3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; for ($i = 0; $i < (strlen($string) / 2 -1); $i++) { $substr1 += $string[strlen($string)-$i]; $substr2 += $string[$i]; } return $string = $substr1 + $substr2; } reverse('12345');

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)
8.3.40.0090.00618.98
8.3.30.0130.00319.18
8.3.20.0080.00020.34
8.3.10.0000.00923.83
8.3.00.0060.00319.50
8.2.170.0160.00722.96
8.2.160.0120.00420.47
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0000.00826.16
8.2.120.0030.00622.30
8.2.110.0000.00920.35
8.2.100.0090.00318.16
8.2.90.0000.00719.39
8.2.80.0040.00417.97
8.2.70.0060.00317.75
8.2.60.0040.00417.93
8.2.50.0090.00018.07
8.2.40.0080.00019.91
8.2.30.0000.00718.08
8.2.20.0030.00517.81
8.2.10.0070.00018.00
8.2.00.0040.00417.75
8.1.270.0040.00422.14
8.1.260.0030.00526.35
8.1.250.0040.00428.09
8.1.240.0030.00624.04
8.1.230.0090.00319.09
8.1.220.0030.00517.79
8.1.210.0040.00418.77
8.1.200.0000.00917.35
8.1.190.0040.00417.35
8.1.180.0080.00018.10
8.1.170.0030.00918.71
8.1.160.0040.00421.86
8.1.150.0000.00718.87
8.1.140.0000.00717.35
8.1.130.0040.00417.84
8.1.120.0000.00717.38
8.1.110.0080.00017.29
8.1.100.0040.00417.29
8.1.90.0000.00717.40
8.1.80.0020.00517.29
8.1.70.0040.00417.35
8.1.60.0060.00317.54
8.1.50.0040.00417.54
8.1.40.0000.00817.50
8.1.30.0080.00017.66
8.1.20.0000.00717.55
8.1.10.0000.00717.47
8.1.00.0070.00017.55
8.0.300.0000.00818.77
8.0.290.0000.00716.75
8.0.280.0000.00718.45
8.0.270.0000.00717.18
8.0.260.0040.00417.21
8.0.250.0030.00316.93
8.0.240.0040.00416.96
8.0.230.0000.00717.06
8.0.220.0030.00316.88
8.0.210.0030.00316.94
8.0.200.0000.00716.88
8.0.190.0050.00316.87
8.0.180.0030.00316.91
8.0.170.0030.00516.82
8.0.160.0000.00816.81
8.0.150.0040.00416.79
8.0.140.0040.00416.86
8.0.130.0030.00313.34
8.0.120.0040.00416.85
8.0.110.0000.00716.79
8.0.100.0030.00516.96
8.0.90.0040.00416.95
8.0.80.0030.01316.95
8.0.70.0000.00716.87
8.0.60.0040.00416.77
8.0.50.0080.00016.91
8.0.30.0110.01116.97
8.0.20.0130.00917.40
8.0.10.0080.00016.89
8.0.00.0070.01016.74
7.4.330.0000.00515.02
7.4.320.0050.00516.55
7.4.300.0060.00016.63
7.4.290.0040.00416.61
7.4.280.0000.00716.59
7.4.270.0070.00016.61
7.4.260.0000.00716.48
7.4.250.0000.00716.43
7.4.240.0030.00516.58
7.4.230.0030.00316.66
7.4.220.0070.01016.46
7.4.210.0120.00416.60
7.4.200.0050.00216.41
7.4.160.0100.00716.59
7.4.150.0100.00817.40
7.4.140.0090.01217.86
7.4.130.0130.00316.59
7.4.120.0150.00316.56
7.4.110.0120.01116.56
7.4.100.0110.00616.57
7.4.90.0140.00316.71
7.4.80.0090.00919.39
7.4.70.0130.00316.70
7.4.60.0100.00716.47
7.4.50.0030.00516.72
7.4.40.0060.00916.70
7.4.30.0120.00616.51
7.4.00.0070.01014.93
7.3.330.0030.00313.28
7.3.320.0000.00713.23
7.3.310.0030.00316.41
7.3.300.0030.00316.39
7.3.290.0090.00716.38
7.3.280.0050.01116.38
7.3.270.0100.00717.40
7.3.260.0080.00816.47
7.3.250.0060.01116.58
7.3.240.0110.01116.53
7.3.230.0130.00316.46
7.3.210.0090.00916.75
7.3.200.0120.00319.39
7.3.190.0080.01516.42
7.3.180.0080.00816.52
7.3.170.0100.00716.43
7.3.160.0140.00416.51
7.3.10.0030.00616.39
7.3.00.0080.00816.64
7.2.330.0100.00716.57
7.2.320.0090.00916.87
7.2.310.0100.00616.43
7.2.300.0040.01116.50
7.2.290.0100.01216.42
7.2.130.0070.00416.80
7.2.120.0040.00716.98
7.2.110.0110.00016.68
7.2.100.0110.00417.02
7.2.90.0000.01417.01
7.2.80.0150.00016.78
7.2.70.0030.00716.64
7.2.60.0060.00517.03
7.2.50.0030.01217.02
7.2.40.0000.00916.80
7.2.30.0030.00917.03
7.2.20.0060.00616.75
7.2.10.0040.00716.66
7.2.00.0060.00618.00
7.1.250.0070.00315.46
7.1.200.0080.00315.91
7.1.100.0040.00818.15
7.1.70.0080.00617.14
7.1.60.0180.00719.11
