3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string); $strLengthHalf = round(strlen($string) / 2); var_dump($strLength); var_dump($strLengthHalf); for ($i = 0; $i < round(strlen($string)/ 2) - 1; $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)
8.3.60.0070.00718.68
8.3.50.0100.01016.59
8.3.40.0160.00319.14
8.3.30.0110.00319.36
8.3.20.0040.00420.34
8.3.10.0030.00623.60
8.3.00.0040.00419.38
8.2.180.0030.01316.75
8.2.170.0090.00622.96
8.2.160.0070.00720.21
8.2.150.0070.01024.18
8.2.140.0030.00524.66
8.2.130.0080.00026.16
8.2.120.0040.00422.28
8.2.110.0070.00320.64
8.2.100.0100.00318.22
8.2.90.0080.00019.34
8.2.80.0060.00317.97
8.2.70.0000.01017.50
8.2.60.0000.00818.16
8.2.50.0050.00318.07
8.2.40.0000.00820.00
8.2.30.0000.00718.12
8.2.20.0060.00317.94
8.2.10.0070.00018.13
8.2.00.0000.00717.82
8.1.270.0080.00022.27
8.1.260.0000.00826.35
8.1.250.0040.00428.09
8.1.240.0030.00623.93
8.1.230.0070.00319.20
8.1.220.0040.00417.78
8.1.210.0060.00318.77
8.1.200.0060.00317.25
8.1.190.0040.00417.22
8.1.180.0050.00318.10
8.1.170.0050.00318.43
8.1.160.0050.00322.07
8.1.150.0000.00718.96
8.1.140.0050.00317.60
8.1.130.0070.00017.79
8.1.120.0000.00717.38
8.1.110.0050.00317.54
8.1.100.0070.00017.47
8.1.90.0040.00417.52
8.1.80.0000.00717.38
8.1.70.0000.00817.37
8.1.60.0040.00417.69
8.1.50.0040.00417.54
8.1.40.0030.00617.58
8.1.30.0080.00017.77
8.1.20.0040.00417.75
8.1.10.0080.00017.69
8.1.00.0000.00717.59
8.0.300.0040.00418.77
8.0.290.0000.00716.88
8.0.280.0030.00318.40
8.0.270.0000.00717.38
8.0.260.0070.00017.33
8.0.250.0030.00317.09
8.0.240.0040.00417.14
8.0.230.0070.00017.12
8.0.220.0000.00816.99
8.0.210.0030.00316.92
8.0.200.0000.00717.12
8.0.190.0040.00417.11
8.0.180.0050.00216.97
8.0.170.0080.00017.10
8.0.160.0030.00317.02
8.0.150.0070.00016.91
8.0.140.0040.00416.91
8.0.130.0000.00613.34
8.0.120.0050.00316.89
8.0.110.0050.00216.97
8.0.100.0000.00817.02
8.0.90.0000.00716.92
8.0.80.0170.00017.02
8.0.70.0070.00017.10
8.0.60.0040.00416.88
8.0.50.0050.00217.09
8.0.30.0120.00817.23
8.0.20.0090.01117.46
8.0.10.0040.00416.96
8.0.00.0090.00916.90
7.4.330.0020.00215.12
7.4.320.0000.00916.57
7.4.300.0030.00316.68
7.4.290.0020.00516.67
7.4.280.0000.00716.55
7.4.270.0070.00016.57
7.4.260.0030.00316.61
7.4.250.0000.00716.62
7.4.240.0020.00516.58
7.4.230.0030.00316.38
7.4.220.0110.00816.63
7.4.210.0050.01016.59
7.4.200.0030.00316.69
7.4.160.0070.01016.66
7.4.150.0110.00817.40
7.4.140.0080.01117.86
7.4.130.0080.00916.69
7.4.120.0090.00816.61
7.4.110.0080.00816.61
