3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a1 = ['foo' => 'bar', 'bar' => 'baz']; $a2 = ['baz' => 'foo']; $a3 = []; var_dump(array_merge($a1, $a2)); var_dump(array_merge($a1, $a3));

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)
8.3.60.0180.00016.50
8.3.50.0090.00622.00
8.3.40.0040.01118.67
8.3.30.0140.00718.84
8.3.20.0070.00020.16
8.3.10.0040.00423.53
8.3.00.0050.00319.13
8.2.180.0120.00918.16
8.2.170.0070.01422.96
8.2.160.0110.00420.60
8.2.150.0000.00824.18
8.2.140.0060.00324.66
8.2.130.0040.00426.16
8.2.120.0000.00822.09
8.2.110.0060.00322.24
8.2.100.0040.00817.72
8.2.90.0050.00219.13
8.2.80.0060.00317.97
8.2.70.0000.01017.50
8.2.60.0090.00017.80
8.2.50.0060.00318.07
8.2.40.0000.00819.95
8.2.30.0000.00719.70
8.2.20.0070.00017.49
8.2.10.0020.00517.91
8.2.00.0040.00417.52
8.1.280.0090.00625.92
8.1.270.0030.00624.02
8.1.260.0000.00826.35
8.1.250.0000.00728.09
8.1.240.0060.00323.82
8.1.230.0080.00419.14
8.1.220.0000.00817.74
8.1.210.0050.00318.77
8.1.200.0030.00617.38
8.1.190.0040.00417.22
8.1.180.0040.00719.01
8.1.170.0050.00318.46
8.1.160.0000.00821.86
8.1.150.0040.00418.65
8.1.140.0040.00417.35
8.1.130.0000.00617.83
8.1.120.0000.00717.30
8.1.110.0000.00817.39
8.1.100.0040.00417.38
8.1.90.0030.00317.39
8.1.80.0050.00217.41
8.1.70.0030.00317.37
8.1.60.0050.00217.42
8.1.50.0040.00417.44
8.1.40.0050.00217.41
8.1.30.0030.00517.53
8.1.20.0080.00017.60
8.1.10.0050.00317.43
8.1.00.0070.00017.35
8.0.300.0000.00718.82
8.0.290.0000.00817.18
8.0.280.0040.00418.38
8.0.270.0030.00317.18
8.0.260.0030.00317.19
8.0.250.0030.00316.85
8.0.240.0030.00516.93
8.0.230.0030.00316.75
8.0.220.0000.00816.89
8.0.210.0040.00416.72
8.0.200.0060.00016.91
8.0.190.0030.00516.79
8.0.180.0040.00416.85
8.0.170.0030.00716.77
8.0.160.0040.00416.77
8.0.150.0080.00016.74
8.0.140.0040.00316.78
8.0.130.0000.00813.34
8.0.120.0040.00416.76
8.0.110.0000.00716.72
8.0.100.0050.00316.62
8.0.90.0070.00016.77
8.0.80.0080.00816.87
8.0.70.0040.00416.78
8.0.60.0070.00016.88
8.0.50.0000.00716.82
8.0.30.0040.01516.97
8.0.20.0110.00917.40
8.0.10.0000.00716.81
8.0.00.0070.01316.63
7.4.330.0020.00215.06
7.4.320.0060.00016.42
7.4.300.0000.00716.53
7.4.290.0000.00716.52
7.4.280.0000.00716.42
7.4.270.0070.00016.37
7.4.260.0060.00016.44
7.4.250.0020.00516.29
7.4.240.0000.00716.36
7.4.230.0030.00316.32
7.4.220.0120.00616.53
7.4.210.0080.00816.55
7.4.200.0000.00716.32
7.4.190.0000.00816.70
7.4.160.0150.00316.52
7.4.150.0120.00617.40
7.4.140.0120.00717.86
7.4.130.0140.00616.40
7.4.120.0110.00616.46
7.4.110.0060.01216.45
