3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string); //$strLengthHalf = round($strLength / 2); for ($i = 0; $i < $strLengthHalf = round($strLength / 2); $i++) { var_dump($strLength-$i); var_dump($strLengthHalf - $i); $substr1 .= $string[$strLength-$i]; $substr2 .= $string[$strLengthHalf - $i]; } //var_dump($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)
8.3.60.0000.01418.55
8.3.50.0100.00821.22
8.3.40.0140.00418.82
8.3.30.0070.00719.07
8.3.20.0000.00720.36
8.3.10.0120.00623.59
8.3.00.0080.00019.51
8.2.180.0090.00618.64
8.2.170.0110.00422.96
8.2.160.0070.00720.46
8.2.150.0040.00424.18
8.2.140.0030.00524.66
8.2.130.0070.00026.16
8.2.120.0020.00522.18
8.2.110.0100.00022.24
8.2.100.0060.00617.88
8.2.90.0040.00419.17
8.2.80.0040.00417.97
8.2.70.0060.00317.75
8.2.60.0000.01118.18
8.2.50.0000.00918.07
8.2.40.0000.00819.97
8.2.30.0000.00718.05
8.2.20.0000.00717.80
8.2.10.0070.00018.07
8.2.00.0040.00417.89
8.1.280.0090.00625.92
8.1.270.0040.00424.00
8.1.260.0090.00026.35
8.1.250.0040.00428.09
8.1.240.0140.00324.09
8.1.230.0080.00419.38
8.1.220.0000.00817.77
8.1.210.0060.00318.77
8.1.200.0060.00317.25
8.1.190.0080.00017.35
8.1.180.0070.00018.10
8.1.170.0090.00318.45
8.1.160.0040.00422.00
8.1.150.0030.00518.94
8.1.140.0030.00617.44
8.1.130.0030.00317.76
8.1.120.0030.00317.43
8.1.110.0050.00317.41
8.1.100.0000.00717.45
8.1.90.0040.00417.48
8.1.80.0030.00417.45
8.1.70.0030.00317.33
8.1.60.0030.00517.59
8.1.50.0040.00417.56
8.1.40.0080.00017.50
8.1.30.0040.00417.73
8.1.20.0040.00417.68
8.1.10.0040.00417.63
8.1.00.0070.00017.55
8.0.300.0040.00418.77
8.0.290.0000.00716.88
8.0.280.0030.00318.43
8.0.270.0000.00716.96
8.0.260.0070.00017.31
8.0.250.0000.00817.00
8.0.240.0030.00317.06
8.0.230.0030.00317.03
8.0.220.0030.00317.02
8.0.210.0040.00416.99
8.0.200.0040.00416.96
8.0.190.0030.00517.07
8.0.180.0050.00217.00
8.0.170.0000.00817.03
8.0.160.0000.00716.97
8.0.150.0000.00716.91
8.0.140.0080.00016.93
8.0.130.0000.00513.40
8.0.120.0040.00416.96
8.0.110.0000.00716.93
8.0.100.0050.00217.00
8.0.90.0000.00716.98
8.0.80.0090.01516.96
8.0.70.0040.00416.89
8.0.60.0040.00417.04
8.0.50.0000.00716.82
8.0.30.0130.01017.19
8.0.20.0130.00617.40
8.0.10.0040.00417.05
8.0.00.0130.00516.86
7.4.330.0060.00015.15
7.4.320.0090.00016.48
7.4.300.0000.00616.44
7.4.290.0030.00316.54
7.4.280.0000.00716.59
7.4.270.0000.00716.66
7.4.260.0040.00416.53
7.4.250.0040.00416.52
7.4.240.0020.00616.53
7.4.230.0000.00716.56
7.4.220.0180.00316.62
7.4.210.0090.01016.58
7.4.200.0030.00516.55
7.4.160.0060.01016.63
7.4.150.0070.01017.40
7.4.140.0140.00917.86
7.4.130.0060.01316.61
7.4.120.0070.01316.57
7.4.110.0110.00816.60
7.4.100.0120.00416.63
7.4.90.0030.01416.57
7.4.80.0120.01119.39
7.4.70.0040.01416.72
7.4.60.0060.01216.61
7.4.50.0040.00416.51
7.4.40.0100.00716.37
7.4.30.0080.00816.69
7.4.00.0000.01514.82
7.3.330.0000.00613.27
7.3.320.0030.00313.31
7.3.310.0000.00716.49
7.3.300.0040.00416.38
7.3.290.0100.00816.49
7.3.280.0070.01016.48
7.3.270.0100.01017.40
7.3.260.0090.01216.59
7.3.250.0060.01016.43
7.3.240.0040.01316.50
7.3.230.0100.00716.59
7.3.210.0070.01016.48
7.3.200.0110.00619.39
7.3.190.0070.01016.72
7.3.180.0090.00616.62
7.3.170.0060.01516.65
7.3.160.0060.00916.48
7.2.330.0090.00916.86
7.2.320.0070.01416.77
7.2.310.0160.00016.86
7.2.300.0060.01516.59
7.2.290.0070.01516.91
7.2.00.0130.00419.23
7.1.100.0040.00417.98
7.1.70.0040.00417.16
7.1.60.0110.01519.11
7.1.50.0070.01417.05
7.1.00.0070.07322.28
7.0.200.0040.00416.59
7.0.140.0000.07722.06
7.0.60.0100.08319.89