7.4.100.0030.01316.50
7.4.90.0130.00416.46
7.4.80.0030.01419.39
7.4.70.0160.00316.71
7.4.60.0100.00616.58
7.4.50.0040.00416.75
7.4.40.0080.00816.64
7.4.30.0110.00716.46
7.4.00.0050.00715.13
7.3.330.0030.00313.52
7.3.320.0060.00013.44
7.3.310.0030.00316.54
7.3.300.0030.00316.52
7.3.290.0060.00916.52
7.3.280.0100.00616.50
7.3.270.0130.00617.40
7.3.260.0130.00316.50
7.3.250.0090.00916.61
7.3.240.0120.00416.54
7.3.230.0160.00616.53
7.3.210.0060.01216.54
7.3.200.0150.00719.39
7.3.190.0080.00816.52
7.3.180.0100.00616.54
7.3.170.0080.00916.50
7.3.160.0050.01016.60
7.3.120.0120.00315.05
7.3.110.0070.00314.77
7.3.100.0080.00414.67
7.3.90.0090.00314.71
7.3.80.0030.00914.78
7.3.70.0110.00414.83
7.3.60.0030.01014.85
7.3.50.0080.00414.87
7.3.40.0070.00714.73
7.3.30.0030.01014.85
7.3.20.0090.00616.73
7.3.10.0070.01016.68
7.3.00.0120.00416.61
7.2.330.0060.01216.73
7.2.320.0070.01116.82
7.2.310.0140.00316.83
7.2.300.0090.00916.52
7.2.290.0100.01316.61
7.2.250.0030.01615.07
7.2.240.0040.01415.19
7.2.230.0000.01615.24
7.2.220.0080.00415.02
7.2.210.0080.00814.96
7.2.200.0060.00615.05
7.2.190.0030.00614.89
7.2.180.0030.01415.08
7.2.170.0030.01115.12
7.2.00.0030.01219.27
7.1.330.0030.01015.65
7.1.320.0030.00715.88
7.1.310.0090.00615.94
7.1.300.0100.00615.80
7.1.290.0130.00315.99
7.1.280.0090.00315.84
7.1.270.0000.01315.81
7.1.260.0070.00715.97
7.1.100.0040.01118.14
7.1.70.0060.00917.32
7.1.60.0110.01419.11
7.1.50.0090.01616.98
7.1.00.0030.07722.40
7.0.200.0000.00816.79
7.0.140.0030.07322.21
7.0.60.0070.08019.92
7.0.50.0070.03717.89
7.0.40.0000.09320.05
7.0.30.0130.05320.11
7.0.20.0200.04720.15
7.0.10.0000.04720.23
7.0.00.0030.05020.17
5.6.280.0070.07020.79
5.6.210.0170.07320.47
5.6.200.0030.08018.20
5.6.190.0070.04020.43
5.6.180.0400.06720.39
5.6.170.0230.03320.57
5.6.160.0030.04020.58
5.6.150.0030.04718.25
5.6.140.0000.04318.18
5.6.130.0030.06718.28
5.6.120.0070.04321.14
5.6.110.0130.08021.14
5.6.100.0100.08721.03
5.6.90.0070.05020.98
5.6.80.0070.07720.49
5.6.70.3370.03320.38
5.5.350.0170.07320.44
5.5.340.0030.06317.99
5.5.330.0130.05720.19
5.5.320.0400.04720.48
5.5.310.0300.06320.48
5.5.300.0030.05017.95
5.5.290.0000.06717.96
5.5.280.0070.08320.96
5.5.270.0100.08020.76
5.5.260.0000.07320.76
5.5.250.0130.07320.58
5.5.240.0370.05720.14
5.4.450.0230.07019.48
5.4.440.0900.06319.67
5.4.430.0570.06719.54
5.4.420.0730.07319.47
5.4.410.0730.05719.04
5.4.400.0830.06319.35
5.4.390.0730.06019.12
5.4.380.0600.06019.15
5.4.370.0770.04319.14
5.4.360.0600.06019.34
5.4.350.0730.05319.29