7.1.50.0070.01616.64
7.1.00.0030.07722.38
7.0.200.0100.00016.90
7.0.140.0030.07721.98
7.0.60.0130.07319.84
7.0.50.0130.06717.84
7.0.40.0200.03320.21
7.0.30.0270.08020.10
7.0.20.0300.08020.06
7.0.10.0070.07020.16
7.0.00.0070.04320.09
5.6.280.0030.07020.88
5.6.210.0130.06720.77
5.6.200.0070.08718.28
5.6.190.0070.07720.61
5.6.180.0270.06320.61
5.6.170.0200.05720.39
5.6.160.0270.04320.48
5.6.150.0130.07018.29
5.6.140.0030.08318.15
5.6.130.0070.08718.21
5.6.120.0200.07021.15
5.6.110.0000.05021.09
5.6.100.0130.07021.04
5.6.90.0100.08321.00
5.6.80.0000.04720.51
5.5.350.4270.03320.47
5.5.340.0030.08717.99
5.5.330.0000.05320.43
5.5.320.0370.06320.24
5.5.310.0230.06720.35
5.5.300.0130.06718.07
5.5.290.0030.07018.04
5.5.280.0170.07720.98
5.5.270.0130.07720.78
5.5.260.0170.07320.79
5.5.250.0100.08720.77
5.5.240.0070.08720.13
5.4.450.0670.07319.63
5.4.440.0600.05019.48
5.4.430.0630.06019.59
5.4.420.0800.05719.40
5.4.410.0670.04719.32
5.4.400.0670.04319.34
5.4.390.0670.07019.24
5.4.380.0630.05719.01
5.4.370.0700.05019.12
5.4.360.0570.05319.22
5.4.350.0870.05319.34
5.4.340.0070.03512.02
5.4.320.0090.03412.51
5.4.310.0070.03812.50
5.4.300.0060.03812.50
5.4.290.0070.04012.50
5.4.280.0040.03912.39
5.4.270.0070.03512.40
5.4.260.0070.03712.39
5.4.250.0080.03712.39
5.4.240.0080.03412.40
5.4.230.0040.03912.39
5.4.220.0080.03412.39
5.4.210.0070.03512.39
5.4.200.0080.03712.39
5.4.190.0090.03312.39
5.4.180.0080.03312.38
5.4.170.0080.03412.39
5.4.160.0050.03612.39
5.4.150.0040.03812.39
5.4.140.0070.04612.07
5.4.130.0060.03712.06
5.4.120.0030.04212.01
5.4.110.0050.03612.01
5.4.100.0040.03812.01
5.4.90.0070.03612.01
5.4.80.0050.03812.01
5.4.70.0060.03512.01
5.4.60.0050.03612.00
5.4.50.0080.03312.01
5.4.40.0040.03612.00
5.4.30.0100.03312.00
5.4.20.0040.03712.00
5.4.10.0030.03812.00
5.4.00.0050.03711.48
5.3.290.0050.04712.80
5.3.280.0060.03712.71
5.3.270.0080.03612.73
5.3.260.0070.03812.71
5.3.250.0050.03712.72
5.3.240.0060.03612.72
5.3.230.0040.04012.70
5.3.220.0070.03712.68
5.3.210.0020.04412.68
5.3.200.0070.03612.68
5.3.190.0100.04212.68
5.3.180.0060.03812.68
5.3.170.0060.03612.67
5.3.160.0080.05012.68
5.3.150.0110.04912.68
5.3.140.0150.04412.66
5.3.130.0080.05312.66
5.3.120.0110.05112.65
5.3.110.0100.03912.66
5.3.100.0070.04812.11
5.3.90.0100.04912.10
5.3.80.0130.04512.09
5.3.70.0100.04712.09
5.3.60.0070.03812.07
5.3.50.0060.03612.02
5.3.40.0060.03612.02
5.3.30.0060.03411.98
5.3.20.0070.03511.76
5.3.10.0110.03711.73
5.3.00.0110.05611.71
5.2.170.0130.0919.21
5.2.160.0090.0349.21
5.2.150.0080.0369.21
5.2.140.0090.0359.21
5.2.130.0100.0369.17
5.2.120.0060.0309.17
5.2.110.0030.0319.18
5.2.100.0050.0299.17
5.2.90.0030.0319.18
5.2.80.0100.0339.17
5.2.70.0060.0329.16
5.2.60.0060.0329.13
5.2.50.0030.0349.09
5.2.40.0090.0259.07
5.2.30.0060.0309.05
5.2.20.0070.0319.03
5.2.10.0030.0328.95
5.2.00.0040.0308.80
5.1.60.0020.0258.08
5.1.50.0050.0248.08
5.1.40.0060.0228.06
5.1.30.0030.0318.41
5.1.20.0030.0308.43
5.1.10.0030.0308.16
5.1.00.0020.0318.16
5.0.50.0020.0236.64
5.0.40.0000.0226.50
5.0.30.0030.0326.31
5.0.20.0040.0196.27
5.0.10.0010.0226.25
5.0.00.0020.0316.25
4.4.90.0020.0164.78
4.4.80.0050.0134.76
4.4.70.0040.0184.75
4.4.60.0030.0174.75
4.4.50.0030.0154.77
4.4.40.0020.0264.71
4.4.30.0010.0204.76
4.4.20.0030.0204.84
4.4.10.0040.0214.85
4.4.00.0040.0264.76
4.3.110.0050.0144.67
4.3.100.0070.0154.66
4.3.90.0030.0174.63
4.3.80.0030.0244.58
4.3.70.0030.0144.63
4.3.60.0030.0144.62
4.3.50.0040.0144.63
4.3.40.0040.0274.54
4.3.30.0040.0173.30
4.3.20.0010.0183.28
4.3.10.0030.0163.24
4.3.00.0100.0207.07

preferences:
47.32 ms | 400 KiB | 5 Q