3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string)-1; for ($i = 0; $i < ($strLength / 2); $i++) { $substr1[] += $string[$strLength-$i]; $substr2[] += $string[$i]; } //var_dump($substr1); //var_dump($substr2); return $string = $substr1 + $substr2; } var_dump(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)
8.3.60.0140.00018.43
8.3.50.0190.00321.21
8.3.40.0070.01018.84
8.3.30.0120.00319.09
8.3.20.0080.00020.16
8.3.10.0050.00323.70
8.3.00.0000.00819.38
8.2.180.0120.00616.73
8.2.170.0070.00722.96
8.2.160.0100.01020.23
8.2.150.0070.00024.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0080.00022.18
8.2.110.0030.00620.36
8.2.100.0090.00318.09
8.2.90.0030.00519.14
8.2.80.0000.00817.97
8.2.70.0060.00317.50
8.2.60.0060.00317.93
8.2.50.0000.00818.07
8.2.40.0030.00520.01
8.2.30.0070.00018.03
8.2.20.0040.00417.79
8.2.10.0070.00018.04
8.2.00.0040.00417.70
8.1.280.0040.01225.92
8.1.270.0030.00621.99
8.1.260.0070.00026.35
8.1.250.0080.00028.09
8.1.240.0030.00623.71
8.1.230.0060.00619.09
8.1.220.0000.00917.79
8.1.210.0040.00418.77
8.1.200.0040.00417.22
8.1.190.0080.00017.25
8.1.180.0000.00718.10
8.1.170.0090.00018.50
8.1.160.0000.00721.96
8.1.150.0000.00718.85
8.1.140.0000.00717.39
8.1.130.0030.00517.89
8.1.120.0040.00417.39
8.1.110.0020.00517.37
8.1.100.0040.00417.43
8.1.90.0000.00717.41
8.1.80.0030.00317.36
8.1.70.0000.00717.35
8.1.60.0030.00617.61
8.1.50.0040.00417.57
8.1.40.0070.00017.44
8.1.30.0000.00817.59
8.1.20.0000.00817.55
8.1.10.0070.00017.51
8.1.00.0000.00717.59
8.0.300.0040.00418.77
8.0.290.0040.00416.75
8.0.280.0050.00318.39
8.0.270.0000.00717.27
8.0.260.0030.00317.18
8.0.250.0070.00017.09
8.0.240.0030.00316.99
8.0.230.0000.00716.90
8.0.220.0000.00716.98
8.0.210.0000.00716.97
8.0.200.0070.00017.00
8.0.190.0100.00016.95
8.0.180.0070.00016.82
8.0.170.0030.00516.93
8.0.160.0000.00716.91
8.0.150.0070.00016.84
8.0.140.0000.00816.88
8.0.130.0030.00313.34
8.0.120.0030.00616.85
8.0.110.0040.00416.91
8.0.100.0040.00416.94
8.0.90.0030.00416.84
8.0.80.0090.01216.89
8.0.70.0020.00516.90
8.0.60.0030.00516.95
8.0.50.0040.00416.82
8.0.30.0100.01117.01
8.0.20.0140.00617.40
8.0.10.0040.00417.07
8.0.00.0110.00616.71
7.4.330.0000.00515.02
7.4.320.0060.00316.56
7.4.300.0000.00616.52
7.4.290.0000.00716.50
7.4.280.0070.00016.42
7.4.270.0000.00716.52
7.4.260.0030.00316.57
7.4.250.0030.00516.49
7.4.240.0000.00716.55
7.4.230.0070.00016.42
7.4.220.0160.00616.62
7.4.210.0120.00316.64
7.4.200.0030.00316.69
7.4.160.0080.00816.52
7.4.150.0130.00617.40
7.4.140.0080.01117.86
7.4.130.0090.01116.79
7.4.120.0070.01216.47
7.4.110.0140.00516.58
7.4.100.0030.01716.55
7.4.90.0070.01116.62
7.4.80.0070.01119.39
