3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string)-1; $strLengthHalf = round(strlen($string)-1 / 2); var_dump($strLength); var_dump($strLengthHalf); for ($i = 0; $i < $strLengthHalf - 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)
8.3.40.0140.00718.96
8.3.30.0090.00619.29
8.3.20.0040.00420.37
8.3.10.0000.00823.77
8.3.00.0080.00019.51
8.2.170.0180.00422.96
8.2.160.0140.00320.40
8.2.150.0140.00424.18
8.2.140.0070.00724.66
8.2.130.0070.00026.16
8.2.120.0040.00422.18
8.2.110.0070.00321.06
8.2.100.0040.00718.03
8.2.90.0000.00819.30
8.2.80.0060.00317.97
8.2.70.0040.00417.50
8.2.60.0030.00717.93
8.2.50.0040.00418.07
8.2.40.0000.00820.07
8.2.30.0050.00318.25
8.2.20.0040.00417.69
8.2.10.0050.00218.20
8.2.00.0060.00317.79
8.1.270.0050.00322.14
8.1.260.0070.00026.35
8.1.250.0120.00628.09
8.1.240.0030.00719.22
8.1.230.0140.00317.81
8.1.220.0090.00017.74
8.1.210.0050.00318.77
8.1.200.0060.00317.22
8.1.190.0040.00417.35
8.1.180.0030.00618.10
8.1.170.0030.00518.59
8.1.160.0050.00321.89
8.1.150.0050.00318.94
8.1.140.0040.00417.45
8.1.130.0030.00317.76
8.1.120.0070.00017.37
8.1.110.0040.00417.29
8.1.100.0050.00317.45
8.1.90.0050.00317.36
8.1.80.0000.00717.47
8.1.70.0040.00417.42
8.1.60.0050.00217.53
8.1.50.0030.00517.57
8.1.40.0040.00417.49
8.1.30.0050.00317.59
8.1.20.0000.00717.69
8.1.10.0070.00017.49
8.1.00.0040.00417.46
8.0.300.0040.00418.77
8.0.290.0030.00516.75
8.0.280.0070.00018.50
8.0.270.0000.00717.33
8.0.260.0060.00017.36
8.0.250.0030.00317.07
8.0.240.0000.00716.96
8.0.230.0030.00317.05
8.0.220.0030.00317.03
8.0.210.0030.00317.02
8.0.200.0030.00317.08
8.0.190.0000.00716.97
8.0.180.0080.00017.08
8.0.170.0000.00816.87
8.0.160.0070.00017.05
8.0.150.0040.00416.85
8.0.140.0000.00716.95
8.0.130.0000.00613.51
8.0.120.0070.00016.96
8.0.110.0000.00717.07
8.0.100.0000.00717.01
8.0.90.0040.00417.12
8.0.80.0090.01217.02
8.0.70.0000.00717.07
8.0.60.0000.00817.04
8.0.50.0000.00716.90
8.0.30.0090.01317.08
8.0.20.0140.00717.40
8.0.10.0030.00516.91
8.0.00.0080.01416.80
7.4.330.0000.00515.09
7.4.320.0030.00616.59
7.4.300.0030.00316.59
7.4.290.0050.00216.59
7.4.280.0080.00016.51
7.4.270.0000.00716.50
7.4.260.0030.00316.64
7.4.250.0000.00716.61
7.4.240.0030.00316.52
7.4.230.0030.00316.39
7.4.220.0060.01216.53
7.4.210.0070.01016.66
7.4.200.0050.00216.76
7.4.160.0160.00016.32
7.4.150.0110.00817.40
7.4.140.0080.01117.86
7.4.130.0030.01316.64
7.4.120.0110.00916.61
7.4.110.0140.00316.82
7.4.100.0130.00316.69
7.4.90.0040.01516.68
7.4.80.0090.00919.39
7.4.70.0130.00616.75
