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 < $strLengthHalf -$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)
8.3.60.0060.00918.68
8.3.50.0120.00316.43
8.3.40.0110.00418.96
8.3.30.0090.00619.20
8.3.20.0040.00420.25
8.3.10.0070.01123.79
8.3.00.0080.00019.38
8.2.180.0120.00316.63
8.2.170.0110.00422.96
8.2.160.0070.00720.50
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0040.00422.19
8.2.110.0050.00520.97
8.2.100.0060.00617.62
8.2.90.0050.00219.36
8.2.80.0000.00817.97
8.2.70.0080.00017.75
8.2.60.0040.00717.93
8.2.50.0060.00318.07
8.2.40.0030.00620.07
8.2.30.0070.00018.06
8.2.20.0000.00817.68
8.2.10.0080.00018.08
8.2.00.0000.00817.67
8.1.280.0180.00025.92
8.1.270.0080.00024.10
8.1.260.0080.00026.35
8.1.250.0000.00728.09
8.1.240.0110.00022.19
8.1.230.0040.00721.04
8.1.220.0000.00817.80
8.1.210.0030.00518.77
8.1.200.0000.01017.35
8.1.190.0040.00417.13
8.1.180.0000.00818.10
8.1.170.0070.00718.48
8.1.160.0040.00422.00
8.1.150.0000.00718.75
8.1.140.0040.00417.45
8.1.130.0040.00417.84
8.1.120.0000.00717.34
8.1.110.0000.00817.40
8.1.100.0000.00817.35
8.1.90.0000.00717.34
8.1.80.0070.00017.45
8.1.70.0030.00317.34
8.1.60.0050.00317.60
8.1.50.0000.00817.48
8.1.40.0030.00617.62
8.1.30.0050.00317.67
8.1.20.0080.00017.58
8.1.10.0020.00517.61
8.1.00.0050.00217.64
8.0.300.0000.00720.16
8.0.290.0000.00716.75
8.0.280.0070.00018.44
8.0.270.0040.00417.21
8.0.260.0030.00317.32
8.0.250.0070.00017.08
8.0.240.0000.00717.11
8.0.230.0030.00316.95
8.0.220.0030.00316.93
8.0.210.0050.00316.97
8.0.200.0000.00717.10
8.0.190.0000.00717.07
8.0.180.0000.00716.92
8.0.170.0040.00417.09
8.0.160.0000.00716.98
8.0.150.0050.00316.86
8.0.140.0070.00016.96
8.0.130.0000.00613.39
8.0.120.0050.00216.97
8.0.110.0070.00016.95
8.0.100.0070.00016.84
8.0.90.0000.00717.12
8.0.80.0070.01617.00
8.0.70.0040.00417.06
8.0.60.0040.00417.07
8.0.50.0070.00017.04
8.0.30.0100.01017.18
8.0.20.0110.00917.40
8.0.10.0040.00417.19
8.0.00.0110.00616.94
7.4.330.0060.00015.02
7.4.320.0100.00016.54
7.4.300.0030.00316.58
7.4.290.0030.00316.70
7.4.280.0030.00316.52
7.4.270.0000.00716.49
7.4.260.0000.00716.51
7.4.250.0000.00716.67
7.4.240.0050.00216.56
7.4.230.0000.00716.50
7.4.220.0080.01116.43
7.4.210.0170.00316.68
7.4.200.0000.00716.75
7.4.160.0110.00516.49
7.4.150.0070.01317.40
7.4.140.0110.01217.86
7.4.130.0060.01316.55
7.4.120.0140.00816.62
7.4.110.0060.01216.78
7.4.100.0130.00616.32
7.4.90.0180.00016.56
7.4.80.0130.01019.39
7.4.70.0100.01416.56
7.4.60.0030.02116.59
7.4.50.0030.00616.33
7.4.40.0070.01016.74
7.4.30.0130.00316.58
7.4.00.0060.00614.97
7.3.330.0000.00613.51
7.3.320.0000.00813.36
7.3.310.0030.00316.33
7.3.300.0000.00716.43
7.3.290.0070.00816.48
7.3.280.0110.00616.45
7.3.270.0120.00717.40
7.3.260.0030.01316.60
7.3.250.0100.00616.57
7.3.240.0140.00616.43
7.3.230.0140.00716.52
7.3.210.0080.00816.50
7.3.200.0100.00719.39
7.3.190.0080.00816.54
7.3.180.0030.01416.60
7.3.170.0140.00816.61
7.3.160.0090.00916.48
7.2.330.0100.00716.90
7.2.320.0030.01516.75
7.2.310.0120.00616.84
7.2.300.0110.00716.52
7.2.290.0050.01916.79
7.1.200.0000.01415.69
7.1.70.0050.00517.19
7.1.60.0140.01119.11
7.1.50.0080.01516.92
7.1.00.0070.07322.40
7.0.200.0030.00616.86
7.0.140.0070.07021.92
7.0.60.0200.06719.91
7.0.50.0200.06717.87
7.0.40.0030.05020.42
7.0.30.0330.07720.19
7.0.20.0230.04720.06
7.0.10.0100.06320.10
7.0.00.0000.09020.29
