3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array('052' => 'nanana'); $b = array('042' => 'wayne'); $c = array(42 => 'batman'); $d = array('0fail' => 'bruce'); var_dump(array_merge($a, $b)); var_dump(array_merge($a, $c)); var_dump(array_merge($a, $d));

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)
7.2.60.0040.00816.55
7.2.00.0000.01119.28
7.1.200.0090.00615.73
7.1.100.0090.00617.95
7.1.70.0050.00216.96
7.1.60.0170.00719.46
7.1.50.0040.01916.94
7.1.00.0000.08022.54
7.0.200.0120.00014.92
7.0.140.0070.04022.05
7.0.110.0600.07719.99
7.0.100.0270.07719.89
7.0.90.0530.07020.01
7.0.80.0600.07320.05
7.0.70.0530.08020.05
7.0.60.0600.08020.00
7.0.50.0530.05720.23
7.0.40.0230.07019.96
7.0.30.0100.07720.19
7.0.20.0070.09020.24
7.0.10.0100.08320.18
7.0.00.0100.07720.24
5.6.280.0000.07721.15
5.6.260.0000.08320.59
5.6.250.0070.06720.61
5.6.240.0030.07720.57
5.6.230.0070.07320.65
5.6.220.0070.07320.63
5.6.210.0070.08020.61
5.6.200.0170.07320.95
5.6.190.0070.08321.10
5.6.180.0030.08721.10
5.6.170.0200.07021.28
5.6.160.0070.08021.26
5.6.150.0070.04720.93
5.6.140.0070.07721.26
5.6.130.0170.07720.91
5.6.120.0070.08721.13
5.6.110.0100.08020.94
5.6.100.0070.08021.17
5.6.90.0030.08021.02
5.6.80.0100.05020.52
5.6.70.0030.08320.59
5.6.60.0070.07320.46
5.6.50.0030.08320.65
5.6.40.0070.06320.44
5.6.30.0100.07320.34
5.6.20.0030.06720.46
5.6.10.0070.08020.33
5.6.00.0000.06720.47
5.5.380.0100.07320.38
5.5.370.0170.03720.41
5.5.360.0070.07020.55
5.5.350.0070.05020.45
5.5.340.0100.07720.83
5.5.330.0070.08020.97
5.5.320.0100.08320.98
5.5.310.0130.07020.89
5.5.300.0100.07720.95
5.5.290.0070.08020.84
5.5.280.0030.04020.93
5.5.270.0030.07720.84
5.5.260.0130.08020.68
5.5.250.0200.06720.79
5.5.240.0170.07020.33
5.5.230.0100.07720.14
5.5.220.0030.07320.04
5.5.210.0000.09020.25
5.5.200.0070.07320.38
5.5.190.0100.07020.04
5.5.180.0170.04320.33
5.5.160.0030.04020.15
5.5.150.0070.03720.11
5.5.140.0100.03320.37
5.5.130.0070.03720.11
5.5.120.0070.03720.25
5.5.110.0000.04020.14
5.5.100.0030.04720.22
5.5.90.0100.03020.13
5.5.80.0070.03720.24
5.5.70.0070.03720.25
5.5.60.0030.04320.02
5.5.50.0030.05019.99
5.5.40.0170.06020.20
5.5.30.0000.07720.23
5.5.20.0070.03320.08
5.5.10.0070.06020.03
5.5.00.0070.03320.09
5.4.450.0070.08319.41
5.4.440.0070.07719.57
5.4.430.0100.07319.32
5.4.420.0030.08019.44
5.4.410.0170.06719.18
5.4.400.0100.04019.08
5.4.390.0070.08019.00
5.4.380.0170.07019.12
5.4.370.0070.04319.05
5.4.360.0070.05718.93
5.4.350.0070.08019.27
5.4.340.0100.03319.00
