3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = 1; a($b); function a($a){ debug_zval_dump($a);//refcount=4 why not 3?? xdebug_debug_zval('a');//refcount=3 why not 2?? }

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)
8.3.60.0090.00616.61
8.3.50.0100.00917.31
8.3.40.0070.01018.43
8.3.30.0090.00618.37
8.3.20.0040.00418.54
8.3.10.0080.00018.41
8.3.00.0080.00018.96
8.2.180.0100.00616.32
8.2.170.0040.01122.96
8.2.160.0000.01418.71
8.2.150.0080.00024.18
8.2.140.0040.00424.66
8.2.130.0030.00526.16
8.2.120.0070.00720.73
8.2.110.0030.00722.20
8.2.100.0080.00417.78
8.2.90.0000.00819.10
8.2.80.0000.00817.97
8.2.70.0030.00517.38
8.2.60.0040.00417.80
8.2.50.0000.00817.93
8.2.40.0000.00819.95
8.2.30.0040.00417.63
8.2.20.0060.00617.54
8.2.10.0040.00417.52
8.2.00.0050.00317.49
8.1.280.0140.00025.92
8.1.270.0030.00623.99
8.1.260.0000.00726.35
8.1.250.0040.00428.09
8.1.240.0060.00623.87
8.1.230.0070.00322.13
8.1.220.0000.00817.74
8.1.210.0040.00418.77
8.1.200.0030.00617.35
8.1.190.0030.00617.23
8.1.180.0040.00418.10
8.1.170.0000.00817.62
8.1.160.0000.00719.06
8.1.150.0040.00418.61
8.1.140.0040.00417.33
8.1.130.0040.00417.75
8.1.120.0040.00417.30
8.1.110.0000.00717.27
8.1.100.0000.00717.26
8.1.90.0050.00317.38
8.1.80.0050.00317.27
8.1.70.0030.00517.34
8.1.60.0040.00417.56
8.1.50.0000.00717.36
8.1.40.0000.00817.38
8.1.30.0060.00317.63
8.1.20.0060.00317.55
8.1.10.0060.00317.35
8.1.00.0040.00417.43
8.0.300.0050.00218.77
8.0.290.0030.00616.63
8.0.280.0030.00318.61
8.0.270.0040.00417.13
8.0.260.0030.00316.76
8.0.250.0080.00016.92
8.0.240.0000.00816.86
8.0.230.0030.00316.79
8.0.220.0000.00716.74
8.0.210.0040.00416.83
8.0.200.0000.00616.90
8.0.190.0000.00716.79
8.0.180.0040.00416.72
8.0.170.0040.00416.68
8.0.160.0000.00716.82
8.0.150.0030.00516.77
8.0.140.0030.00716.81
8.0.130.0000.00513.24
8.0.120.0030.00716.75
8.0.110.0040.00416.87
8.0.100.0070.00016.75
8.0.90.0040.00416.84
8.0.80.0060.00916.79
8.0.70.0020.00516.85
8.0.60.0000.00716.70
8.0.50.0000.00716.68
8.0.30.0120.00916.96
8.0.20.0110.00817.13
8.0.10.0030.00416.79
8.0.00.0040.01716.66
7.4.330.0020.00212.90
7.4.320.0000.00716.43
7.4.300.0030.00316.48
7.4.290.0070.00016.48
7.4.280.0000.00816.63
7.4.270.0000.00716.58
7.4.260.0050.00013.31
7.4.250.0080.00016.57
7.4.240.0040.00416.51
7.4.230.0040.00416.38
7.4.220.0130.00316.49
7.4.210.0060.00916.68
7.4.200.0030.00316.56
7.4.190.0030.00316.70
7.4.160.0040.01116.51
7.4.150.0140.00416.44
