3v4l.org

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

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)
8.3.60.0090.00918.18
8.3.50.0100.00921.27
8.3.40.0100.00718.84
8.3.30.0130.00020.23
8.3.20.0040.00420.17
8.3.10.0080.00022.13
8.3.00.0070.00022.42
8.2.180.0100.00716.38
8.2.170.0030.01022.96
8.2.160.0100.00322.11
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0080.00026.16
8.2.120.0040.00420.69
8.2.110.0030.00719.19
8.2.100.0080.00317.84
8.2.90.0000.00819.20
8.2.80.0000.00817.97
8.2.70.0080.00017.50
8.2.60.0090.00017.93
8.2.50.0030.00618.07
8.2.40.0050.00319.82
8.2.30.0050.00219.46
8.2.20.0000.00717.63
8.2.10.0030.00617.52
8.2.00.0050.00217.59
8.1.280.0140.00725.92
8.1.270.0000.00823.99
8.1.260.0080.00026.35
8.1.250.0060.00328.09
8.1.240.0060.00322.14
8.1.230.0080.00320.67
8.1.220.0040.00717.74
8.1.210.0060.00318.77
8.1.200.0070.00317.23
8.1.190.0040.00417.53
8.1.180.0080.00418.10
8.1.170.0030.00518.50
8.1.160.0080.00318.78
8.1.150.0080.00018.48
8.1.140.0040.00417.42
8.1.130.0030.00317.82
8.1.120.0040.00417.30
8.1.110.0060.00317.26
8.1.100.0000.00717.28
8.1.90.0040.00417.34
8.1.80.0050.00217.37
8.1.70.0030.00317.33
8.1.60.0040.00417.55
8.1.50.0040.00417.41
8.1.40.0040.00417.49
8.1.30.0080.00017.61
8.1.20.0040.00417.68
8.1.10.0030.00517.33
8.1.00.0060.00317.36
8.0.300.0050.00318.77
8.0.290.0030.00616.63
8.0.280.0070.00018.29
8.0.270.0030.00317.05
8.0.260.0070.00016.66
8.0.250.0040.00416.82
8.0.240.0040.00416.84
8.0.230.0040.00416.74
8.0.220.0000.00716.75
8.0.210.0000.00716.80
8.0.200.0030.00316.77
8.0.190.0050.00216.77
8.0.180.0040.00416.75
8.0.170.0080.00016.80
8.0.160.0040.00416.77
8.0.150.0080.00016.75
8.0.140.0000.00916.80
8.0.130.0030.00313.21
8.0.120.0000.00716.78
8.0.110.0040.00416.78
8.0.100.0050.00316.80
8.0.90.0080.00016.89
8.0.80.0030.01416.75
8.0.70.0000.00716.69
8.0.60.0000.00716.93
8.0.50.0050.00316.87
8.0.30.0140.00616.97
8.0.20.0130.00517.40
8.0.10.0030.00517.05
8.0.00.0120.00616.65
7.4.330.0030.00315.00
7.4.320.0050.00216.54
7.4.300.0000.00616.51
7.4.290.0030.00316.47
7.4.280.0030.00316.34
7.4.270.0040.00416.54
7.4.260.0000.00513.28
7.4.250.0030.00516.39
7.4.240.0000.00716.51
7.4.230.0000.00816.48
7.4.220.0120.01016.59
7.4.210.0090.00816.53
7.4.200.0000.00716.65
7.4.190.0070.00016.76
7.4.160.0060.00916.41
7.4.150.0100.00717.40
7.4.140.0120.00517.86
7.4.130.0110.00516.36
7.4.120.0100.00716.38
7.4.110.0120.00616.33
7.4.100.0040.01516.28
7.4.90.0070.01016.30
7.4.80.0140.00919.39
7.4.70.0130.00416.45