7.4.100.0140.00716.37
7.4.90.0130.00616.23
7.4.80.0040.01319.39
7.4.70.0040.01216.48
7.4.60.0120.00416.36
7.4.50.0000.00916.15
7.4.40.0160.00316.23
7.4.30.0160.00416.46
7.4.00.0060.01114.95
7.3.330.0000.00513.04
7.3.320.0000.00612.88
7.3.310.0040.00416.21
7.3.300.0040.00416.04
7.3.290.0060.00916.25
7.3.280.0150.00416.15
7.3.270.0030.01417.40
7.3.260.0150.00916.25
7.3.250.0090.01116.23
7.3.240.0110.00616.09
7.3.230.0120.00616.39
7.3.210.0060.01216.36
7.3.200.0180.00519.39
7.3.190.0110.00816.14
7.3.180.0000.01516.45
7.3.170.0160.00016.46
7.3.160.0100.01016.49
7.3.120.0090.00814.54
7.3.110.0070.00914.74
7.3.100.0080.01014.92
7.3.90.0050.01014.65
7.3.80.0120.00314.66
7.3.70.0060.00814.71
7.3.60.0080.00514.50
7.3.50.0030.01014.70
7.3.40.0020.01014.63
7.3.30.0020.01214.59
7.3.20.0090.00516.30
7.3.10.0050.00616.43
7.3.00.0070.00716.68
7.2.330.0090.00916.53
7.2.320.0130.00416.46
7.2.310.0090.01216.35
7.2.300.0080.00816.56
7.2.290.0040.01416.14
7.2.250.0070.01214.86
7.2.240.0040.01314.92
7.2.230.0050.01214.56
7.2.220.0030.00914.64
7.2.210.0050.01014.57
7.2.200.0110.00614.71
7.2.190.0050.00814.90
7.2.180.0060.00914.83
7.2.170.0070.00614.73
7.2.60.0040.00716.62
7.2.00.0000.01318.93
7.1.330.0040.00915.51
7.1.320.0050.00715.70
7.1.310.0100.00815.78
7.1.300.0020.00815.75
7.1.290.0080.00615.74
7.1.280.0060.00615.63
7.1.270.0040.00915.72
7.1.260.0050.00915.77
7.1.200.0030.00915.61
7.1.100.0000.01318.02
7.1.70.0050.00217.11
7.1.60.0040.01119.46
7.1.50.0060.01316.51
7.1.00.0100.07022.46
7.0.200.0040.00416.66
7.0.140.0030.07322.15
7.0.60.0070.07720.01
7.0.50.0070.06717.84
7.0.40.0030.09020.04
7.0.30.0300.07720.20
7.0.20.0230.04320.09
7.0.10.0230.05020.20
7.0.00.0130.07020.33
5.6.280.0030.07320.90
5.6.210.0170.06720.64
5.6.200.0070.04318.11
5.6.190.0070.09020.56
5.6.180.0030.04720.41
5.6.170.0170.04020.38
5.6.160.0100.05320.39
5.6.150.0030.05718.21
5.6.140.0130.06718.19
5.6.130.0130.08018.21
5.6.120.0130.08321.07
5.6.110.0070.07721.03
5.6.100.0000.08020.98
5.6.90.0000.04721.04
5.6.80.0000.06020.36
5.6.70.0270.05320.50
5.5.350.0030.08720.43
5.5.340.0000.05317.95
5.5.330.0200.07320.25
5.5.320.0100.06720.48
5.5.310.0230.07720.28
5.5.300.0000.04717.91
5.5.290.0070.08017.98
5.5.280.0000.04320.88
5.5.270.0230.06720.76
5.5.260.0100.08320.72
5.5.250.0030.07320.65
5.5.240.0130.06720.14
5.4.450.0100.06319.28
5.4.440.0200.04719.45
5.4.430.1070.05319.60
5.4.420.0730.00019.50
5.4.410.0100.05718.93
5.4.400.0270.05018.73
5.4.390.0270.04318.73
5.4.380.0200.05318.65
5.4.370.0070.03718.73
5.4.360.0170.03318.77