7.4.140.0110.02316.26
7.4.130.0030.01416.32
7.4.120.0100.00716.52
7.4.110.0140.00416.47
7.4.100.0130.00316.51
7.4.90.0030.01516.52
7.4.80.0050.01519.39
7.4.70.0120.00516.55
7.4.60.0030.01316.40
7.4.50.0080.00416.24
7.4.40.0100.00616.50
7.4.30.0040.01116.52
7.4.00.0030.01314.62
7.3.330.0030.00313.10
7.3.320.0000.00513.07
7.3.310.0070.00016.10
7.3.300.0070.00016.15
7.3.290.0060.00816.20
7.3.280.0070.01016.18
7.3.270.0120.01216.31
7.3.260.0130.01016.35
7.3.250.0160.00516.40
7.3.240.0100.00716.24
7.3.230.0090.00916.49
7.3.210.0100.00716.24
7.3.200.0120.00616.29
7.3.190.0100.01016.30
7.3.180.0090.00916.45
7.3.170.0130.00316.45
7.3.160.0070.01016.16
7.3.120.0070.00714.67
7.3.10.0120.00316.57
7.3.00.0060.00616.74
7.2.330.0140.01016.52
7.2.320.0130.00716.57
7.2.310.0070.01216.42
7.2.300.0130.00916.17
7.2.290.0130.00416.63
7.2.130.0060.00916.68
7.2.120.0040.01116.73
7.2.110.0060.00916.84
7.2.100.0080.00416.47
7.2.90.0070.00716.89
7.2.80.0040.01216.38
7.2.70.0000.01316.39
7.2.60.0080.00316.56
7.2.50.0070.01016.72
7.2.40.0030.00816.84
7.2.30.0000.01316.68
7.2.20.0100.00316.77
7.2.10.0060.00916.58
7.2.00.0090.00316.71
7.1.250.0030.01015.76
7.1.200.0060.00615.86
7.1.100.0000.01118.40
7.1.70.0040.00416.87
7.1.60.0100.01419.30
7.1.50.0040.01816.78
7.1.00.0030.07722.33
7.0.200.0070.00716.70
7.0.140.0000.07722.18
7.0.120.0070.07021.96
7.0.60.0070.07719.78
7.0.50.0030.08717.95
7.0.40.0030.04320.24
7.0.30.0670.06720.07
7.0.20.0270.08320.26
7.0.10.0170.08020.20
7.0.00.0130.07720.23
5.6.280.0130.06320.90
5.6.210.0030.06720.48
5.6.200.0070.07318.13
5.6.190.0070.05020.50
5.6.180.4130.03720.57
5.6.170.0300.07320.54
5.6.160.0070.08020.44
5.6.150.0000.07018.17
5.6.140.0070.08018.18
5.6.130.0030.04718.17
5.6.120.0170.07721.05
5.6.110.0000.05021.04
5.6.100.0100.08021.05
5.6.90.0170.08021.04
5.6.80.0030.05020.42
5.5.350.4230.03720.35
5.5.340.0030.04018.02
5.5.330.0030.04320.25
5.5.320.0300.03320.34
5.5.310.0270.08020.27
5.5.300.0070.08017.98
5.5.290.0070.05318.01
5.5.280.0030.04020.88
5.5.270.0100.05020.84
5.5.260.0030.08720.71
5.5.250.0130.07720.66
5.5.240.0300.06720.16
5.4.450.0100.06019.47
5.4.440.0000.08719.44
5.4.430.0100.04719.57
5.4.420.0030.06719.17
5.4.410.0000.04319.34
5.4.400.0070.03319.24
5.4.390.0070.03719.08
5.4.380.0000.04019.12
5.4.370.0030.06019.16
5.4.360.0030.03719.20
5.4.350.0000.04019.01
5.4.340.0030.03718.86
5.4.320.0030.04019.08
5.4.310.0070.03319.18
5.4.300.0030.03719.25
5.4.290.0070.03319.24