7.4.60.0130.00316.63
7.4.50.0030.00616.59
7.4.40.0110.00722.77
7.4.30.0030.01216.52
7.4.10.0040.01114.84
7.4.00.0010.01515.08
7.3.330.0000.00513.24
7.3.320.0060.00013.00
7.3.310.0070.00016.28
7.3.300.0000.00716.10
7.3.290.0030.01616.21
7.3.280.0080.01016.24
7.3.270.0090.00617.40
7.3.260.0090.01216.29
7.3.250.0080.00916.42
7.3.240.0120.00316.58
7.3.230.0080.00916.56
7.3.210.0100.00716.45
7.3.200.0120.00619.39
7.3.190.0220.00016.27
7.3.180.0120.00316.25
7.3.170.0090.00616.27
7.3.160.0070.01416.43
7.3.130.0060.01215.06
7.3.120.0070.01014.75
7.3.110.0040.01514.68
7.3.100.0070.01014.96
7.3.90.0120.00614.74
7.3.80.0080.00414.62
7.3.70.0030.01114.61
7.3.60.0040.00814.61
7.3.50.0030.01114.48
7.3.40.0090.00614.82
7.3.30.0000.01514.74
7.3.20.0060.01016.52
7.3.10.0060.00616.42
7.3.00.0030.00916.54
7.2.330.0110.00916.58
7.2.320.0080.00816.63
7.2.310.0090.00916.48
7.2.300.0090.00616.28
7.2.290.0090.00616.57
7.2.260.0090.00914.55
7.2.250.0070.01314.72
7.2.240.0070.01014.83
7.2.230.0000.01815.06
7.2.220.0060.00614.98
7.2.210.0030.01014.69
7.2.200.0030.01414.70
7.2.190.0060.00914.71
7.2.180.0070.00714.55
7.2.170.0060.00614.99
7.2.160.0000.01814.71
7.2.150.0070.00716.78
7.2.140.0100.00716.80
7.2.130.0060.01216.50
7.2.120.0090.00316.75
7.2.110.0040.01216.92
7.2.100.0000.01516.83
7.2.90.0070.00316.46
7.2.80.0060.00916.85
7.2.70.0030.01016.70
7.2.60.0020.01416.73
7.2.50.0060.00916.52
7.2.40.0070.00716.77
7.2.30.0000.01416.71
7.2.20.0120.00316.87
7.2.10.0000.01416.79
7.2.00.0020.01217.95
7.1.330.0060.00815.55
7.1.320.0150.00015.88
7.1.310.0090.00315.61
7.1.300.0040.00715.61
7.1.290.0110.00315.45
7.1.280.0090.00315.90
7.1.270.0030.01315.84
7.1.260.0080.00415.72
7.1.250.0030.00815.73
7.1.240.0090.00315.84
7.1.230.0000.01215.74
7.1.220.0030.01015.76
7.1.210.0070.00715.55
7.1.200.0080.00715.75
7.1.190.0000.00915.64
7.1.180.0080.00415.71
7.1.170.0030.00715.51
7.1.160.0040.01115.73
7.1.150.0000.01415.59
7.1.140.0000.01315.56
7.1.130.0050.00615.83
7.1.120.0030.00615.82
7.1.110.0060.00615.55
7.1.100.0030.00716.87
7.1.90.0060.00615.68
7.1.80.0100.00015.61
7.1.70.0050.00516.53
7.1.60.0050.01217.52
7.1.50.0160.00625.09
7.1.40.0060.01015.79
7.1.30.0100.00715.80
7.1.20.0100.00715.63
7.1.10.0070.01115.62
7.1.00.0050.03119.04
7.0.330.0100.00715.08
7.0.320.0030.00715.30
7.0.310.0080.00615.35
7.0.300.0130.00015.07
7.0.290.0000.01215.34
7.0.280.0080.00315.29
7.0.270.0030.01315.55
7.0.260.0120.00315.54
7.0.250.0100.00315.38
7.0.240.0130.00015.56
7.0.230.0040.00715.51
7.0.220.0070.00315.34