5.4.350.0050.03411.97
5.4.340.0050.03911.96
5.4.320.0070.04412.46
5.4.310.0050.04712.45
5.4.300.0060.04212.46
5.4.290.0090.05712.43
5.4.280.0100.05612.33
5.4.270.0110.05212.33
5.4.260.0150.06212.33
5.4.250.0080.05912.33
5.4.240.0120.04012.33
5.4.230.0050.05112.32
5.4.220.0080.03712.32
5.4.210.0110.04712.32
5.4.200.0170.05712.32
5.4.190.0120.09712.32
5.4.180.0080.06912.32
5.4.170.0080.05612.33
5.4.160.0140.04612.33
5.4.150.0110.04412.32
5.4.140.0070.03812.01
5.4.130.0100.03211.99
5.4.120.0050.03811.95
5.4.110.0050.03811.95
5.4.100.0060.03611.95
5.4.90.0090.03511.95
5.4.80.0060.04211.95
5.4.70.0100.05311.94
5.4.60.0130.05911.94
5.4.50.0130.05511.94
5.4.40.0100.05511.93
5.4.30.0100.04511.93
5.4.20.0060.04111.93
5.4.10.0090.03511.93
5.4.00.0080.05611.42
5.3.290.0070.03912.80
5.3.280.0110.03812.71
5.3.270.0110.05412.73
5.3.260.0090.05512.72
5.3.250.0040.05512.72
5.3.240.0130.04812.71
5.3.230.0200.10112.71
5.3.220.0220.06012.68
5.3.210.0100.06612.68
5.3.200.0160.04212.68
5.3.190.0090.04512.67
5.3.180.0070.04712.68
5.3.170.0120.06212.67
5.3.160.0080.04412.67
5.3.150.0130.04812.67
5.3.140.0050.04412.66
5.3.130.0050.04212.66
5.3.120.0080.05012.66
5.3.110.0060.04412.66
5.3.100.0090.03812.12
5.3.90.0110.03412.08
5.3.80.0100.04912.07
5.3.70.0080.05712.08
5.3.60.0140.06412.06
5.3.50.0110.06212.00
5.3.40.0130.07212.00
5.3.30.0120.05411.95
5.3.20.0150.06511.73
5.3.10.0110.05811.70
5.3.00.0150.05411.68
5.2.170.0090.0519.18
5.2.160.0130.0599.18
5.2.150.0240.0989.18
5.2.140.0170.0519.19
5.2.130.0150.0489.15
5.2.120.0090.0499.14
5.2.110.0070.0479.15
5.2.100.0050.0509.14
5.2.90.0090.0469.14
5.2.80.0050.0699.14
5.2.70.0140.0489.14
5.2.60.0120.0569.09
5.2.50.0200.0499.05
5.2.40.0060.0429.03
5.2.30.0060.0509.01
5.2.20.0060.0399.00
5.2.10.0090.0458.92
5.2.00.0090.0458.79
5.1.60.0100.0368.07
5.1.50.0050.0358.07
5.1.40.0080.0258.04
5.1.30.0060.0378.40
5.1.20.0160.0358.42
5.1.10.0070.0398.14
5.1.00.0070.0418.14
5.0.50.0110.0266.62
5.0.40.0080.0446.48
5.0.30.0060.0566.29
5.0.20.0040.0296.27
5.0.10.0080.0306.24
5.0.00.0030.0346.23
4.4.90.0020.0244.78
4.4.80.0030.0244.75
4.4.70.0050.0164.75
4.4.60.0060.0144.75
4.4.50.0020.0184.77
4.4.40.0050.0384.71
4.4.30.0040.0204.76
4.4.20.0060.0124.84
4.4.10.0050.0134.85
4.4.00.0020.0354.76
4.3.110.0060.0204.67
4.3.100.0010.0184.67
4.3.90.0050.0144.63
4.3.80.0040.0254.58
4.3.70.0020.0164.63
4.3.60.0020.0174.63
4.3.50.0150.0484.63
4.3.40.0030.0334.54
4.3.30.0000.0243.29
4.3.20.0010.0233.26
4.3.10.0040.0163.22
4.3.00.0200.0236.66

preferences:
37.93 ms | 401 KiB | 5 Q