3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverseString($string) { $l = strlen($string)-1; for($i=0; $i<$l/2; $i++) { $string[$i] = $string[$i] ^ $string[$l-$i]; $string[$l-$i] = $string[$i] ^ $string[$l-$i]; $string[$i] = $string[$i] ^ $string[$l-$i]; } return $string; } var_dump(reverseString('foo'));

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)
8.3.60.0070.00716.38
8.3.50.0120.01022.01
8.3.40.0100.00718.78
8.3.30.0110.00319.08
8.3.20.0040.00420.34
8.3.10.0040.00423.35
8.3.00.0050.00319.50
8.2.180.0120.00918.41
8.2.170.0140.00022.96
8.2.160.0030.01020.53
8.2.150.0050.00324.18
8.2.140.0070.00024.66
8.2.130.0030.01426.16
8.2.120.0070.00022.27
8.2.110.0000.00820.53
8.2.100.0070.00417.91
8.2.90.0050.00319.36
8.2.80.0050.00318.05
8.2.70.0000.00817.50
8.2.60.0000.00817.93
8.2.50.0060.00318.07
8.2.40.0040.00419.85
8.2.30.0030.00618.23
8.2.20.0030.00617.63
8.2.10.0000.00819.90
8.2.00.0040.00417.81
8.1.280.0120.00325.92
8.1.270.0000.00820.37
8.1.260.0050.00326.35
8.1.250.0000.00728.09
8.1.240.0070.00323.77
8.1.230.0070.00420.84
8.1.220.0030.00517.79
8.1.210.0030.00618.77
8.1.200.0060.00317.35
8.1.190.0080.00017.52
8.1.180.0120.00018.10
8.1.170.0080.00018.43
8.1.160.0050.00322.06
8.1.150.0050.00518.56
8.1.140.0000.00717.55
8.1.130.0040.00417.74
8.1.120.0000.00717.50
8.1.110.0020.00517.32
8.1.100.0030.00317.36
8.1.90.0030.00317.46
8.1.80.0030.00317.52
8.1.70.0030.00317.38
8.1.60.0040.00417.59
8.1.50.0050.00317.41
8.1.40.0060.00317.51
8.1.30.0080.00017.60
8.1.20.0070.00017.66
8.1.10.0070.00017.46
8.1.00.0040.00417.50
8.0.300.0040.00418.77
8.0.290.0040.00417.04
8.0.280.0000.00718.36
8.0.270.0000.00717.26
8.0.260.0030.00317.28
8.0.250.0060.00016.97
8.0.240.0000.00716.93
8.0.230.0040.00416.86
8.0.220.0040.00416.86
8.0.210.0000.00816.91
8.0.200.0040.00417.02
8.0.190.0080.00017.00
8.0.180.0030.00716.84
8.0.170.0040.00416.91
8.0.160.0000.00816.72
8.0.150.0040.00316.89
8.0.140.0030.00316.82
8.0.130.0000.00613.35
8.0.120.0050.00316.79
8.0.110.0000.00716.87
8.0.100.0020.00516.77
8.0.90.0020.00516.79
8.0.80.0040.01116.87
8.0.70.0000.00716.74
8.0.60.0000.00716.89
8.0.50.0040.00416.71
8.0.30.0120.01116.97
8.0.20.0110.00817.40
8.0.10.0070.00016.91
8.0.00.0080.00916.83
7.4.330.0000.00515.00
7.4.320.0030.00316.55
7.4.300.0030.00316.42
7.4.290.0030.00316.55
7.4.280.0000.00716.59
7.4.270.0000.00716.62
7.4.260.0070.00016.48
7.4.250.0050.00316.61
7.4.240.0050.00216.54
7.4.230.0030.00316.53
7.4.220.0040.01516.37
7.4.210.0090.00716.56
7.4.200.0070.00016.71
7.4.190.0070.00016.78
7.4.160.0150.00316.64
7.4.150.0100.00717.40
7.4.140.0120.00517.86
7.4.130.0050.01316.47
7.4.120.0110.00616.48
7.4.110.0160.00716.50
7.4.100.0110.00916.64
7.4.90.0100.01016.57
7.4.80.0060.01219.39
7.4.70.0140.00316.63
7.4.60.0070.01716.52
7.4.50.0030.00516.29
7.4.40.0110.00422.77
7.4.30.0030.01416.54
7.4.00.0030.01314.97
7.3.330.0020.00213.36
7.3.320.0070.00013.43
7.3.310.0000.00716.39
7.3.300.0000.00716.23
7.3.290.0140.00516.32
7.3.280.0070.00816.35
7.3.270.0080.00817.40
7.3.260.0070.01016.28
7.3.250.0120.00816.45
7.3.240.0030.01416.72
7.3.230.0040.01216.39
7.3.210.0170.00016.47
7.3.200.0130.00919.39
7.3.190.0120.00616.30
7.3.180.0070.00716.28
7.3.170.0070.01016.28
7.3.160.0090.00916.37
7.3.120.0030.01014.85
7.2.330.0100.01016.68
7.2.320.0120.00616.74
7.2.310.0090.00916.52
7.2.300.0160.00516.72
7.2.290.0100.01016.57
7.2.00.0040.01119.50
7.1.200.0030.01015.70
7.1.100.0320.00416.04
7.1.70.0030.01017.25
7.1.60.0090.00317.41
7.1.50.0070.01816.68
7.1.00.0030.07722.24
7.0.200.0030.01316.84
