3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string); $strLengthHalf = round(strlen($string) / 2)-1; for ($i = 0; $i <= $strLengthHalf; $i++) { $substr1 .= $string[$strLength-$i]; $substr2 .= $string[$strLengthHalf - $i]; } 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)
8.3.60.0040.01118.68
8.3.50.0120.00721.15
8.3.40.0110.00418.74
8.3.30.0030.01019.29
8.3.20.0040.00420.25
8.3.10.0080.00023.64
8.3.00.0080.00019.51
8.2.180.0140.00718.25
8.2.170.0110.00422.96
8.2.160.0100.00320.64
8.2.150.0040.00424.18
8.2.140.0080.00024.66
8.2.130.0070.00026.16
8.2.120.0040.00422.05
8.2.110.0040.00420.71
8.2.100.0040.00718.22
8.2.90.0000.00819.35
8.2.80.0000.00817.97
8.2.70.0090.00017.75
8.2.60.0040.00418.18
8.2.50.0040.00418.07
8.2.40.0040.00420.20
8.2.30.0050.00218.07
8.2.20.0000.00717.70
8.2.10.0040.00418.11
8.2.00.0040.00417.72
8.1.280.0180.00425.92
8.1.270.0060.00321.93
8.1.260.0000.00826.35
8.1.250.0040.00428.09
8.1.240.0060.00323.96
8.1.230.0030.00819.23
8.1.220.0000.00817.91
8.1.210.0080.00018.77
8.1.200.0040.00417.23
8.1.190.0040.00417.23
8.1.180.0000.00818.10
8.1.170.0080.00018.43
8.1.160.0030.00322.08
8.1.150.0020.00518.88
8.1.140.0000.00917.51
8.1.130.0000.00717.77
8.1.120.0000.00717.43
8.1.110.0000.00817.48
8.1.100.0040.00417.46
8.1.90.0070.00017.45
8.1.80.0000.00717.47
8.1.70.0030.00317.35
8.1.60.0030.00617.54
8.1.50.0040.00417.50
8.1.40.0060.00317.48
8.1.30.0050.00317.77
8.1.20.0080.00017.77
8.1.10.0040.00417.63
8.1.00.0040.00417.58
8.0.300.0000.00718.77
8.0.290.0050.00216.75
8.0.280.0030.00518.51
8.0.270.0000.00717.32
8.0.260.0030.00317.31
8.0.250.0050.00217.02
8.0.240.0000.00717.09
8.0.230.0060.00317.11
8.0.220.0030.00317.04
8.0.210.0000.00717.06
8.0.200.0030.00317.07
8.0.190.0000.00716.98
8.0.180.0040.00416.97
8.0.170.0070.00017.13
8.0.160.0000.00716.93
8.0.150.0000.00816.94
8.0.140.0040.00416.93
8.0.130.0060.00013.52
8.0.120.0000.00717.02
8.0.110.0000.00716.96
8.0.100.0000.00717.07
8.0.90.0000.00716.91
8.0.80.0100.00717.05
8.0.70.0040.00416.86
8.0.60.0050.00317.05
8.0.50.0030.00416.84
8.0.30.0140.00517.33
8.0.20.0110.01017.40
8.0.10.0040.00416.91
8.0.00.0060.01116.89
7.4.330.0000.00515.02
7.4.320.0050.00516.54
7.4.300.0030.00316.66
7.4.290.0030.00316.66
7.4.280.0040.00416.48
7.4.270.0030.00316.65
7.4.260.0070.00016.64
7.4.250.0030.00316.70
7.4.240.0060.00116.49
7.4.230.0030.00316.68
7.4.220.0100.00716.68
7.4.210.0070.01316.60
7.4.200.0030.00316.69
7.4.160.0030.01216.70
7.4.150.0110.00817.40
7.4.140.0120.00917.86
7.4.130.0130.00316.53
7.4.120.0100.00716.70
7.4.110.0090.01216.63
7.4.100.0130.00316.59
7.4.90.0100.00516.71
7.4.80.0110.01119.39
