3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f($var){ // not using references foreach($var as $k => $v){ unset($var[$k]); // shouldn't this unset from a copy?! } } print '<pre>'; print gettype($GLOBALS); f($GLOBALS); print gettype($GLOBALS);

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)
8.3.60.0120.00316.38
8.3.50.0120.00822.08
8.3.40.0090.00618.80
8.3.30.0030.01019.09
8.3.20.0050.00320.34
8.3.10.0050.00323.70
8.3.00.0080.00020.89
8.2.180.0090.01218.25
8.2.170.0090.00622.96
8.2.160.0080.00620.58
8.2.150.0060.00324.18
8.2.140.0040.00424.66
8.2.130.0060.01326.16
8.2.120.0050.00222.32
8.2.110.0030.00622.09
8.2.100.0080.00417.84
8.2.90.0060.00319.17
8.2.80.0060.00317.97
8.2.70.0060.00617.63
8.2.60.0050.00318.05
8.2.50.0040.00418.07
8.2.40.0050.00318.22
8.2.30.0030.00518.01
8.2.20.0000.00717.72
8.2.10.0080.00017.63
8.2.00.0020.00517.63
8.1.280.0040.01125.92
8.1.270.0040.00423.69
8.1.260.0080.00026.35
8.1.250.0040.00428.09
8.1.240.0030.00623.77
8.1.230.0040.00819.11
8.1.220.0040.00417.79
8.1.210.0040.00418.77
8.1.200.0110.00017.00
8.1.190.0040.00417.53
8.1.180.0040.00418.10
8.1.170.0060.00618.50
8.1.160.0030.00621.94
8.1.150.0040.00418.64
8.1.140.0060.00317.43
8.1.130.0000.00717.85
8.1.120.0030.00517.47
8.1.110.0000.00817.43
8.1.100.0000.00717.50
8.1.90.0060.00317.35
8.1.80.0000.00717.40
8.1.70.0030.00317.39
8.1.60.0060.00317.48
8.1.50.0080.00017.52
8.1.40.0000.00717.49
8.1.30.0040.00417.53
8.1.20.0000.01017.62
8.1.10.0040.00417.55
8.1.00.0080.00017.42
8.0.300.0070.00018.77
8.0.290.0000.00717.18
8.0.280.0040.00418.35
8.0.270.0000.00717.21
8.0.260.0000.00716.87
8.0.250.0030.00516.91
8.0.240.0040.00217.05
8.0.230.0070.00016.92
8.0.220.0000.00716.89
8.0.210.0030.00316.98
8.0.200.0030.00317.03
8.0.190.0000.00917.01
8.0.180.0040.00416.92
8.0.170.0040.00416.95
8.0.160.0030.00316.82
8.0.150.0000.00716.92
8.0.140.0080.00016.89
8.0.130.0030.00613.38
8.0.120.0030.00616.81
8.0.110.0000.00716.96
8.0.100.0040.00416.95
8.0.90.0050.00316.90
8.0.80.0110.00616.90
8.0.70.0040.00417.07
8.0.60.0000.00817.02
8.0.50.0040.00416.87
8.0.30.0080.01117.02
8.0.20.0120.00617.40
8.0.10.0000.00717.09
8.0.00.0140.00416.72
7.4.330.0050.00015.00
7.4.320.0000.00616.54
7.4.300.0000.00716.51
7.4.290.0000.00716.55
7.4.280.0040.00416.55
7.4.270.0040.00416.50
7.4.260.0070.00016.46
7.4.250.0050.00516.55
7.4.240.0040.00416.51
7.4.230.0030.00316.63
7.4.220.0090.00916.62
7.4.210.0060.00816.47
7.4.200.0070.00016.45
7.4.190.0000.00716.36
7.4.160.0090.01216.50
7.4.150.0070.01017.40
7.4.140.0120.00617.86
7.4.130.0090.00816.53
7.4.120.0110.01116.58
7.4.110.0040.01416.52
7.4.100.0100.00716.57