5.4.280.0030.04018.86
5.4.270.0070.03318.85
5.4.260.0070.03719.14
5.4.250.0030.03718.84
5.4.240.0000.04018.88
5.4.230.0000.05019.14
5.4.220.0070.03319.14
5.4.210.0100.03018.91
5.4.200.0100.03018.84
5.4.190.0070.05318.84
5.4.180.0070.06318.86
5.4.170.0030.05719.13
5.4.160.0170.06718.96
5.4.150.0000.04318.96
5.4.140.0000.04316.30
5.4.130.0130.06716.39
5.4.120.0030.05716.35
5.4.110.0130.06316.34
5.4.100.0070.07316.38
5.4.90.0070.07316.51
5.4.80.0070.07316.29
5.4.70.0070.07016.46
5.4.60.0100.06716.26
5.4.50.0130.05316.25
5.4.40.0070.05016.31
5.4.30.0030.04316.31
5.4.20.0170.06016.34
5.4.10.0030.03716.31
5.4.00.0070.03715.77
5.3.290.0030.03714.82
5.3.280.0030.04314.52
5.3.270.0030.07714.75
5.3.260.0100.07714.67
5.3.250.0030.06014.52
5.3.240.0030.07014.66
5.3.230.0070.06014.64
5.3.220.0030.06014.72
5.3.210.0030.07014.73
5.3.200.0070.07314.73
5.3.190.0130.03714.57
5.3.180.0000.04314.57
5.3.170.0030.04014.61
5.3.160.0070.05314.59
5.3.150.0130.06014.56
5.3.140.0170.06714.61
5.3.130.0070.05314.49
5.3.120.0100.04714.59
5.3.110.0070.06014.62
5.3.100.0030.05014.20
5.3.90.0130.06314.05
5.3.80.0130.06313.98
5.3.70.0130.06313.90
5.3.60.0000.04014.05
5.3.50.0000.04013.99
5.3.40.0000.04313.95
5.3.30.0030.07314.07
5.3.20.0100.06013.70
5.3.10.0070.03313.82
5.3.00.0030.04313.77
5.2.170.0070.02711.19
5.2.160.0030.03011.03
5.2.150.0030.06311.14
5.2.140.0030.06711.21
5.2.130.0070.03711.10
5.2.120.0100.06011.19
5.2.110.0070.06011.09
5.2.100.0130.05711.06
5.2.90.0070.03011.05
5.2.80.0030.06011.14
5.2.70.0000.04011.16
5.2.60.0030.05311.12
5.2.50.0030.06310.94
5.2.40.0070.03011.06
5.2.30.0030.03011.00
5.2.20.0000.03311.01
5.2.10.0100.05711.01
5.2.00.0030.03710.77
5.1.60.0000.0539.94
5.1.50.0000.06010.14
5.1.40.0070.02710.12
5.1.30.0070.05310.26
5.1.20.0030.06010.40
5.1.10.0000.06010.13
5.1.00.0030.03710.03
5.0.50.0070.0438.70
5.0.40.0030.0408.46
5.0.30.0030.0338.17
5.0.20.0070.0378.11
5.0.10.0030.0338.16
5.0.00.0030.0608.11
4.4.90.0030.0178.10
4.4.80.0000.0238.10
4.4.70.0030.0178.10
4.4.60.0030.0308.10
4.4.50.0070.0308.10
4.4.40.0030.0408.10
4.4.30.0000.0308.10
4.4.20.0070.0278.10
4.4.10.0070.0208.10
4.4.00.0030.0538.10
4.3.110.0030.0138.10
4.3.100.0000.0208.10
4.3.90.0070.0208.10
4.3.80.0030.0478.10
4.3.70.0000.0378.10
4.3.60.0030.0338.10
4.3.50.0070.0238.10
4.3.40.0070.0438.10
4.3.30.0030.0178.10
4.3.20.0030.0378.10
4.3.10.0000.0408.10
4.3.00.0030.0338.10

preferences:
53.48 ms | 401 KiB | 5 Q