7.4.70.0130.00616.61
7.4.60.0120.00616.67
7.4.50.0030.00616.54
7.4.40.0060.01016.58
7.4.30.0030.01716.61
7.4.00.0060.00814.96
7.3.330.0050.00013.50
7.3.320.0000.00613.48
7.3.310.0070.00016.59
7.3.300.0000.00716.37
7.3.290.0090.00716.49
7.3.280.0090.00916.50
7.3.270.0150.00317.40
7.3.260.0040.01216.54
7.3.250.0060.01316.56
7.3.240.0100.00616.50
7.3.230.0140.00416.46
7.3.210.0110.00916.70
7.3.200.0110.01119.39
7.3.190.0080.00916.52
7.3.180.0120.00916.71
7.3.170.0150.00716.46
7.3.160.0110.00616.61
7.3.120.0110.00815.03
7.3.110.0030.01514.91
7.3.100.0050.00914.82
7.3.90.0070.00415.06
7.3.80.0060.01014.80
7.3.70.0100.00714.92
7.3.60.0050.01214.88
7.3.50.0050.00514.84
7.3.40.0060.00814.75
7.3.30.0060.00514.79
7.3.20.0080.00516.71
7.3.10.0220.01016.49
7.3.00.0070.00816.52
7.2.330.0150.00616.83
7.2.320.0060.01216.80
7.2.310.0030.01316.74
7.2.300.0100.00716.78
7.2.290.0030.01716.79
7.2.250.0100.01015.07
7.2.240.0080.00915.14
7.2.230.0000.01414.96
7.2.220.0040.00915.21
7.2.210.0080.00815.03
7.2.200.0020.01015.04
7.2.190.0080.00915.04
7.2.180.0060.00814.99
7.2.170.0020.01015.17
7.2.130.0130.01016.79
7.2.120.0130.01016.39
7.2.110.0080.01316.18
7.2.100.0120.01616.24
7.2.90.0190.00816.48
7.2.80.0190.00616.58
7.2.70.0130.01316.29
7.2.60.0130.00716.63
7.2.50.0150.00317.00
7.2.40.0090.00917.01
7.2.30.0100.00317.05
7.2.20.0090.00616.95
7.2.10.0090.00916.34
7.2.00.0100.00316.74
7.1.330.0060.00715.61
7.1.320.0060.00715.90
7.1.310.0030.00815.85
7.1.300.0110.00715.73
7.1.290.0080.00515.62
7.1.280.0030.01015.72
7.1.270.0040.01115.68
7.1.260.0030.00815.70
7.1.250.0100.01315.28
7.1.100.0000.01318.08
7.1.70.0030.00617.18
7.1.60.0070.01719.11
7.1.50.0070.01816.69
7.1.00.0000.08022.48
7.0.200.0060.00316.58
7.0.140.0030.07022.02
7.0.60.0230.07319.90
7.0.50.0000.04317.86
7.0.40.0070.08020.11
7.0.30.0170.05020.26
7.0.20.0330.04720.06
7.0.10.0000.05020.24
7.0.00.0070.08020.25
5.6.280.0100.06721.03
5.6.210.0100.07720.64
5.6.200.0030.06318.29
5.6.190.0130.06320.63
5.6.180.0330.06020.53
5.6.170.0170.04720.68
5.6.160.0100.03720.63
5.6.150.0030.09018.27
5.6.140.0070.04718.18
5.6.130.0170.08018.23
5.6.120.0030.05021.00
5.6.110.0030.08721.00
5.6.100.0130.04321.12
5.6.90.0070.04021.13
5.6.80.0170.07720.38
5.6.70.4470.03320.53
5.5.350.0130.07320.43
5.5.340.0100.07718.05
5.5.330.0070.06020.18
5.5.320.0330.06320.25
5.5.310.0200.04020.38
5.5.300.0100.05018.07
5.5.290.0070.07717.93
5.5.280.0100.08020.88
5.5.270.0030.08320.89
5.5.260.0100.06020.98
5.5.250.0070.05020.59
5.5.240.0200.06320.37
5.4.450.0900.06019.59
5.4.440.0870.05319.16
5.4.430.0200.04719.30
5.4.420.1030.05019.60
5.4.410.1000.05719.34
5.4.400.0730.05019.15