5.6.280.0030.07321.11
5.6.210.0000.04320.77
5.6.200.0000.07318.23
5.6.190.0130.07720.61
5.6.180.0230.07720.54
5.6.170.0370.07020.48
5.6.160.0100.05720.44
5.6.150.0100.07718.18
5.6.140.0070.04018.19
5.6.130.0000.04718.19
5.6.120.0000.04320.98
5.6.110.0070.07720.98
5.6.100.0100.07720.96
5.6.90.0130.07720.98
5.6.80.0130.08020.26
5.6.70.0030.04020.25
5.5.350.0170.08020.43
5.5.340.0030.05318.05
5.5.330.0000.06720.45
5.5.320.0230.04020.38
5.5.310.0200.05720.41
5.5.300.0130.07317.92
5.5.290.0100.04718.08
5.5.280.0200.07320.97
5.5.270.0070.07320.77
5.5.260.0030.04020.64
5.5.250.0070.08020.66
5.5.240.0230.08020.27
5.4.450.0230.05319.20
5.4.440.0170.05719.67
5.4.430.0130.05719.46
5.4.420.0200.04719.47
5.4.410.0200.05019.21
5.4.400.0130.05319.16
5.4.390.0100.06018.98
5.4.380.0070.05719.13
5.4.370.0170.05018.98
5.4.360.0330.06719.15
5.4.350.0500.04718.96
5.4.340.0020.04012.02
5.4.320.0050.04212.51
5.4.310.0090.04312.51
5.4.300.0050.03912.51
5.4.290.0100.04712.51
5.4.280.0030.04712.40
5.4.270.0050.03712.40
5.4.260.0060.03712.40
5.4.250.0080.03612.40
5.4.240.0050.04112.40
5.4.230.0040.04312.39
5.4.220.0110.04112.39
5.4.210.0060.03712.40
5.4.200.0070.03812.40
5.4.190.0150.04312.39
5.4.180.0060.05412.39
5.4.170.0080.03812.39
5.4.160.0060.03612.39
5.4.150.0040.03712.39
5.4.140.0050.03812.08
5.4.130.0040.03912.07
5.4.120.0070.03512.02
5.4.110.0060.04112.02
5.4.100.0070.04512.02
5.4.90.0050.03912.02
5.4.80.0040.04012.02
5.4.70.0060.03512.01
5.4.60.0070.03812.02
5.4.50.0040.03912.02
5.4.40.0090.04112.00
5.4.30.0050.04112.00
5.4.20.0110.04712.00
5.4.10.0100.04612.00
5.4.00.0100.05111.49
5.3.290.0070.04612.80
5.3.280.0030.04312.71
5.3.270.0080.05212.72
5.3.260.0160.04612.72
5.3.250.0100.03512.71
5.3.240.0070.03912.72
5.3.230.0070.03612.71
5.3.220.0060.03812.68
5.3.210.0060.04012.68
5.3.200.0060.03712.68
5.3.190.0070.03712.68
5.3.180.0050.03912.67
5.3.170.0070.04412.67
5.3.160.0070.04212.67
5.3.150.0060.03912.68
5.3.140.0050.04312.66
5.3.130.0110.05212.66
5.3.120.0080.05312.66
5.3.110.0050.04212.66
5.3.100.0110.03512.12
5.3.90.0080.04312.11
5.3.80.0120.05012.10
5.3.70.0090.04312.10
5.3.60.0040.04012.08
5.3.50.0060.03812.02
5.3.40.0080.03812.02
5.3.30.0090.04911.98
5.3.20.0080.04911.77
5.3.10.0040.04211.73
5.3.00.0050.03811.72
5.2.170.0080.0289.23
5.2.160.0060.0289.23
5.2.150.0060.0289.23
5.2.140.0030.0319.23
5.2.130.0040.0319.19
5.2.120.0020.0319.19
5.2.110.0050.0289.20
5.2.100.0050.0299.20
5.2.90.0050.0299.19
5.2.80.0020.0339.19
5.2.70.0060.0379.20
5.2.60.0030.0359.15
5.2.50.0040.0319.12
5.2.40.0050.0299.09
5.2.30.0060.0309.07
5.2.20.0050.0349.06
5.2.10.0020.0328.96
5.2.00.0060.0318.83
5.1.60.0050.0238.11
5.1.50.0030.0258.11
5.1.40.0030.0268.08
5.1.30.0040.0278.43
5.1.20.0030.0288.46
5.1.10.0040.0278.18
5.1.00.0030.0278.18
5.0.50.0030.0216.66
5.0.40.0040.0186.52
5.0.30.0060.0286.34
5.0.20.0030.0206.30
5.0.10.0040.0196.28
5.0.00.0040.0306.27
4.4.90.0040.0144.78
4.4.80.0020.0164.76
4.4.70.0070.0164.75
4.4.60.0030.0214.75
4.4.50.0020.0234.77
4.4.40.0020.0334.71
4.4.30.0020.0174.75
4.4.20.0040.0224.85
4.4.10.0050.0164.85
4.4.00.0010.0274.76
4.3.110.0060.0154.67
4.3.100.0010.0174.66
4.3.90.0020.0154.63
4.3.80.0030.0244.58
4.3.70.0050.0124.63
4.3.60.0010.0174.63
4.3.50.0030.0184.63
4.3.40.0020.0254.53
4.3.30.0050.0193.32
4.3.20.0020.0223.30
4.3.10.0040.0253.27
4.3.00.0000.0236.86

preferences:
53.8 ms | 400 KiB | 5 Q