5.4.320.0070.03719.27
5.4.310.0100.03719.27
5.4.300.0030.03718.93
5.4.290.0030.03718.98
5.4.280.0000.04018.92
5.4.270.0000.04019.07
5.4.260.0000.04018.95
5.4.250.0070.03719.12
5.4.240.0100.03018.94
5.4.230.0000.05319.11
5.4.220.0070.06719.13
5.4.210.0130.05718.96
5.4.200.0070.03319.16
5.4.190.0030.07019.00
5.4.180.0030.05319.02
5.4.170.0000.04018.97
5.4.160.0070.03719.25
5.4.150.0000.04719.14
5.4.140.0030.03716.23
5.4.130.0070.03316.52
5.4.120.0000.03716.47
5.4.110.0000.07016.19
5.4.100.0030.03316.41
5.4.90.0030.03716.48
5.4.80.0000.04016.51
5.4.70.0000.03716.51
5.4.60.0030.03716.30
5.4.50.0030.03316.10
5.4.40.0030.04316.52
5.4.30.0070.03316.25
5.4.20.0070.04316.20
5.4.10.0030.05716.33
5.4.00.0000.04015.70
5.3.290.0070.03314.76
5.3.280.0070.03014.52
5.3.270.0030.03714.43
5.3.260.0070.04714.61
5.3.250.0000.04014.54
5.3.240.0070.07314.48
5.3.230.0030.05014.43
5.3.220.0070.04314.45
5.3.210.0030.03714.36
5.3.200.0030.06014.58
5.3.190.0070.03314.43
5.3.180.0030.03714.42
5.3.170.0100.03014.35
5.3.160.0030.03714.62
5.3.150.0070.05314.50
5.3.140.0030.03714.34
5.3.130.0000.04014.49
5.3.120.0030.03714.37
5.3.110.0000.03714.55
5.3.100.0030.03313.98
5.3.90.0070.03313.96
5.3.80.0030.03713.90
5.3.70.0100.02713.95
5.3.60.0000.05013.83
5.3.50.0030.03314.00
5.3.40.0000.04314.04
5.3.30.0000.03713.96
5.3.20.0030.05313.61
5.3.10.0070.03013.71
5.3.00.0000.03713.65
5.2.170.0000.04312.43
5.2.160.0000.03012.43
5.2.150.0070.02312.43
5.2.140.0030.03012.43
5.2.130.0000.04012.43
5.2.120.0000.03312.43
5.2.110.0030.02712.43
5.2.100.0000.03012.43
5.2.90.0030.02712.43
5.2.80.0070.05712.43
5.2.70.0070.03012.43
5.2.60.0000.03312.43
5.2.50.0030.05012.43
5.2.40.0030.06312.43
5.2.30.0070.05312.43
5.2.20.0070.06012.43
5.2.10.0100.05712.43
5.2.00.0030.06012.43
5.1.60.0030.05312.43
5.1.50.0030.04012.43
5.1.40.0030.05312.43
5.1.30.0030.03712.43
5.1.20.0100.04312.43
5.1.10.0130.04312.43
5.1.00.0030.05312.43
5.0.50.0070.02712.43
5.0.40.0070.04312.43
5.0.30.0070.06712.43
5.0.20.0030.04712.43
5.0.10.0030.04312.43
5.0.00.0100.05312.43
4.4.90.0000.02012.43
4.4.80.0000.01312.43
4.4.70.0000.03312.43
4.4.60.0100.02712.43
4.4.50.0000.04012.43
4.4.40.0000.05712.43
4.4.30.0030.02012.43
4.4.20.0030.02712.43
4.4.10.0070.03312.43
4.4.00.0000.04712.43
4.3.110.0030.03312.43
4.3.100.0030.03312.43
4.3.90.0130.02312.43
4.3.80.0030.05012.43
4.3.70.0000.03312.43
4.3.60.0000.03012.43
4.3.50.0000.03312.43
4.3.40.0000.05012.43
4.3.30.0000.03312.43
4.3.20.0000.03712.43
4.3.10.0030.02312.43
4.3.00.0000.02012.43