7.4.90.0140.00316.50
7.4.80.0090.01419.39
7.4.70.0040.01216.41
7.4.60.0090.00616.51
7.4.50.0020.00216.28
7.4.40.0050.00522.77
7.4.30.0130.00316.61
7.4.00.0060.01014.64
7.3.330.0030.00313.45
7.3.320.0000.00713.16
7.3.310.0030.00316.30
7.3.300.0030.00316.27
7.3.290.0070.01016.27
7.3.280.0100.01016.33
7.3.270.0100.00717.40
7.3.260.0100.01416.61
7.3.250.0090.00916.46
7.3.240.0150.00316.47
7.3.230.0130.00316.39
7.3.210.0070.01016.38
7.3.200.0160.00819.39
7.3.190.0130.01016.35
7.3.180.0100.00716.35
7.3.170.0040.01116.55
7.3.160.0090.00616.29
7.3.120.0090.00614.71
7.2.330.0150.00616.67
7.2.320.0160.00016.55
7.2.310.0060.01516.73
7.2.300.0140.00316.45
7.2.290.0100.00616.53
7.1.70.0000.00817.06
7.1.60.0030.02019.29
7.1.50.0120.01216.62
7.1.00.0100.07022.40
7.0.200.0100.01016.60
7.0.140.0100.06722.05
7.0.100.0170.04319.92
7.0.90.0070.08319.91
7.0.80.0170.06319.91
7.0.70.0030.04719.95
7.0.60.0100.06719.98
7.0.50.0100.06320.33
7.0.40.0070.08320.05
7.0.30.0100.08320.01
7.0.20.0030.04720.11
7.0.10.0070.08020.17
7.0.00.0130.06320.09
5.6.280.0070.07021.13
5.6.250.0030.04320.66
5.6.240.0200.06720.69
5.6.230.0100.04020.69
5.6.220.0030.08020.68
5.6.210.0100.07720.47
5.6.200.0100.07721.05
5.6.190.0100.06720.96
5.6.180.0130.07321.02
5.6.170.0070.08721.14
5.6.160.0070.08321.04
5.6.150.0100.06721.05
5.6.140.0030.06021.11
5.6.130.0130.07320.95
5.6.120.0070.04721.07
5.6.110.0130.07721.11
5.6.100.0070.05321.03
5.6.90.0030.05021.05
5.6.80.0000.07720.46
5.6.70.0130.07320.52
5.6.60.0100.05020.30
5.6.50.0030.08020.41
5.6.40.0030.07720.49
5.6.30.0100.07720.41
5.6.20.0200.06020.29
5.6.10.0070.08320.46
5.6.00.0000.06020.40
5.5.380.0030.05020.34
5.5.370.0070.03720.37
5.5.360.0030.07020.41
5.5.350.0070.07020.42
5.5.340.0100.07720.82
5.5.330.0170.07020.84
5.5.320.0130.07320.78
5.5.310.0100.05020.61
5.5.300.0070.06320.89
5.5.290.0100.08020.86
5.5.280.0030.08320.77
5.5.270.0070.09320.92
5.5.260.0030.08320.72
5.5.250.0130.07720.71
5.5.240.0030.07020.29
5.5.230.0130.07720.21
5.5.220.0100.05720.25
5.5.210.0070.07320.22
5.5.200.0070.07720.27
5.5.190.0070.07320.08
5.5.180.0100.07720.23
5.5.160.0000.04320.22
5.5.150.0170.07020.08
5.5.140.0000.06720.24
5.5.130.0070.05720.27
5.5.120.0100.07720.12
5.5.110.0030.08020.27
5.5.100.0130.06719.94
5.5.90.0130.06320.07
5.5.80.0070.07320.01
5.5.70.0000.08720.16
5.5.60.0070.08020.14
5.5.50.0030.08020.15
5.5.40.0170.07319.96
5.5.30.0030.06720.05
5.5.20.0070.08020.09
5.5.10.0030.07320.00
5.5.00.0170.07020.03
5.4.450.0000.08019.56
5.4.440.0070.07719.45
5.4.430.0070.06319.36
5.4.420.0000.08319.35
5.4.410.0000.05019.10
5.4.400.0130.07719.03
5.4.390.0070.04718.85
5.4.380.0130.03719.13
