0100.08320.16
7.0.00.0030.08020.12
5.6.280.0000.07720.89
5.6.210.0130.07320.74
5.6.200.0070.08018.09
5.6.190.0030.04320.67
5.6.180.0300.07320.39
5.6.170.0330.07020.54
5.6.160.0170.07320.48
5.6.150.0070.05318.21
5.6.140.0030.05718.18
5.6.130.0170.07318.15
5.6.120.0100.04020.89
5.6.110.0100.07721.02
5.6.100.0070.08321.01
5.6.90.0130.07721.12
5.6.80.0130.03020.35
5.5.350.0170.08720.40
5.5.340.0100.07717.89
5.5.330.0070.08020.37
5.5.320.0230.03720.24
5.5.310.0270.05720.31
5.5.300.0200.06717.95
5.5.290.0030.05017.98
5.5.280.0100.08020.87
5.5.270.0000.08020.78
5.5.260.0070.08020.68
5.5.250.0130.07320.79
5.5.240.4200.04020.28
5.4.450.0800.04719.41
5.4.440.0400.05019.41
5.4.430.0470.05019.54
5.4.420.0130.05019.54
5.4.410.0630.03719.35
5.4.400.0330.03719.22
5.4.390.0230.04319.15
5.4.380.0400.05718.73
5.4.370.0330.05018.60
5.4.360.0400.05018.73
5.4.350.0470.05018.48
5.4.340.0400.04018.73
5.4.320.0070.04112.46
5.4.310.0060.03912.45
5.4.300.0050.03812.46
5.4.290.0050.03912.45
5.4.280.0070.03412.35
5.4.270.0070.03612.35
5.4.260.0080.03712.35
5.4.250.0110.03312.35
5.4.240.0050.03912.35
5.4.230.0070.04012.34
5.4.220.0060.04612.34
5.4.210.0100.03112.34
5.4.200.0070.04312.34
5.4.190.0070.03512.34
5.4.180.0060.04512.34
5.4.170.0090.03512.35
5.4.160.0090.03712.35
5.4.150.0080.03612.34
5.4.140.0070.03512.03
5.4.130.0070.03512.01
5.4.120.0060.03611.97
5.4.110.0070.03511.97
5.4.100.0070.03711.97
5.4.90.0020.04111.96
5.4.80.0060.03711.96
5.4.70.0040.03711.96
5.4.60.0060.03511.96
5.4.50.0070.03411.96
5.4.40.0100.03011.95
5.4.30.0080.03511.95
5.4.20.0090.03511.95
5.4.10.0040.03711.95
5.4.00.0070.03411.44
5.3.290.0070.03912.80
5.3.280.0090.03612.70
5.3.270.0050.04812.73
5.3.260.0110.04812.72
5.3.250.0080.03612.72
5.3.240.0060.04212.72
5.3.230.0110.03512.71
5.3.220.0060.03812.68
5.3.210.0110.03812.68
5.3.200.0040.04012.68
5.3.190.0140.03212.68
5.3.180.0060.03812.68
5.3.170.0090.03512.67
5.3.160.0040.03912.67
5.3.150.0070.03612.67
5.3.140.0070.03612.66
5.3.130.0080.03812.66
5.3.120.0050.04012.66
5.3.110.0060.03912.66
5.3.100.0080.03512.12
5.3.90.0080.03512.08
5.3.80.0060.03712.07
5.3.70.0060.03712.07
5.3.60.0090.03612.06
5.3.50.0040.04012.00
5.3.40.0060.04312.00
5.3.30.0100.03111.94
5.3.20.0090.04111.73
5.3.10.0080.03911.69
5.3.00.0050.03811.68
5.2.170.0080.0279.18
5.2.160.0080.0269.18
5.2.150.0060.0369.17
5.2.140.0040.0339.18
5.2.130.0050.0299.14
5.2.120.0050.0299.13
5.2.110.0070.0319.14
5.2.100.0050.0309.14
5.2.90.0060.0289.14
5.2.80.0080.0289.13
5.2.70.0060.0329.14
5.2.60.0050.0379.09
5.2.50.0050.0309.05
5.2.40.0050.0309.04
5.2.30.0050.0319.01
5.2.20.0060.0289.00
5.2.10.0060.0288.92
5.2.00.0010.0328.77
5.1.60.0020.0268.07
5.1.50.0050.0248.06
5.1.40.0030.0258.04
5.1.30.0060.0248.39
5.1.20.0040.0278.41
5.1.10.0050.0288.14
5.1.00.0040.0278.14
5.0.50.0040.0216.62
5.0.40.0040.0196.48
5.0.30.0040.0316.29
5.0.20.0030.0206.26
5.0.10.0040.0196.24
5.0.00.0010.0336.23
4.4.90.0040.0144.78
4.4.80.0020.0154.75
4.4.70.0040.0134.75
4.4.60.0010.0164.75
4.4.50.0030.0144.77
4.4.40.0040.0234.71
4.4.30.0010.0174.76
4.4.20.0040.0144.84
4.4.10.0020.0194.85
4.4.00.0030.0244.76
4.3.110.0020.0164.67
4.3.100.0030.0184.66
4.3.90.0040.0134.63
4.3.80.0010.0254.59
4.3.70.0040.0134.63
4.3.60.0030.0144.63
4.3.50.0030.0154.63
4.3.40.0040.0234.54
4.3.30.0020.0153.28
4.3.20.0020.0153.26
4.3.10.0000.0173.21
4.3.00.0030.01713.57

preferences:
39.71 ms | 400 KiB | 5 Q