3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string); for ($i = 0; $i < round($strLength / 2); $i++) { var_dump($strLength-$i); var_dump($strLength / 2-$i); $substr1 .= $string[$strLength-$i]; $substr2 .= $string[$strLength / 2 - $i]; } //var_dump($substr1); //var_dump($substr2); return $string = $substr1.$substr2; } var_dump(reverse('12345'));
based on Ur266

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).
Note: hhvm uses a JIT which only kicks in after a few runs. Since we run scripts only once, hhvm always runs slower.

VersionSystem time (s)User time (s)Memory (MiB)
7.2.60.0000.01216.95
7.2.00.0030.00919.20
7.1.200.0060.00315.97
7.1.100.0070.00317.69
7.1.70.0000.00817.29
7.1.60.0040.00717.11
7.1.50.0090.01516.98
7.1.00.0030.07722.45
7.0.200.0070.01016.83
7.0.140.0070.06721.92
7.0.110.0270.05020.01
7.0.100.0100.07720.03
7.0.90.0130.07319.91
7.0.80.0100.08319.85
7.0.70.0070.08719.97
7.0.60.0170.07019.93
7.0.50.0070.05020.25
7.0.40.0030.05020.23
7.0.30.0000.05720.15
7.0.20.0070.05720.03
7.0.10.0000.07019.95
7.0.00.0100.05020.11
5.6.260.0100.07720.63
5.6.250.0070.04720.54
5.6.240.0100.08320.66
5.6.230.0130.08020.65
5.6.220.0130.07720.48
5.6.210.0130.07020.63
5.6.200.0130.08021.12
5.6.190.0170.06320.99
5.6.180.0070.04720.93
5.6.170.0070.05021.09
5.6.160.0070.04021.29
5.6.150.0070.04021.14
5.6.140.0030.04321.29
5.6.130.0030.04321.14
5.6.120.0030.04021.08
5.6.110.0100.03720.93
5.6.100.0000.04320.93
5.6.90.0170.03320.92
5.6.80.0070.08020.54
5.6.70.0100.05720.52
5.6.60.0000.04320.66
5.6.50.0030.06720.57
5.6.40.0070.04720.65
5.6.30.0000.05020.51
5.6.20.0100.03320.64
5.6.10.0100.04720.64
5.6.00.0100.03320.39
5.5.380.0170.07020.31
5.5.370.0030.08320.18
5.5.360.0130.07720.52
5.5.350.0100.07320.40
5.5.340.0100.07320.89
5.5.330.0030.05020.70
5.5.320.0000.09020.75
5.5.310.0030.04320.81
5.5.300.0100.04320.70
5.5.290.0030.04320.74
5.5.280.0030.05020.87
5.5.270.0070.03320.73
5.5.260.0000.06721.03
5.5.250.0000.04720.54
5.5.240.0070.03720.23
5.5.230.0100.06720.41
5.5.220.0070.03320.34
5.5.210.0000.05320.40
5.5.200.0070.03320.12
5.5.190.0070.05320.05
5.5.180.0070.07720.13
5.5.160.0130.05720.30
5.5.150.0030.03720.23
5.5.140.0030.04020.25
5.5.130.0030.04020.23
5.5.120.0000.04020.04
5.5.110.0030.03720.29
5.5.100.0000.04320.21
5.5.90.0030.04720.07
5.5.80.0030.04020.25
5.5.70.0070.03720.00
5.5.60.0070.04319.98
5.5.50.0030.04019.97
5.5.40.0030.03720.18
5.5.30.0100.03320.23
5.5.20.0030.04020.11
5.5.10.0100.04319.92
5.5.00.0070.03320.03
5.4.450.0000.04319.34
5.4.440.0070.07319.50
5.4.430.0070.03719.55
5.4.420.0030.03719.57
5.4.410.0030.07319.56
5.4.400.0030.07019.05
