3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array("one" => 1, "two" => 2); reset($a); $firstKey = key($a); echo $firstKey . "\n";

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)
8.3.70.0100.01016.25
8.3.60.0140.00718.55
8.3.50.0110.00821.98
8.3.40.0070.00718.71
8.3.30.0070.00718.84
8.3.20.0050.00320.16
8.3.10.0080.00021.96
8.3.00.0050.00322.44
8.2.190.0040.01116.75
8.2.180.0150.00316.38
8.2.170.0140.00022.96
8.2.160.0140.00320.77
8.2.150.0040.00424.18
8.2.140.0080.00024.66
8.2.130.0000.00826.16
8.2.120.0040.00419.91
8.2.110.0090.00020.38
8.2.100.0060.00619.45
8.2.90.0060.00319.02
8.2.80.0030.00618.04
8.2.70.0060.00317.50
8.2.60.0070.00417.93
8.2.50.0030.00518.07
8.2.40.0030.00518.16
8.2.30.0030.00518.05
8.2.20.0050.00217.52
8.2.10.0040.00417.78
8.2.00.0000.00717.73
8.1.280.0070.01425.92
8.1.270.0040.00422.07
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0030.00623.84
8.1.230.0050.00518.98
8.1.220.0050.00317.74
8.1.210.0000.00818.77
8.1.200.0060.00317.11
8.1.190.0030.00617.30
8.1.180.0080.00018.65
8.1.170.0040.00418.43
8.1.160.0040.00421.98
8.1.150.0050.00218.55
8.1.140.0060.00317.29
8.1.130.0030.00517.78
8.1.120.0070.00017.43
8.1.110.0070.00017.39
8.1.100.0070.00017.44
8.1.90.0050.00317.34
8.1.80.0000.00717.26
8.1.70.0040.00417.35
8.1.60.0040.00417.43
8.1.50.0050.00317.36
8.1.40.0000.00717.33
8.1.30.0030.00517.46
8.1.20.0050.00317.62
8.1.10.0040.00417.47
8.1.00.0000.00817.29
8.0.300.0000.00718.77
8.0.290.0070.00017.05
8.0.280.0000.00818.35
8.0.270.0050.00317.15
8.0.260.0000.00616.79
8.0.250.0070.00016.82
8.0.240.0090.00016.88
8.0.230.0030.00317.00
8.0.220.0000.00716.76
8.0.210.0030.00316.92
8.0.200.0030.00316.89
8.0.190.0000.00816.96
8.0.180.0040.00416.93
8.0.170.0000.00716.76
8.0.160.0000.00716.86
8.0.150.0040.00416.84
8.0.140.0000.00816.80
8.0.130.0060.00013.32
8.0.120.0030.00516.84
8.0.110.0050.00216.78
8.0.100.0000.00716.89
8.0.90.0000.00716.71
8.0.80.0000.01416.85
8.0.70.0040.00416.70
8.0.60.0040.00416.85
8.0.50.0030.00516.72
8.0.30.0080.01516.98
8.0.20.0110.00817.40
8.0.10.0040.00416.87
8.0.00.0100.01016.67
7.4.330.0020.00215.00
7.4.320.0060.00016.58
7.4.300.0030.00316.38
7.4.290.0050.00216.43
7.4.280.0000.00616.50
7.4.270.0000.00716.45
7.4.260.0070.00016.55
7.4.250.0050.00216.38
7.4.240.0030.00416.52
7.4.230.0000.00716.22
7.4.220.0120.00616.59
7.4.210.0010.01316.53
7.4.200.0030.00316.55
7.4.190.0070.00016.60
7.4.160.0110.00816.50
7.4.150.0080.00817.40
7.4.140.0200.01217.86
7.4.130.0090.00916.39
7.4.120.0080.01016.47
7.4.110.0040.01516.43
7.4.100.0170.00716.48
7.4.90.0140.01016.45
7.4.80.0080.01319.39
7.4.70.0130.00816.42
7.4.60.0090.00616.33
7.4.50.0000.00816.13
7.4.40.0090.00922.77
7.4.30.0080.00816.61
7.4.00.0100.00714.58
7.3.330.0030.00313.03
7.3.320.0000.00513.03
7.3.310.0050.00416.18
7.3.300.0060.00016.13
7.3.290.0100.01516.17
7.3.280.0120.00716.22
7.3.270.0150.00917.40
7.3.260.0100.00616.14
7.3.250.0130.00416.44
7.3.240.0030.01316.18
7.3.230.0100.01316.39
7.3.210.0130.00716.46
7.3.200.0130.00916.32