7.4.60.0120.00616.49
7.4.50.0040.00416.52
7.4.40.0100.00716.80
7.4.30.0100.01316.85
7.4.00.0070.01214.88
7.3.330.0050.00013.32
7.3.320.0030.00313.50
7.3.310.0030.00316.36
7.3.300.0060.00016.50
7.3.290.0050.01116.48
7.3.280.0120.01016.47
7.3.270.0090.00917.40
7.3.260.0070.01016.63
7.3.250.0100.00716.51
7.3.240.0080.00816.59
7.3.230.0000.01616.66
7.3.210.0120.00616.61
7.3.200.0070.01019.39
7.3.190.0060.01216.50
7.3.180.0080.00816.54
7.3.170.0100.00716.45
7.3.160.0080.00816.48
7.3.120.0060.01214.93
7.3.110.0140.00315.05
7.3.100.0030.00914.97
7.3.90.0030.01214.93
7.3.80.0090.00614.98
7.3.70.0100.00314.89
7.3.60.0090.00614.89
7.3.50.0060.00614.91
7.3.40.0090.00614.86
7.3.30.0060.00614.90
7.3.20.0060.00916.61
7.3.10.0040.01116.80
7.3.00.0100.00716.75
7.2.330.0030.01416.91
7.2.320.0150.00416.84
7.2.310.0040.01916.66
7.2.300.0030.01416.86
7.2.290.0080.01516.75
7.2.250.0000.01914.74
7.2.240.0120.00314.91
7.2.230.0060.00615.10
7.2.220.0130.00314.73
7.2.210.0000.00915.14
7.2.200.0000.01314.85
7.2.190.0040.00815.09
7.2.180.0000.00914.75
7.2.170.0070.01015.18
7.2.110.0000.01316.52
7.2.60.0140.00016.50
7.2.00.0060.00619.50
7.1.330.0030.01315.73
7.1.320.0030.01315.74
7.1.310.0110.00415.97
7.1.300.0070.00715.77
7.1.290.0070.01015.77
7.1.280.0080.00415.78
7.1.270.0070.00715.61
7.1.260.0100.00715.93
7.1.200.0000.01315.94
7.1.100.0000.01718.03
7.1.70.0000.00917.20
7.1.60.0070.01719.11
7.1.50.0130.01317.02
7.1.00.0100.07022.40
7.0.200.0060.00316.91
7.0.140.0030.07322.09
7.0.60.0070.08319.97
7.0.50.0000.04317.84
7.0.40.0100.06320.12
7.0.30.0570.06720.25
7.0.20.0330.05320.30
7.0.10.0170.08320.09
7.0.00.0170.07720.10
5.6.280.0070.07021.07
5.6.210.0100.08320.48
5.6.200.0070.07318.16
5.6.190.0100.08320.55
5.6.180.0300.07020.58
5.6.170.0270.04320.71
5.6.160.0030.04720.61
5.6.150.0100.08018.16
5.6.140.0100.04318.22
5.6.130.0100.07718.18
5.6.120.0070.08021.13
5.6.110.0170.07321.09
5.6.100.0070.04021.02
5.6.90.0000.05020.98
5.6.80.0030.04020.38
5.6.70.0030.08720.43
5.5.350.0130.08320.48
5.5.340.0100.08018.09
5.5.330.0170.07020.32
5.5.320.0270.04720.48
5.5.310.0300.05020.38
5.5.300.0030.05318.08
5.5.290.0130.07317.97
5.5.280.0070.06720.77
5.5.270.0100.03320.80
5.5.260.0030.04320.89
5.5.250.0030.05320.59
5.5.240.0300.04320.16
5.4.450.0930.05019.20
5.4.440.0670.05719.62
5.4.430.0700.06719.49
5.4.420.0800.06319.67
5.4.410.0670.06719.63
5.4.400.0770.04718.84
5.4.390.0970.06719.01
5.4.380.0430.06719.12
5.4.370.0800.04719.15
5.4.360.0630.06019.30
5.4.350.0770.06018.99