5.4.390.0070.03319.18
5.4.380.0130.06719.02
5.4.370.0030.06319.31
5.4.360.0100.06019.24
5.4.350.0070.04019.33
5.4.340.0130.03319.15
5.4.320.0000.04319.05
5.4.310.0030.04719.14
5.4.300.0030.07319.01
5.4.290.0030.04019.05
5.4.280.0070.03319.01
5.4.270.0070.03319.22
5.4.260.0070.04019.24
5.4.250.0070.03719.04
5.4.240.0070.03719.30
5.4.230.0030.04319.23
5.4.220.0000.04019.03
5.4.210.0030.03719.14
5.4.200.0000.04019.02
5.4.190.0070.03719.05
5.4.180.0030.04319.06
5.4.170.0070.03719.32
5.4.160.0030.04719.06
5.4.150.0030.06319.05
5.4.140.0070.05716.34
5.4.130.0030.04716.48
5.4.120.0100.02716.49
5.4.110.0070.07716.52
5.4.100.0030.04016.58
5.4.90.0070.07316.57
5.4.80.0030.06316.56
5.4.70.0030.05316.55
5.4.60.0030.06716.54
5.4.50.0030.06316.42
5.4.40.0100.06316.50
5.4.30.0030.07016.53
5.4.20.0070.07716.64
5.4.10.0130.06316.29
5.4.00.0100.07015.77
5.3.290.0000.04714.76
5.3.280.0070.04014.62
5.3.270.0030.05014.63
5.3.260.0030.03714.63
5.3.250.0070.03014.83
5.3.240.0030.03314.73
5.3.230.0130.06014.61
5.3.220.0000.07714.63
5.3.210.0030.08014.75
5.3.200.0070.04314.66
5.3.190.0070.04314.50
5.3.180.0030.04714.70
5.3.170.0070.07014.54
5.3.160.0170.06714.75
5.3.150.0130.04714.55
5.3.140.0070.07714.70
5.3.130.0000.08314.62
5.3.120.0130.07014.68
5.3.110.0130.06714.78
5.3.100.0030.07313.96
5.3.90.0030.08014.21
5.3.80.0070.07714.24
5.3.70.0030.04313.93
5.3.60.0070.08013.86
5.3.50.0130.07013.95
5.3.40.0070.07013.92
5.3.30.0100.03714.14
5.3.20.0130.06713.70
5.3.10.0070.03713.66
5.3.00.0000.07713.76
5.2.170.0030.06311.89
5.2.160.0070.05311.89
5.2.150.0000.06711.89
5.2.140.0000.04011.89
5.2.130.0030.06011.89
5.2.120.0030.03711.89
5.2.110.0030.06011.89
5.2.100.0070.04011.89
5.2.90.0030.03011.89
5.2.80.0070.06011.89
5.2.70.0030.06011.89
5.2.60.0030.04011.89
5.2.50.0100.05711.89
5.2.40.0170.04711.89
5.2.30.0030.06311.89
5.2.20.0000.06711.89
5.2.10.0070.05311.89
5.2.00.0130.03711.89
5.1.60.0030.05011.89
5.1.50.0030.05311.89
5.1.40.0130.04311.89
5.1.30.0030.05711.89
5.1.20.0000.03711.89
5.1.10.0070.05311.89
5.1.00.0130.04711.89
5.0.50.0030.04011.89
5.0.40.0070.04011.89
5.0.30.0030.06311.89
5.0.20.0070.04011.89
5.0.10.0130.03011.89
5.0.00.0070.05011.89
4.4.90.0000.03311.89
4.4.80.0070.03011.89
4.4.70.0030.03311.89
4.4.60.0030.01711.89
4.4.50.0070.03011.89
4.4.40.0070.04711.89
4.4.30.0070.02311.89
4.4.20.0070.03011.89
4.4.10.0030.03711.89
4.4.00.0030.05311.89
4.3.110.0030.03711.89
4.3.100.0070.01711.89
4.3.90.0100.02311.89
4.3.80.0000.05311.89
4.3.70.0070.03011.89
4.3.60.0030.03311.89
4.3.50.0030.02311.89
4.3.40.0100.04711.89
4.3.30.0000.04011.89
4.3.20.0030.02311.89
4.3.10.0000.03711.89
4.3.00.0000.03711.89