3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var; echo 'before: '; var_dump($var); useRefs($var); echo 'after: '; var_dump($var); useRefs($var); echo 'last: '; var_dump($var); function useRefs(&$var) { if ($var === null) { $var = 'test'; } else { $var = null; } }

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)
8.3.60.0070.01116.50
8.3.50.0160.00521.26
8.3.40.0090.00618.78
8.3.30.0030.01019.09
8.3.20.0000.00720.13
8.3.10.0040.00423.35
8.3.00.0040.00419.66
8.2.180.0060.00916.50
8.2.170.0070.00722.96
8.2.160.0090.00920.34
8.2.150.0060.00324.18
8.2.140.0030.00524.66
8.2.130.0070.00326.16
8.2.120.0080.00019.52
8.2.110.0030.00720.38
8.2.100.0080.00419.76
8.2.90.0030.00619.08
8.2.80.0000.00817.97
8.2.70.0030.00617.50
8.2.60.0050.00318.04
8.2.50.0040.00418.07
8.2.40.0030.00619.91
8.2.30.0050.00217.92
8.2.20.0030.00617.59
8.2.10.0050.00218.00
8.2.00.0070.00017.93
8.1.280.0130.00625.92
8.1.270.0040.00420.23
8.1.260.0040.00426.35
8.1.250.0080.00028.09
8.1.240.0070.00323.88
8.1.230.0090.00318.97
8.1.220.0040.00417.74
8.1.210.0060.00318.77
8.1.200.0000.01117.23
8.1.190.0000.00717.40
8.1.180.0000.00718.63
8.1.170.0060.00318.65
8.1.160.0000.00822.18
8.1.150.0040.00418.53
8.1.140.0080.00017.30
8.1.130.0040.00417.82
8.1.120.0040.00417.43
8.1.110.0000.00717.38
8.1.100.0000.00717.39
8.1.90.0040.00417.27
8.1.80.0000.00717.41
8.1.70.0030.00317.25
8.1.60.0040.00417.59
8.1.50.0080.00017.53
8.1.40.0040.00417.58
8.1.30.0030.00617.53
8.1.20.0030.00717.50
8.1.10.0030.00517.40
8.1.00.0000.00817.44
8.0.300.0040.00418.77
8.0.290.0000.00717.18
8.0.280.0030.00318.50
8.0.270.0000.00717.31
8.0.260.0030.00317.25
8.0.250.0020.00516.99
8.0.240.0000.00717.01
8.0.230.0030.00316.94
8.0.220.0000.00716.77
8.0.210.0000.00716.80
8.0.200.0000.00616.95
8.0.190.0030.00516.95
8.0.180.0050.00316.95
8.0.170.0000.00816.88
8.0.160.0040.00316.97
8.0.150.0000.00716.78
8.0.140.0040.00416.80
8.0.130.0000.00813.27
8.0.120.0050.00316.83
8.0.110.0040.00416.76
8.0.100.0000.00816.88
8.0.90.0040.00416.75
8.0.80.0060.01216.89
8.0.70.0040.00416.84
8.0.60.0040.00416.68
8.0.50.0040.00416.90
8.0.30.0140.00617.05
8.0.20.0100.00917.40
8.0.10.0000.00716.96
8.0.00.0120.00716.82
7.4.330.0050.00015.07
7.4.320.0070.00016.50
7.4.300.0000.00616.45
7.4.290.0070.00016.50
7.4.280.0040.00416.52
7.4.270.0030.00316.57
7.4.260.0050.00516.41
7.4.250.0040.00416.52
7.4.240.0030.00316.47
7.4.230.0000.00716.48
7.4.220.0090.01216.36
7.4.210.0090.01016.61
7.4.200.0000.00816.69
7.4.160.0030.01216.59
7.4.150.0090.00617.40
7.4.140.0100.01017.86