7.3.190.0150.00616.31
7.3.180.0090.00616.18
7.3.170.0090.00616.27
7.3.160.0070.01016.49
7.3.120.0040.01214.87
7.3.10.0000.01516.43
7.3.00.0120.00016.47
7.2.330.0070.01016.44
7.2.320.0060.00916.35
7.2.310.0070.01116.68
7.2.300.0090.01216.27
7.2.290.0120.00916.44
7.2.130.0030.01216.93
7.2.120.0070.01016.78
7.2.110.0120.00316.93
7.2.100.0090.00616.85
7.2.90.0060.00917.00
7.2.80.0040.01116.87
7.2.70.0040.01117.05
7.2.60.0060.01016.83
7.2.50.0030.00916.75
7.2.40.0110.00316.98
7.2.30.0080.00417.05
7.2.20.0040.00816.84
7.2.10.0040.01217.01
7.2.00.0050.00918.27
7.1.250.0060.00615.81
7.1.200.0060.00915.86
7.1.100.0030.00917.82
7.1.70.0040.00417.19
7.1.60.0130.00619.82
7.1.50.0060.01316.90
7.1.00.0030.08022.43
7.0.200.0110.00016.65
7.0.140.0030.07321.98
7.0.60.0070.05720.03
7.0.50.0130.02717.80
7.0.40.0070.06720.07
7.0.30.0530.07320.09
7.0.20.0270.08020.13
7.0.10.0130.07320.21
7.0.00.0070.06319.99
5.6.210.0100.05720.46
5.6.200.0070.04018.16
5.6.190.0070.05320.43
5.6.180.0770.06720.35
5.6.170.0200.07320.52
5.6.160.0070.05020.70
5.6.150.0100.08018.18
5.6.140.0070.07718.12
5.6.130.0070.08718.21
5.6.120.0070.08321.00
5.6.110.0100.06021.00
5.6.100.0070.08021.02
5.6.90.0070.04021.09
5.6.80.0270.05320.38
5.5.350.0070.04320.43
5.5.340.0100.06317.88
5.5.330.0000.04320.07
5.5.320.0000.04320.26
5.5.310.0370.07020.29
5.5.300.0070.03717.88
5.5.290.0200.06017.91
5.5.280.0130.08020.96
5.5.270.0030.05720.82
5.5.260.0070.08320.94
5.5.250.0000.04720.69
5.5.240.0000.07720.06
5.4.450.0230.03719.46
5.4.440.0270.06719.45
5.4.430.0170.05019.49
5.4.420.0070.06019.16
5.4.410.0100.05319.34
5.4.400.1870.00018.66
5.4.390.1500.00018.50
5.4.380.0230.06018.74
5.4.370.0230.05318.58
5.4.360.0230.05318.53
5.4.350.0300.04718.57
5.4.340.0400.05718.61
5.4.320.0030.04212.45
5.4.310.0110.03712.45
5.4.300.0070.03912.45
5.4.290.0080.03412.45
5.4.280.0090.03612.34
5.4.270.0070.03412.35
5.4.260.0170.04018.87
5.4.250.0070.05018.86
5.4.240.0100.05019.03
5.4.230.0100.05719.01
5.4.220.0200.05718.91
5.4.210.0130.04718.99
5.4.200.0230.04718.73
5.4.190.0030.06018.91
5.4.180.0030.07018.68
5.4.170.0130.04718.64
5.4.160.0130.04318.89
5.4.150.0130.05018.87
5.4.140.0100.04716.35
5.4.130.0070.05316.48
5.4.120.0030.05016.29
5.4.110.0030.05316.23
5.4.100.0070.05016.34
5.4.90.0100.06316.36
5.4.80.0170.04316.33
5.4.70.0170.05016.27
5.4.60.0070.05016.42
5.4.50.0070.04716.41
5.4.40.0130.04016.37
5.4.30.0070.04716.41
5.4.20.0030.05316.23
5.4.10.0100.07316.43
5.4.00.0070.05015.88
5.3.290.0070.03712.80
5.3.280.0030.05714.60
5.3.270.0100.07014.70
5.3.260.0130.07314.44
5.3.250.0030.05314.31
5.3.240.0030.05314.30
5.3.230.0130.04314.69
5.3.220.0100.04714.56
5.3.210.0030.07714.41
5.3.200.0100.05314.63
5.3.190.0100.04714.57
5.3.180.0030.05314.41
5.3.170.0100.05014.55
5.3.160.0030.05314.40
5.3.150.0100.05014.43
5.3.140.0100.05014.25
5.3.130.0130.04714.40
5.3.120.0100.06014.56
5.3.110.0100.06014.56
5.3.100.0030.05714.05
5.3.90.0070.05014.02
5.3.80.0130.04314.01
5.3.70.0070.05014.03

preferences:
45.49 ms | 401 KiB | 5 Q