7.0.50.0000.06717.88
7.0.40.0100.04020.11
7.0.30.0300.07020.27
7.0.20.0300.07320.07
7.0.10.0200.03720.26
7.0.00.0070.07320.22
5.6.280.0030.07320.82
5.6.210.0070.04320.63
5.6.200.0070.07318.29
5.6.190.0130.07320.34
5.6.180.0370.06020.39
5.6.170.0270.06320.47
5.6.160.0130.07720.71
5.6.150.0270.03018.18
5.6.140.0030.04318.18
5.6.130.0000.08718.18
5.6.120.0130.07021.02
5.6.110.0000.09021.00
5.6.100.0000.04321.11
5.6.90.0230.07320.99
5.6.80.0100.08020.51
5.6.70.3130.03720.48
5.5.350.0030.08020.31
5.5.340.0070.08018.05
5.5.330.0070.08320.40
5.5.320.0430.07020.30
5.5.310.0270.07720.23
5.5.300.0100.08017.99
5.5.290.0030.04317.96
5.5.280.0030.05720.89
5.5.270.0030.04320.75
5.5.260.0000.06320.79
5.5.250.0070.08320.55
5.5.240.0370.05720.16
5.4.450.0600.06019.74
5.4.440.0630.06319.65
5.4.430.0570.06019.62
5.4.420.0670.05019.62
5.4.410.0770.04319.34
5.4.400.0670.05319.15
5.4.390.0830.05019.41
5.4.380.0270.04719.25
5.4.370.0670.06719.29
5.4.360.0730.05019.11
5.4.350.0900.05719.15
5.4.340.0070.03512.02
5.4.320.0050.03812.51
5.4.310.0070.03712.51
5.4.300.0060.03712.51
5.4.290.0020.04612.50
5.4.280.0060.03612.40
5.4.270.0050.04012.40
5.4.260.0050.03812.40
5.4.250.0090.03712.40
5.4.240.0060.04512.40
5.4.230.0060.04112.39
5.4.220.0090.03712.39
5.4.210.0050.03912.39
5.4.200.0150.03412.39
5.4.190.0090.03712.39
5.4.180.0070.03512.39
5.4.170.0060.03712.40
5.4.160.0060.03612.39
5.4.150.0090.03312.39
5.4.140.0020.04112.07
5.4.130.0070.03412.07
5.4.120.0030.03912.02
5.4.110.0060.03612.02
5.4.100.0070.03512.02
5.4.90.0150.05212.02
5.4.80.0040.05412.02
5.4.70.0060.03412.01
5.4.60.0030.04412.01
5.4.50.0080.03612.00
5.4.40.0060.04012.00
5.4.30.0050.03612.00
5.4.20.0030.03812.00
5.4.10.0080.03712.00
5.4.00.0050.03711.49
5.3.290.0040.04212.80
5.3.280.0090.03512.71
5.3.270.0070.03812.72
5.3.260.0090.03712.72
5.3.250.0040.04012.72
5.3.240.0050.03712.71
5.3.230.0080.03812.71
5.3.220.0110.03412.68
5.3.210.0070.05412.68
5.3.200.0040.04012.68
5.3.190.0050.03912.68
5.3.180.0040.03812.68
5.3.170.0080.03412.66
5.3.160.0050.03812.67
5.3.150.0070.03712.67
5.3.140.0040.03812.66
5.3.130.0080.03812.66
5.3.120.0030.04312.66
5.3.110.0080.04912.66
5.3.100.0110.04012.13
5.3.90.0040.03912.11
5.3.80.0100.03212.10
5.3.70.0070.03512.10
5.3.60.0060.04012.08
5.3.50.0050.04112.02
5.3.40.0060.03612.02
5.3.30.0050.03511.98
5.3.20.0050.04111.78
5.3.10.0050.03511.73
5.3.00.0050.03711.72
5.2.170.0040.0329.24
5.2.160.0020.0329.23
5.2.150.0040.0319.23
5.2.140.0050.0309.23
5.2.130.0060.0289.20
5.2.120.0050.0309.20
5.2.110.0030.0379.20
5.2.100.0030.0309.20
5.2.90.0050.0359.20
5.2.80.0030.0319.19
5.2.70.0070.0279.20
5.2.60.0070.0339.14
5.2.50.0060.0299.12
5.2.40.0020.0319.10
5.2.30.0070.0279.07
5.2.20.0030.0309.06
5.2.10.0060.0268.96
5.2.00.0040.0298.83
5.1.60.0020.0268.11
5.1.50.0050.0248.11
5.1.40.0050.0288.09
5.1.30.0030.0278.43
5.1.20.0080.0348.45
5.1.10.0050.0348.18
5.1.00.0050.0278.19
5.0.50.0020.0226.66
5.0.40.0050.0176.52
5.0.30.0010.0416.34
5.0.20.0040.0266.30
5.0.10.0030.0236.28
5.0.00.0030.0316.27
4.4.90.0050.0134.78
4.4.80.0010.0174.76
4.4.70.0040.0154.75
4.4.60.0020.0184.75
4.4.50.0050.0134.77
4.4.40.0040.0244.71
4.4.30.0050.0134.76
4.4.20.0000.0184.84
4.4.10.0020.0164.84
4.4.00.0040.0244.76
4.3.110.0030.0164.67
4.3.100.0040.0174.66
4.3.90.0050.0164.63
4.3.80.0020.0264.59
4.3.70.0100.0204.63
4.3.60.0040.0154.63
4.3.50.0050.0134.62
4.3.40.0030.0234.54
4.3.30.0020.0163.32
4.3.20.0050.0203.30
4.3.10.0020.0243.27
4.3.00.0000.0276.92

preferences:
47.8 ms | 401 KiB | 5 Q