5.4.390.0770.05319.28
5.4.380.0700.07318.98
5.4.370.0700.05019.15
5.4.360.0730.05719.15
5.4.350.0830.05719.15
5.4.340.0080.03712.02
5.4.320.0060.03712.50
5.4.310.0100.04212.50
5.4.300.0100.03712.50
5.4.290.0070.04012.50
5.4.280.0050.03812.40
5.4.270.0030.04112.40
5.4.260.0040.04812.40
5.4.250.0100.04912.40
5.4.240.0110.04712.40
5.4.230.0080.05312.39
5.4.220.0110.04712.39
5.4.210.0060.03912.39
5.4.200.0040.04212.39
5.4.190.0080.03312.39
5.4.180.0090.03612.39
5.4.170.0070.03712.40
5.4.160.0040.04012.39
5.4.150.0050.04012.39
5.4.140.0040.05212.07
5.4.130.0130.04612.05
5.4.120.0080.05712.02
5.4.110.0050.04712.01
5.4.100.0050.03712.01
5.4.90.0060.03812.02
5.4.80.0100.04012.01
5.4.70.0070.04112.01
5.4.60.0040.03912.01
5.4.50.0040.04512.01
5.4.40.0070.03612.00
5.4.30.0020.04112.00
5.4.20.0060.03611.99
5.4.10.0050.04111.99
5.4.00.0060.04911.48
5.3.290.0060.05512.80
5.3.280.0050.05112.71
5.3.270.0110.04912.72
5.3.260.0070.05512.72
5.3.250.0090.04912.72
5.3.240.0070.03712.72
5.3.230.0080.03612.71
5.3.220.0090.04012.68
5.3.210.0060.04012.68
5.3.200.0020.04112.68
5.3.190.0070.03812.68
5.3.180.0150.03212.68
5.3.170.0040.04312.67
5.3.160.0040.04212.68
5.3.150.0040.04012.67
5.3.140.0080.03712.66
5.3.130.0100.04512.66
5.3.120.0070.03912.66
5.3.110.0060.04012.66
5.3.100.0060.03712.12
5.3.90.0070.03512.11
5.3.80.0080.03712.09
5.3.70.0050.03912.09
5.3.60.0050.03712.08
5.3.50.0070.03412.02
5.3.40.0040.03812.02
5.3.30.0050.03711.98
5.3.20.0060.03511.76
5.3.10.0070.03511.73
5.3.00.0070.03511.72
5.2.170.0040.0329.23
5.2.160.0060.0299.23
5.2.150.0040.0319.23
5.2.140.0060.0459.23
5.2.130.0040.0309.19
5.2.120.0040.0299.19
5.2.110.0040.0329.20
5.2.100.0030.0319.19
5.2.90.0060.0299.20
5.2.80.0050.0319.19
5.2.70.0040.0309.19
5.2.60.0110.0249.14
5.2.50.0050.0379.12
5.2.40.0090.0359.09
5.2.30.0070.0399.06
5.2.20.0020.0409.05
5.2.10.0080.0278.96
5.2.00.0090.0308.82
5.1.60.0030.0268.10
5.1.50.0040.0348.10
5.1.40.0070.0318.08
5.1.30.0070.0238.43
5.1.20.0030.0288.45
5.1.10.0060.0248.18
5.1.00.0040.0268.18
5.0.50.0130.0116.65
5.0.40.0100.0136.52
5.0.30.0110.0276.33
5.0.20.0110.0196.30
5.0.10.0080.0166.28
5.0.00.0060.0356.27
4.4.90.0040.0204.78
4.4.80.0030.0174.75
4.4.70.0090.0124.76
4.4.60.0050.0194.75
4.4.50.0060.0184.77
4.4.40.0040.0284.71
4.4.30.0040.0164.76
4.4.20.0030.0204.85
4.4.10.0060.0164.85
4.4.00.0030.0294.76
4.3.110.0060.0184.67
4.3.100.0060.0154.66
4.3.90.0030.0194.64
4.3.80.0040.0274.58
4.3.70.0030.0154.63
4.3.60.0050.0134.63
4.3.50.0020.0174.63
4.3.40.0000.0264.54
4.3.30.0030.0153.32
4.3.20.0020.0163.30
4.3.10.0030.0153.26
4.3.00.0070.0277.04

preferences:
48.75 ms | 400 KiB | 5 Q