7.0.140.0100.06721.95
7.0.60.0100.06720.03
7.0.50.0070.07717.86
7.0.40.0100.08320.13
7.0.30.0200.05020.16
7.0.20.0370.08020.33
7.0.10.0230.08320.07
7.0.00.0070.04020.16
5.6.280.0130.06321.13
5.6.210.0070.05320.61
5.6.200.0170.07018.16
5.6.190.0070.08720.55
5.6.180.0170.05320.55
5.6.170.0200.05320.45
5.6.160.0030.05020.52
5.6.150.0030.04018.21
5.6.140.0170.06718.24
5.6.130.0070.08018.24
5.6.120.0100.06021.00
5.6.110.0100.03721.12
5.6.100.0070.04721.02
5.6.90.0130.08721.02
5.6.80.0070.06020.43
5.6.70.0030.04720.40
5.5.350.0030.08320.43
5.5.340.0000.04017.98
5.5.330.0100.07020.29
5.5.320.0230.05320.27
5.5.310.0330.05720.27
5.5.300.0070.06017.95
5.5.290.0030.08317.98
5.5.280.0070.08320.69
5.5.270.0100.07320.86
5.5.260.0100.08320.76
5.5.250.0070.03720.61
5.5.240.0070.06020.26
5.4.450.0530.06319.47
5.4.440.0630.06319.45
5.4.430.0370.05319.18
5.4.420.0570.05019.46
5.4.410.0400.07019.49
5.4.400.0730.07719.01
5.4.390.0730.05718.87
5.4.380.0570.03718.71
5.4.370.0200.06018.69
5.4.360.0230.05018.79
5.4.350.0300.06018.81
5.4.340.0400.07018.61
5.4.320.0090.03412.50
5.4.310.0090.03912.50
5.4.300.0100.03912.51
5.4.290.0030.04712.49
5.4.280.0050.03812.38
5.4.270.0030.04012.38
5.4.260.0080.03612.38
5.4.250.0090.04612.38
5.4.240.0050.04012.38
5.4.230.0070.04012.37
5.4.220.0100.03312.38
5.4.210.0040.03812.38
5.4.200.0070.05012.37
5.4.190.0040.04512.38
5.4.180.0060.03812.38
5.4.170.0070.03712.38
5.4.160.0090.03612.38
5.4.150.0060.03912.37
5.4.140.0060.04012.05
5.4.130.0040.04612.04
5.4.120.0070.03812.00
5.4.110.0040.04111.99
5.4.100.0090.03612.00
5.4.90.0070.03911.99
5.4.80.0080.04012.00
5.4.70.0050.04212.00
5.4.60.0060.03511.99
5.4.50.0090.03311.99
5.4.40.0040.03611.98
5.4.30.0090.03311.98
5.4.20.0050.03611.98
5.4.10.0040.03811.98
5.4.00.0120.05711.46
5.3.290.0110.04312.80
5.3.280.0120.04212.71
5.3.270.0080.03912.72
5.3.260.0070.03912.72
5.3.250.0030.04112.72
5.3.240.0020.04312.72
5.3.230.0050.04012.71
5.3.220.0080.03612.68
5.3.210.0070.04012.68
5.3.200.0080.05012.68
5.3.190.0090.05212.68
5.3.180.0120.04212.67
5.3.170.0090.04812.67
5.3.160.0150.04412.67
5.3.150.0070.05312.67
5.3.140.0080.05012.66
5.3.130.0050.05512.66
5.3.120.0080.05112.66
5.3.110.0110.04812.66
5.3.100.0070.04812.12
5.3.90.0060.05212.10
5.3.80.0070.04912.09
5.3.70.0060.05012.09
5.3.60.0060.04912.08
5.3.50.0110.04512.02
5.3.40.0090.04512.02
5.3.30.0080.04911.98
5.3.20.0090.05111.76
5.3.10.0070.05311.73
5.3.00.0120.06011.72
5.2.170.0090.0449.21
5.2.160.0080.0369.21
5.2.150.0080.0389.21
5.2.140.0050.0329.21
5.2.130.0040.0329.17
5.2.120.0050.0299.17
5.2.110.0040.0409.18
5.2.100.0090.0329.17
5.2.90.0060.0369.18
5.2.80.0010.0349.17
5.2.70.0080.0279.17
5.2.60.0050.0299.13
5.2.50.0060.0309.09
5.2.40.0070.0289.07
5.2.30.0060.0329.05
5.2.20.0060.0399.04
5.2.10.0070.0388.94
5.2.00.0040.0318.80
5.1.60.0040.0288.09
5.1.50.0070.0288.08
5.1.40.0080.0308.06
5.1.30.0070.0348.41
5.1.20.0080.0288.43
5.1.10.0040.0348.16
5.1.00.0080.0368.16
5.0.50.0050.0286.64
5.0.40.0040.0276.51
5.0.30.0050.0396.32
5.0.20.0080.0216.29
5.0.10.0040.0206.27
5.0.00.0050.0366.27
4.4.90.0040.0264.78
4.4.80.0080.0164.76
4.4.70.0030.0194.75
4.4.60.0050.0174.76
4.4.50.0020.0164.77
4.4.40.0030.0254.71
4.4.30.0020.0174.76
4.4.20.0040.0164.85
4.4.10.0050.0144.85
4.4.00.0020.0264.76
4.3.110.0020.0174.67
4.3.100.0030.0164.67
4.3.90.0030.0164.63
4.3.80.0040.0254.58
4.3.70.0030.0164.63
4.3.60.0050.0144.63
4.3.50.0020.0184.63
4.3.40.0050.0244.53
4.3.30.0040.0223.30
4.3.20.0030.0173.28
4.3.10.0010.0183.24
4.3.00.0170.02310.54

preferences:
46.25 ms | 400 KiB | 5 Q