7.4.130.0110.00916.47
7.4.120.0020.01516.47
7.4.110.0100.01316.52
7.4.100.0070.01416.38
7.4.90.0130.00316.56
7.4.80.0140.00319.39
7.4.70.0080.00816.36
7.4.60.0060.01016.64
7.4.50.0000.00816.39
7.4.40.0090.01416.47
7.4.30.0100.00716.41
7.4.00.0080.00914.87
7.3.330.0080.00013.38
7.3.320.0000.00513.22
7.3.310.0060.00016.41
7.3.300.0030.00516.31
7.3.290.0000.00716.32
7.3.280.0080.00916.35
7.3.270.0090.00917.40
7.3.260.0100.00616.68
7.3.250.0110.00816.52
7.3.240.0080.01616.27
7.3.230.0100.01016.54
7.3.210.0130.00316.55
7.3.200.0030.01419.39
7.3.190.0070.01016.30
7.3.180.0090.00916.20
7.3.170.0140.00416.34
7.3.160.0100.00516.39
7.3.120.0120.00614.66
7.3.110.0070.01115.00
7.3.100.0000.01615.00
7.3.90.0100.01014.97
7.3.80.0110.00614.85
7.3.70.0000.01514.59
7.3.60.0030.00614.79
7.3.50.0030.01014.68
7.3.40.0130.00314.86
7.3.30.0070.00714.89
7.3.20.0030.01316.81
7.3.10.0110.00316.78
7.3.00.0040.00416.83
7.2.330.0110.02716.49
7.2.320.0070.01116.63
7.2.310.0130.00316.32
7.2.300.0130.00316.32
7.2.290.0120.00616.34
7.2.250.0100.01015.11
7.2.240.0070.01015.19
7.2.230.0100.00715.15
7.2.220.0110.00015.12
7.2.210.0070.00715.15
7.2.200.0030.01215.00
7.2.190.0000.01514.82
7.2.180.0080.00815.03
7.2.170.0000.01415.03
7.2.00.0070.01119.57
7.1.330.0040.01115.93
7.1.320.0000.01115.67
7.1.310.0060.00615.97
7.1.300.0120.00415.81
7.1.290.0060.00615.74
7.1.280.0030.00715.80
7.1.270.0100.00615.76
7.1.260.0000.00915.62
7.1.100.0060.00618.00
7.1.70.0000.00917.14
7.1.60.0000.01017.37
7.1.50.0090.00616.96
7.1.00.0000.08022.28
7.0.200.0030.01316.68
7.0.60.0070.05719.90
7.0.50.0000.09017.73
7.0.40.0000.09020.04
7.0.30.0200.05020.30
7.0.20.0200.09320.22
7.0.10.0030.05320.05
7.0.00.0030.04320.05
5.6.280.0030.07321.11
5.6.210.0100.08020.50
5.6.200.0070.08318.27
5.6.190.0070.08720.52
5.6.180.0070.06320.55
5.6.170.0300.07320.58
5.6.160.0070.08720.54
5.6.150.0100.07018.25
5.6.140.0170.07318.13
5.6.130.0100.08318.18
5.6.120.0070.08021.02
5.6.110.0100.07721.01
5.6.100.0070.05021.00
5.6.90.0100.08021.02
5.6.80.0070.06720.29
5.5.350.0300.07720.45
5.5.340.0030.03717.99
5.5.330.0000.09020.40
5.5.320.0300.05320.27
5.5.310.0200.05020.36
5.5.300.0070.03718.07
5.5.290.0070.08017.98
5.5.280.0130.07320.97
5.5.270.0070.08020.80
5.5.260.0070.07320.84
5.5.250.0130.04320.77
5.5.240.0300.05720.04
5.4.450.1200.03319.39
5.4.440.0200.04019.17
5.4.430.0130.06319.61
5.4.420.0170.05319.39
5.4.410.0100.07018.94
5.4.400.0100.05318.49
5.4.390.0270.05318.56
5.4.380.0130.05018.68
5.4.370.0100.05318.77
5.4.360.0100.05018.45
5.4.350.0130.06718.73