7.4.70.0060.01116.71
7.4.60.0100.01016.43
7.4.50.0000.00816.56
7.4.40.0070.01516.60
7.4.30.0120.01216.57
7.4.00.0100.00914.93
7.3.330.0030.00313.44
7.3.320.0040.00413.39
7.3.310.0000.00716.39
7.3.300.0030.00316.44
7.3.290.0050.00916.42
7.3.280.0110.00716.42
7.3.270.0080.01117.40
7.3.260.0130.00316.56
7.3.250.0060.01116.58
7.3.240.0060.00916.38
7.3.230.0030.01316.48
7.3.210.0050.01416.43
7.3.200.0030.01319.39
7.3.190.0130.00716.52
7.3.180.0100.00616.59
7.3.170.0130.00916.40
7.3.160.0070.01016.51
7.3.120.0070.01114.93
7.3.110.0000.01715.00
7.3.100.0000.01414.94
7.3.90.0090.00914.85
7.3.80.0080.00314.80
7.3.70.0100.00714.98
7.3.60.0040.00814.94
7.3.50.0000.01514.67
7.3.40.0060.01214.66
7.3.30.0030.00614.74
7.3.20.0110.00616.84
7.3.10.0050.00716.76
7.3.00.0050.01016.60
7.2.330.0090.00916.53
7.2.320.0070.01116.92
7.2.310.0090.00916.82
7.2.300.0070.01016.79
7.2.290.0070.01416.69
7.2.250.0030.01114.95
7.2.240.0100.01014.95
7.2.230.0100.01015.35
7.2.220.0000.01614.86
7.2.210.0040.01515.20
7.2.200.0090.00614.94
7.2.190.0070.00315.17
7.2.180.0060.01315.04
7.2.170.0100.01015.07
7.2.130.0090.00916.63
7.2.120.0030.00716.91
7.2.110.0040.01216.77
7.2.100.0080.00816.96
7.2.90.0180.00317.03
7.2.80.0070.00317.04
7.2.70.0070.00717.01
7.2.60.0050.00617.00
7.2.50.0030.00916.90
7.2.40.0070.00717.02
7.2.30.0090.00916.94
7.2.20.0070.00716.96
7.2.10.0070.00417.02
7.2.00.0030.01117.99
7.1.330.0090.00615.76
7.1.320.0030.01015.58
7.1.310.0140.00315.68
7.1.300.0040.01115.68
7.1.290.0060.00915.91
7.1.280.0100.01015.95
7.1.270.0030.01015.93
7.1.260.0030.01015.58
7.1.250.0120.00015.97
7.1.200.0000.01015.83
7.1.100.0000.00818.05
7.1.70.0080.00817.21
7.1.60.0120.01219.11
7.1.50.0060.00617.01
7.1.00.0000.08022.32
7.0.200.0040.00416.58
7.0.140.0000.07722.09
7.0.60.0230.06719.98
7.0.50.0000.05717.89
7.0.40.0070.06320.11
7.0.30.0400.06720.34
7.0.20.0270.07320.33
7.0.10.0070.08720.10
7.0.00.0070.08720.22
5.6.280.0030.06720.89
5.6.210.0070.06720.48
5.6.200.0130.07718.22
5.6.190.0070.08320.59
5.6.180.0230.04320.39
5.6.170.0300.07020.47
5.6.160.0070.05320.55
5.6.150.0070.03718.19
5.6.140.0070.06718.15
5.6.130.0100.08018.18
5.6.120.0100.08021.00
5.6.110.0070.08321.02
5.6.100.0100.08020.96
5.6.90.0030.08720.88
5.6.80.0200.06020.54
5.6.70.4470.03720.37
5.5.350.0070.07720.42
5.5.340.0070.05718.08
5.5.330.0030.04320.27
5.5.320.0070.08320.34
5.5.310.0370.04320.36
5.5.300.0070.04017.96
5.5.290.0070.03717.99
5.5.280.0000.04320.76
5.5.270.0030.08720.98
5.5.260.0070.08020.95
5.5.250.0070.07720.75
5.5.240.0300.06720.16
5.4.450.0830.05719.57
5.4.440.0570.06019.16
5.4.430.0870.05719.38
5.4.420.0830.04319.39
5.4.410.0670.06019.34
