3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string); $strLengthHalf = round(strlen($string) / 2); for ($i = 0; $i < $strLengthHalf -$i; $i++) { var_dump($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)
8.3.60.0140.00718.68
8.3.50.0040.01121.21
8.3.40.0150.00319.04
8.3.30.0060.01319.17
8.3.20.0000.00720.17
8.3.10.0080.00023.66
8.3.00.0040.00419.36
8.2.180.0030.01216.86
8.2.170.0040.01122.96
8.2.160.0070.00720.57
8.2.150.0060.00324.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0040.00422.21
8.2.110.0050.00522.07
8.2.100.0120.00017.88
8.2.90.0060.00319.21
8.2.80.0040.00417.97
8.2.70.0050.00317.71
8.2.60.0100.00018.18
8.2.50.0060.00318.07
8.2.40.0040.00420.07
8.2.30.0000.00918.19
8.2.20.0040.00417.86
8.2.10.0040.00418.19
8.2.00.0000.00717.68
8.1.280.0090.00625.92
8.1.270.0040.00424.04
8.1.260.0060.00326.35
8.1.250.0000.00728.09
8.1.240.0060.00323.92
8.1.230.0030.01019.26
8.1.220.0050.00317.77
8.1.210.0040.00418.77
8.1.200.0060.00317.13
8.1.190.0090.00017.23
8.1.180.0040.00418.10
8.1.170.0070.00418.46
8.1.160.0040.00421.92
8.1.150.0000.00818.88
8.1.140.0070.00017.45
8.1.130.0000.00717.84
8.1.120.0040.00417.43
8.1.110.0000.00817.33
8.1.100.0070.00017.49
8.1.90.0040.00417.40
8.1.80.0070.00017.45
8.1.70.0000.00717.43
8.1.60.0060.00317.61
8.1.50.0000.00817.59
8.1.40.0040.00417.60
8.1.30.0000.00817.62
8.1.20.0070.00017.70
8.1.10.0060.00317.52
8.1.00.0040.00417.53
8.0.300.0000.00718.77
8.0.290.0040.00416.88
8.0.280.0070.00018.44
8.0.270.0000.00717.29
8.0.260.0030.00317.36
8.0.250.0030.00317.04
8.0.240.0030.00316.94
8.0.230.0070.00017.07
8.0.220.0040.00416.92
8.0.210.0030.00317.02
8.0.200.0040.00416.94
8.0.190.0040.00416.98
8.0.180.0080.00017.04
8.0.170.0040.00417.07
8.0.160.0040.00417.04
8.0.150.0040.00416.88
8.0.140.0080.00016.96
8.0.130.0030.00313.42
8.0.120.0040.00417.00
8.0.110.0000.00716.98
8.0.100.0040.00416.82
8.0.90.0030.00316.84
8.0.80.0120.00317.06
8.0.70.0030.00616.82
8.0.60.0070.00017.05
8.0.50.0080.00016.89
8.0.30.0080.01017.10
8.0.20.0120.01117.40
8.0.10.0050.00217.10
8.0.00.0050.01216.92
7.4.330.0020.00215.05
7.4.320.0060.00316.38
7.4.300.0000.00616.64
7.4.290.0030.00316.48
7.4.280.0030.00316.62
7.4.270.0030.00316.49
7.4.260.0000.00816.57
7.4.250.0030.00516.57
7.4.240.0020.00516.59
7.4.230.0070.00016.55
7.4.220.0100.00716.66
7.4.210.0060.01316.52
7.4.200.0040.00416.73
7.4.160.0110.01116.49
7.4.150.0140.00417.40
7.4.140.0120.00617.86
7.4.130.0100.00616.59
7.4.120.0070.01316.56
7.4.110.0100.01016.60
7.4.100.0170.00016.60
7.4.90.0120.00616.60
7.4.80.0110.00519.39
7.4.70.0080.01216.54
7.4.60.0100.00716.55
7.4.50.0000.00516.80
7.4.40.0000.01816.70
7.4.30.0130.00316.43
7.4.00.0100.00314.70
7.3.330.0030.00213.48
7.3.320.0040.00413.45
7.3.310.0000.00716.50
7.3.300.0070.00016.36
7.3.290.0050.00916.46
7.3.280.0070.01016.47
7.3.270.0090.00917.40
7.3.260.0130.00716.61
7.3.250.0130.00416.51
7.3.240.0110.00716.67
7.3.230.0170.00016.52
7.3.210.0080.01016.53
7.3.200.0060.01219.39
7.3.190.0160.00516.46
7.3.180.0070.01516.46
7.3.170.0110.00816.50
7.3.160.0120.00316.52
7.3.10.0130.00316.46
7.3.00.0030.00716.56
7.2.330.0090.00916.79
7.2.320.0180.00016.66
7.2.310.0070.01016.64
7.2.300.0080.00816.95
7.2.290.0070.01416.52
7.2.130.0000.01516.73
7.2.120.0060.01216.77
7.2.110.0120.00416.91
7.2.100.0000.01316.62
7.2.90.0070.00416.89
7.2.80.0130.00316.40
7.2.70.0140.00316.88
7.2.60.0100.00716.88
7.2.50.0030.00916.70
7.2.40.0110.00416.78
7.2.30.0030.00716.87
7.2.20.0070.00716.93
7.2.10.0040.01216.82
7.2.00.0060.00618.19
7.1.250.0120.00915.56
7.1.100.0080.00418.05
7.1.70.0040.00417.19
7.1.60.0070.01719.11