5.4.370.0100.04018.95
5.4.360.0130.07019.12
5.4.350.0100.06719.14
5.4.340.0130.07018.85
5.4.320.0130.06319.04
5.4.310.0070.07318.91
5.4.300.0100.07719.05
5.4.290.0070.04719.16
5.4.280.0070.06719.02
5.4.270.0070.07719.20
5.4.260.0100.07719.03
5.4.250.0070.04319.17
5.4.240.0070.05719.13
5.4.230.0030.03719.04
5.4.220.0170.06719.20
5.4.210.0030.06319.13
5.4.200.0170.06719.06
5.4.190.0130.06019.05
5.4.180.0100.07019.15
5.4.170.0030.05319.04
5.4.160.0030.07019.07
5.4.150.0070.07719.14
5.4.140.0170.05716.48
5.4.130.0200.03016.32
5.4.120.0030.07716.34
5.4.110.0030.07316.47
5.4.100.0070.07716.36
5.4.90.0100.05016.50
5.4.80.0100.06316.32
5.4.70.0100.06016.42
5.4.60.0100.06316.41
5.4.50.0070.06016.39
5.4.40.0030.06716.46
5.4.30.0000.06716.30
5.4.20.0100.06716.30
5.4.10.0130.06716.48
5.4.00.0070.04315.86
5.3.290.0030.07314.72
5.3.280.0030.04314.70
5.3.270.0000.08314.56
5.3.260.0130.03714.66
5.3.250.0030.04714.74
5.3.240.0100.03714.67
5.3.230.0030.06714.57
5.3.220.0000.06014.68
5.3.210.0030.07714.68
5.3.200.0100.07014.67
5.3.190.0030.04014.59
5.3.180.0030.07314.63
5.3.170.0100.07314.54
5.3.160.0070.06314.61
5.3.150.0130.05014.66
5.3.140.0100.06714.58
5.3.130.0130.03714.50
5.3.120.0100.06714.57
5.3.110.0130.04314.51
5.3.100.0100.07014.10
5.3.90.0030.07013.98
5.3.80.0100.04314.02
5.3.70.0200.04314.00
5.3.60.0030.07013.93
5.3.50.0000.06714.06
5.3.40.0000.07713.85
5.3.30.0100.07013.98
5.3.20.0130.05013.75
5.3.10.0000.06313.71
5.3.00.0030.04713.70
5.2.170.0070.03012.39
5.2.160.0000.04012.39
5.2.150.0070.06012.39
5.2.140.0070.06012.39
5.2.130.0070.02712.39
5.2.120.0000.04312.39
5.2.110.0200.04312.39
5.2.100.0030.04712.39
5.2.90.0030.03312.39
5.2.80.0000.05712.39
5.2.70.0030.05312.39
5.2.60.0030.06312.39
5.2.50.0030.03312.39
5.2.40.0100.05312.39
5.2.30.0070.05312.39
5.2.20.0070.03312.39
5.2.10.0070.06012.39
5.2.00.0070.05312.39
5.1.60.0030.03312.39
5.1.50.0000.03012.39
5.1.40.0200.02012.39
5.1.30.0100.05012.39
5.1.20.0030.04712.39
5.1.10.0100.05312.39
5.1.00.0070.04012.39
5.0.50.0030.03312.39
5.0.40.0030.03312.39
5.0.30.0030.04012.39
5.0.20.0030.04712.39
5.0.10.0030.04012.39
5.0.00.0030.06312.39
4.4.90.0000.03712.39
4.4.80.0100.02712.39
4.4.70.0030.03312.39
4.4.60.0100.02312.39
4.4.50.0000.04012.39
4.4.40.0100.02012.39
4.4.30.0030.03712.39
4.4.20.0030.03712.39
4.4.10.0000.02312.39
4.4.00.0070.05012.39
4.3.110.0070.03312.39
4.3.100.0070.03012.39
4.3.90.0070.03312.39
4.3.80.0000.05712.39
4.3.70.0030.01712.39
4.3.60.0000.03712.39
4.3.50.0030.03012.39
4.3.40.0030.03012.39
4.3.30.0070.02712.39
4.3.20.0000.02712.39
4.3.10.0070.02312.39
4.3.00.0000.02312.39

preferences:
66.21 ms | 401 KiB | 5 Q