5.4.400.0870.06019.29
5.4.390.0470.04719.29
5.4.380.0630.05719.01
5.4.370.0700.05319.27
5.4.360.0130.06019.24
5.4.350.0630.04719.35
5.4.340.0070.03412.02
5.4.320.0050.04212.50
5.4.310.0050.04012.50
5.4.300.0070.04312.50
5.4.290.0080.04312.50
5.4.280.0130.04712.40
5.4.270.0070.04512.40
5.4.260.0060.04312.40
5.4.250.0110.04412.40
5.4.240.0040.04612.39
5.4.230.0080.05312.39
5.4.220.0070.03612.39
5.4.210.0030.03812.39
5.4.200.0040.04712.39
5.4.190.0050.03812.39
5.4.180.0060.04112.39
5.4.170.0090.05012.39
5.4.160.0030.03912.39
5.4.150.0080.04312.39
5.4.140.0090.04812.07
5.4.130.0090.03212.06
5.4.120.0160.06812.02
5.4.110.0080.03812.01
5.4.100.0060.04112.01
5.4.90.0070.04412.01
5.4.80.0030.04312.01
5.4.70.0100.05012.00
5.4.60.0050.04012.01
5.4.50.0070.03912.01
5.4.40.0060.03612.00
5.4.30.0070.03511.99
5.4.20.0070.03512.00
5.4.10.0090.03411.99
5.4.00.0060.04011.48
5.3.290.0040.04312.80
5.3.280.0100.03512.70
5.3.270.0080.04012.72
5.3.260.0040.04312.72
5.3.250.0090.03512.72
5.3.240.0060.03912.72
5.3.230.0060.03912.71
5.3.220.0070.04112.68
5.3.210.0080.03812.68
5.3.200.0050.03812.68
5.3.190.0090.03512.68
5.3.180.0010.04412.67
5.3.170.0090.04012.67
5.3.160.0050.03912.68
5.3.150.0080.03712.67
5.3.140.0050.03912.66
5.3.130.0110.03612.66
5.3.120.0020.04412.66
5.3.110.0080.03812.66
5.3.100.0060.03812.12
5.3.90.0050.03912.10
5.3.80.0080.04112.09
5.3.70.0110.03712.09
5.3.60.0070.04212.08
5.3.50.0060.04112.02
5.3.40.0030.04512.02
5.3.30.0080.04311.98
5.3.20.0090.04011.76
5.3.10.0050.03711.73
5.3.00.0050.03811.71
5.2.170.0030.0329.22
5.2.160.0080.0299.21
5.2.150.0050.0319.21
5.2.140.0040.0329.21
5.2.130.0050.0349.18
5.2.120.0030.0309.17
5.2.110.0050.0329.18
5.2.100.0070.0269.18
5.2.90.0060.0279.17
5.2.80.0070.0379.17
5.2.70.0030.0359.17
5.2.60.0030.0349.13
5.2.50.0050.0329.09
5.2.40.0040.0319.07
5.2.30.0040.0309.05
5.2.20.0050.0289.04
5.2.10.0040.0288.94
5.2.00.0020.0318.80
5.1.60.0030.0298.08
5.1.50.0020.0278.08
5.1.40.0050.0248.06
5.1.30.0050.0308.41
5.1.20.0050.0278.43
5.1.10.0030.0278.16
5.1.00.0020.0278.16
5.0.50.0010.0236.64
5.0.40.0040.0196.50
5.0.30.0030.0326.31
5.0.20.0060.0256.27
5.0.10.0050.0186.26
5.0.00.0020.0366.25
4.4.90.0030.0214.78
4.4.80.0030.0214.76
4.4.70.0030.0174.75
4.4.60.0020.0174.76
4.4.50.0020.0164.77
4.4.40.0050.0244.71
4.4.30.0050.0144.76
4.4.20.0050.0144.84
4.4.10.0010.0174.85
4.4.00.0020.0264.76
4.3.110.0030.0164.66
4.3.100.0030.0154.66
4.3.90.0040.0194.63
4.3.80.0020.0274.58
4.3.70.0020.0174.63
4.3.60.0040.0194.62
4.3.50.0030.0224.63
4.3.40.0070.0274.54
4.3.30.0010.0173.30
4.3.20.0010.0173.28
4.3.10.0010.0173.24
4.3.00.0070.0236.88

preferences:
36.05 ms | 401 KiB | 5 Q