7.1.50.0030.01917.01
7.1.00.0100.07022.36
7.0.200.0030.00616.95
7.0.140.0000.07722.08
7.0.60.0130.08320.09
7.0.50.0100.07717.86
7.0.40.0030.09020.27
7.0.30.0270.06020.13
7.0.20.0170.07020.13
7.0.10.0070.04320.10
7.0.00.0070.07020.23
5.6.280.0070.07020.99
5.6.210.0030.09720.60
5.6.200.0000.04318.19
5.6.190.0030.04720.48
5.6.180.0230.05320.50
5.6.170.0230.04020.64
5.6.160.0000.04320.67
5.6.150.0030.07018.16
5.6.140.0070.08018.14
5.6.130.0100.05018.21
5.6.120.0000.05321.02
5.6.110.0070.08321.13
5.6.100.0030.04021.01
5.6.90.0100.06720.99
5.6.80.0100.07020.36
5.6.70.4500.03320.40
5.5.350.0170.08020.41
5.5.340.0070.08017.96
5.5.330.0170.08020.40
5.5.320.0270.07720.41
5.5.310.0270.08020.24
5.5.300.0030.03717.95
5.5.290.0100.06017.96
5.5.280.0130.08020.77
5.5.270.0030.07020.75
5.5.260.0100.07720.79
5.5.250.0030.06720.70
5.5.240.0170.04020.29
5.4.450.0670.05719.44
5.4.440.0770.05719.63
5.4.430.0570.08019.47
5.4.420.0830.06019.45
5.4.410.0700.06019.35
5.4.400.0930.07019.31
5.4.390.0730.04719.15
5.4.380.0930.05319.29
5.4.370.0630.05319.26
5.4.360.0630.06319.01
5.4.350.0100.05319.01
5.4.340.0080.04612.02
5.4.320.0090.03512.51
5.4.310.0060.04012.50
5.4.300.0090.03712.51
5.4.290.0070.03712.50
5.4.280.0060.03512.40
5.4.270.0080.03412.40
5.4.260.0040.03912.40
5.4.250.0050.03912.40
5.4.240.0080.03412.40
5.4.230.0060.04012.39
5.4.220.0070.03512.39
5.4.210.0070.03612.40
5.4.200.0050.03912.40
5.4.190.0050.03612.39
5.4.180.0040.03712.39
5.4.170.0060.04412.39
5.4.160.0090.03212.40
5.4.150.0060.03712.39
5.4.140.0080.03412.07
5.4.130.0050.03612.06
5.4.120.0090.03312.02
5.4.110.0090.04312.02
5.4.100.0090.03512.02
5.4.90.0090.03412.02
5.4.80.0070.04512.02
5.4.70.0110.04612.01
5.4.60.0070.03912.01
5.4.50.0080.03812.02
5.4.40.0120.04912.00
5.4.30.0050.03612.00
5.4.20.0060.03512.00
5.4.10.0060.03512.00
5.4.00.0050.03911.49
5.3.290.0070.03812.80
5.3.280.0080.03812.70
5.3.270.0030.04212.73
5.3.260.0070.03812.71
5.3.250.0090.03512.72
5.3.240.0060.03812.72
5.3.230.0090.03512.71
5.3.220.0070.03512.68
5.3.210.0060.04412.68
5.3.200.0060.03612.68
5.3.190.0070.03612.67
5.3.180.0070.03512.67
5.3.170.0060.03712.67
5.3.160.0090.03312.68
5.3.150.0050.03812.67
5.3.140.0080.04012.66
5.3.130.0050.03912.66
5.3.120.0100.03712.66
5.3.110.0060.03912.66
5.3.100.0050.03812.13
5.3.90.0040.03812.11
5.3.80.0090.04012.10
5.3.70.0060.03612.10
5.3.60.0060.03512.08
5.3.50.0040.03812.02
5.3.40.0080.04012.02
5.3.30.0040.03511.98
5.3.20.0060.03411.77
5.3.10.0050.05111.73
5.3.00.0100.04911.72
5.2.170.0090.0399.23
5.2.160.0050.0369.23
5.2.150.0040.0329.23
5.2.140.0070.0289.23
5.2.130.0050.0299.19
5.2.120.0060.0279.19
5.2.110.0040.0319.20
5.2.100.0020.0329.19
5.2.90.0060.0279.20
5.2.80.0070.0319.20
5.2.70.0080.0289.19
5.2.60.0090.0359.15
5.2.50.0030.0319.12
5.2.40.0010.0399.09
5.2.30.0050.0309.07
5.2.20.0010.0329.05
5.2.10.0030.0298.96
5.2.00.0060.0278.83
5.1.60.0030.0258.11
5.1.50.0030.0268.10
5.1.40.0030.0268.08
5.1.30.0020.0288.44
5.1.20.0030.0288.46
5.1.10.0050.0258.18
5.1.00.0020.0278.19
5.0.50.0050.0196.66
5.0.40.0030.0196.52
5.0.30.0050.0296.33
5.0.20.0050.0186.30
5.0.10.0040.0196.28
5.0.00.0050.0296.27
4.4.90.0020.0164.78
4.4.80.0020.0164.75
4.4.70.0040.0154.75
4.4.60.0030.0154.75
4.4.50.0010.0174.77
4.4.40.0040.0244.71
4.4.30.0010.0174.76
4.4.20.0030.0234.84
4.4.10.0040.0144.85
4.4.00.0020.0254.76
4.3.110.0040.0144.67
4.3.100.0010.0174.67
4.3.90.0030.0144.63
4.3.80.0030.0244.58
4.3.70.0030.0144.63
4.3.60.0050.0184.63
4.3.50.0030.0164.63
4.3.40.0030.0244.54
4.3.30.0000.0183.32
4.3.20.0030.0153.30
4.3.10.0030.0153.26
4.3.00.0130.0236.85

preferences:
40.94 ms | 401 KiB | 5 Q