5.4.340.0170.05018.65
5.4.320.0100.05318.73
5.4.310.0130.05018.71
5.4.300.0130.04718.82
5.4.290.0070.06018.72
5.4.280.0030.06018.58
5.4.270.0100.05018.62
5.4.260.0170.06018.81
5.4.250.0030.06018.76
5.4.240.0100.05318.84
5.4.230.0100.05018.48
5.4.220.0130.05318.76
5.4.210.0270.06018.68
5.4.200.0130.07016.62
5.4.190.0170.04318.76
5.4.180.0170.04718.74
5.4.170.0100.05318.47
5.4.160.0300.03018.82
5.4.150.0130.05018.44
5.4.140.0130.04716.28
5.4.130.0100.04716.19
5.4.120.0100.04716.28
5.4.110.0030.05316.43
5.4.100.0070.05716.22
5.4.90.0170.04316.27
5.4.80.0030.06016.26
5.4.70.0100.06016.19
5.4.60.0070.05016.25
5.4.50.0070.05016.29
5.4.40.0200.04316.38
5.4.30.0130.04716.21
5.4.20.0130.07016.17
5.4.10.0200.04016.19
5.4.00.0170.06015.68
5.3.290.0230.04714.84
5.3.280.0130.07014.64
5.3.270.0170.07014.64
5.3.260.0170.04714.72
5.3.250.0130.04714.81
5.3.240.0200.05314.62
5.3.230.0130.05714.57
5.3.220.0070.06014.66
5.3.210.0130.05014.54
5.3.200.0070.05314.77
5.3.190.0170.04314.62
5.3.180.0100.05014.54
5.3.170.0030.06014.79
5.3.160.0130.05314.68
5.3.150.0100.06714.71
5.3.140.0100.05714.53
5.3.130.0170.05014.58
5.3.120.0170.04714.66
5.3.110.0100.05314.57
5.3.100.0130.05714.25
5.3.90.0100.04714.09
5.3.80.0130.04714.12
5.3.70.0200.03714.07
5.3.60.0130.06714.20
5.3.50.0070.05014.14
5.3.40.0030.05313.96
5.3.30.0230.04714.00
5.3.20.0030.05713.80
5.3.10.0070.05313.87
5.3.00.0130.04713.68
5.2.170.0030.05011.27
5.2.160.0100.03711.13
5.2.150.0170.03011.34
5.2.140.0000.04711.20
5.2.130.0000.04711.12
5.2.120.0000.04711.30
5.2.110.0100.04311.21
5.2.100.0000.04711.14
5.2.90.0030.04711.30
5.2.80.0130.03311.10
5.2.70.0100.03711.12
5.2.60.0070.04011.15
5.2.50.0000.04711.06
5.2.40.0100.03711.03
5.2.30.0100.04010.96
5.2.20.0030.04310.97
5.2.10.0030.04010.95
5.2.00.0070.04010.77
5.1.60.0030.0339.98
5.1.50.0070.03710.10
5.1.40.0100.03010.08
5.1.30.0000.04310.53
5.1.20.0070.03710.56
5.1.10.0030.03710.25
5.1.00.0100.03310.14
5.0.50.0130.0278.66
5.0.40.0070.0308.54
5.0.30.0030.0478.22
5.0.20.0100.0278.32
5.0.10.0030.0338.35
5.0.00.0070.0408.18
4.4.90.0070.0205.88
4.4.80.0000.0235.91
4.4.70.0030.0205.93
4.4.60.0030.0205.87
4.4.50.0070.0175.94
4.4.40.0070.0335.98
4.4.30.0030.0235.88
4.4.20.0070.0205.97
4.4.10.0000.0305.92
4.4.00.0000.0406.03
4.3.110.0070.0205.86
4.3.100.0030.0205.85
4.3.90.0030.0205.78
4.3.80.0070.0305.83
4.3.70.0100.0175.80
4.3.60.0070.0205.90
4.3.50.0000.0235.88
4.3.40.0000.0405.82
4.3.30.0000.0274.55
4.3.20.0070.0204.51
4.3.10.0030.0234.50
4.3.00.0000.01315.60

preferences:
65.02 ms | 401 KiB | 5 Q