5.4.340.0040.04012.02
5.4.320.0080.03912.51
5.4.310.0070.04112.51
5.4.300.0070.04512.51
5.4.290.0030.04112.50
5.4.280.0090.03312.40
5.4.270.0070.03512.40
5.4.260.0050.03912.40
5.4.250.0090.04812.40
5.4.240.0130.04912.40
5.4.230.0080.05312.39
5.4.220.0060.04012.39
5.4.210.0070.03412.39
5.4.200.0060.04112.39
5.4.190.0100.03412.39
5.4.180.0070.04112.39
5.4.170.0090.04312.40
5.4.160.0090.03512.39
5.4.150.0060.04312.39
5.4.140.0060.03812.08
5.4.130.0070.03712.06
5.4.120.0070.03512.02
5.4.110.0050.04212.02
5.4.100.0090.03212.01
5.4.90.0080.03412.02
5.4.80.0070.03512.02
5.4.70.0070.03412.02
5.4.60.0070.03412.02
5.4.50.0080.03912.01
5.4.40.0100.03012.00
5.4.30.0060.03512.00
5.4.20.0100.03212.00
5.4.10.0080.03412.00
5.4.00.0150.03911.49
5.3.290.0040.04412.80
5.3.280.0090.03812.71
5.3.270.0090.03712.72
5.3.260.0060.04312.72
5.3.250.0090.03612.71
5.3.240.0090.03512.72
5.3.230.0070.03712.71
5.3.220.0030.04012.68
5.3.210.0100.03412.68
5.3.200.0080.03312.68
5.3.190.0030.04312.68
5.3.180.0060.03812.68
5.3.170.0060.03712.67
5.3.160.0030.04112.67
5.3.150.0080.03512.68
5.3.140.0040.04212.66
5.3.130.0060.04112.66
5.3.120.0070.04012.66
5.3.110.0100.03912.66
5.3.100.0080.04012.12
5.3.90.0080.03512.11
5.3.80.0050.03712.10
5.3.70.0070.03612.10
5.3.60.0090.03312.08
5.3.50.0060.03612.02
5.3.40.0070.03612.02
5.3.30.0080.03811.98
5.3.20.0040.03811.77
5.3.10.0100.03111.73
5.3.00.0030.03911.72
5.2.170.0060.0329.23
5.2.160.0040.0329.24
5.2.150.0070.0289.25
5.2.140.0060.0309.23
5.2.130.0050.0299.19
5.2.120.0090.0249.20
5.2.110.0050.0299.20
5.2.100.0040.0299.20
5.2.90.0060.0289.20
5.2.80.0020.0339.19
5.2.70.0050.0309.20
5.2.60.0070.0289.15
5.2.50.0030.0319.12
5.2.40.0080.0269.10
5.2.30.0070.0279.07
5.2.20.0060.0279.06
5.2.10.0060.0268.96
5.2.00.0080.0268.83
5.1.60.0030.0258.11
5.1.50.0040.0248.10
5.1.40.0020.0268.08
5.1.30.0030.0278.44
5.1.20.0060.0248.46
5.1.10.0070.0288.19
5.1.00.0060.0348.19
5.0.50.0040.0276.68
5.0.40.0060.0246.53
5.0.30.0070.0346.34
5.0.20.0050.0206.31
5.0.10.0040.0196.29
5.0.00.0050.0296.29
4.4.90.0000.0194.78
4.4.80.0030.0154.75
4.4.70.0030.0154.75
4.4.60.0020.0164.75
4.4.50.0030.0154.77
4.4.40.0000.0284.71
4.4.30.0030.0154.76
4.4.20.0020.0164.84
4.4.10.0060.0134.85
4.4.00.0050.0234.75
4.3.110.0010.0174.67
4.3.100.0040.0144.67
4.3.90.0050.0124.63
4.3.80.0080.0224.58
4.3.70.0060.0124.63
4.3.60.0010.0164.63
4.3.50.0030.0154.63
4.3.40.0020.0254.54
4.3.30.0020.0163.34
4.3.20.0020.0213.31
4.3.10.0030.0153.28
4.3.00.0000.0236.69

preferences:
81.71 ms | 400 KiB | 5 Q