5.4.340.0080.03212.02
5.4.320.0060.03612.51
5.4.310.0070.03812.50
5.4.300.0050.03812.51
5.4.290.0050.04012.51
5.4.280.0060.03612.40
5.4.270.0070.03612.40
5.4.260.0040.03912.41
5.4.250.0050.03912.40
5.4.240.0040.03812.41
5.4.230.0080.03612.39
5.4.220.0130.03512.40
5.4.210.0080.03712.39
5.4.200.0040.04012.40
5.4.190.0040.03712.39
5.4.180.0060.03712.39
5.4.170.0080.03512.39
5.4.160.0030.04012.40
5.4.150.0080.03512.39
5.4.140.0060.03912.08
5.4.130.0060.03912.06
5.4.120.0070.03412.02
5.4.110.0050.03812.02
5.4.100.0070.03512.02
5.4.90.0060.04012.02
5.4.80.0070.03712.02
5.4.70.0040.03712.01
5.4.60.0050.03612.01
5.4.50.0060.03512.01
5.4.40.0040.03712.00
5.4.30.0040.03812.00
5.4.20.0090.03512.00
5.4.10.0060.03412.00
5.4.00.0030.03911.49
5.3.290.0120.03312.80
5.3.280.0060.03912.71
5.3.270.0020.04312.73
5.3.260.0060.03912.72
5.3.250.0060.03912.72
5.3.240.0060.03712.72
5.3.230.0080.04312.71
5.3.220.0100.04512.68
5.3.210.0100.05012.68
5.3.200.0120.03812.68
5.3.190.0080.03712.68
5.3.180.0060.03812.67
5.3.170.0070.03712.67
5.3.160.0080.03512.67
5.3.150.0070.03512.67
5.3.140.0090.03412.66
5.3.130.0100.03612.66
5.3.120.0070.03812.65
5.3.110.0090.03712.66
5.3.100.0050.03912.13
5.3.90.0070.03612.11
5.3.80.0060.03712.10
5.3.70.0070.03712.10
5.3.60.0060.03712.08
5.3.50.0050.03812.02
5.3.40.0090.03912.02
5.3.30.0050.03711.98
5.3.20.0030.03811.76
5.3.10.0060.03511.73
5.3.00.0110.03111.72
5.2.170.0040.0349.23
5.2.160.0040.0319.23
5.2.150.0050.0319.25
5.2.140.0090.0269.23
5.2.130.0030.0329.20
5.2.120.0060.0289.19
5.2.110.0040.0309.20
5.2.100.0080.0259.20
5.2.90.0080.0269.20
5.2.80.0060.0309.19
5.2.70.0030.0339.20
5.2.60.0070.0279.15
5.2.50.0050.0309.12
5.2.40.0060.0279.09
5.2.30.0060.0299.07
5.2.20.0060.0389.06
5.2.10.0070.0328.96
5.2.00.0080.0258.83
5.1.60.0070.0218.11
5.1.50.0060.0248.11
5.1.40.0040.0268.09
5.1.30.0060.0268.44
5.1.20.0050.0278.46
5.1.10.0040.0278.18
5.1.00.0040.0278.18
5.0.50.0060.0196.67
5.0.40.0070.0256.54
5.0.30.0040.0326.35
5.0.20.0050.0206.31
5.0.10.0020.0236.29
5.0.00.0060.0306.29
4.4.90.0040.0154.78
4.4.80.0030.0164.75
4.4.70.0040.0184.76
4.4.60.0050.0144.75
4.4.50.0050.0154.77
4.4.40.0040.0244.71
4.4.30.0040.0214.75
4.4.20.0030.0174.84
4.4.10.0030.0154.85
4.4.00.0000.0274.76
4.3.110.0030.0174.67
4.3.100.0020.0184.66
4.3.90.0030.0214.63
4.3.80.0050.0234.59
4.3.70.0020.0164.63
4.3.60.0030.0154.63
4.3.50.0020.0174.62
4.3.40.0050.0234.54
4.3.30.0030.0213.33
4.3.20.0030.0213.31
4.3.10.0050.0193.28
4.3.00.0000.0236.68

preferences:
31.06 ms | 400 KiB | 5 Q