7.0.210.0070.00715.32
7.0.200.0200.00315.08
7.0.190.0060.00615.48
7.0.180.0100.00315.45
7.0.170.0040.01115.33
7.0.160.0140.00015.18
7.0.150.0070.00315.27
7.0.140.0030.03818.52
7.0.130.0100.00315.50
7.0.120.0070.00715.29
7.0.110.0030.01315.42
7.0.100.0100.00315.45
7.0.90.0000.01115.40
7.0.80.0100.00315.45
7.0.70.0050.04018.61
7.0.60.0050.03518.57
7.0.50.0080.02718.73
7.0.40.0020.04116.82
7.0.30.0030.03516.83
7.0.20.0030.04016.78
7.0.10.0050.02816.78
7.0.00.0030.04616.80
5.6.400.0000.01214.43
5.6.390.0070.00713.82
5.6.380.0040.01114.02
5.6.370.0080.00614.21
5.6.360.0030.00714.25
5.6.350.0090.00614.21
5.6.340.0060.00614.15
5.6.330.0030.00914.27
5.6.320.0000.01114.11
5.6.310.0100.00613.91
5.6.300.0080.00514.27
5.6.290.0030.01014.01
5.6.280.0050.05217.63
5.6.270.0070.00714.30
5.6.260.0070.00714.15
5.6.250.0040.00814.11
5.6.240.0070.00714.16
5.6.230.0000.01114.27
5.6.220.0070.04517.35
5.6.210.0080.04017.22
5.6.200.0080.04217.59
5.6.190.0080.03417.63
5.6.180.0050.02317.58
5.6.170.0130.02317.59
5.6.160.0080.04317.54
5.6.150.0050.04217.60
5.6.140.0130.04017.59
5.6.130.0070.04117.70
5.6.120.0060.04517.71
5.6.110.0030.05017.61
5.6.100.0070.02917.41
5.6.90.0060.03917.65
5.6.80.0100.02917.15
5.6.70.0040.02817.14
5.6.60.0050.03717.20
5.6.50.0050.04017.21
5.6.40.0020.04117.36
5.6.30.0030.04417.31
5.6.20.0050.04217.34
5.6.10.0090.04117.29
5.6.00.0060.04517.26
5.5.380.0030.01013.86
5.5.370.0000.01714.08
5.5.360.0020.04717.17
5.5.350.0020.04617.29
5.5.340.0060.04517.47
5.5.330.0050.03017.42
5.5.320.0030.02617.57
5.5.310.0030.04317.38
5.5.300.0030.04817.40
5.5.290.0050.04017.48
5.5.280.0030.04317.64
5.5.270.0050.04317.40
5.5.260.0020.04617.62
5.5.250.0050.04317.30
5.5.240.0050.03017.12
5.5.230.0030.02417.10
5.5.220.0030.04217.13
5.5.210.0050.02016.99
5.5.200.0000.04816.96
5.5.190.0020.04717.18
5.5.180.0020.03217.08
5.5.170.0090.00613.96
5.5.160.0120.03917.06
5.5.150.0030.02617.23
5.5.140.0030.03817.11
5.5.130.0070.04317.07
5.5.120.0070.04117.22
5.5.110.0090.03917.07
5.5.100.0010.03117.18
5.5.90.0030.03917.06
5.5.80.0070.04217.07
5.5.70.0060.03817.06
5.5.60.0020.04617.06
5.5.50.0080.03917.02
5.5.40.0080.02817.11
5.5.30.0110.03716.96
5.5.20.0000.04617.01
5.5.10.0050.04216.93
5.5.00.0030.03216.94
5.4.450.0090.04015.26
5.4.440.0050.04215.25
5.4.430.0050.03715.24
5.4.420.0000.04415.21
5.4.410.0050.02215.13
5.4.400.0060.01815.03
5.4.390.0080.03515.13
5.4.380.0020.02214.99
5.4.370.0040.01615.02
5.4.360.0030.04015.04
5.4.350.0020.02715.09
5.4.340.0030.04014.93
5.4.330.0060.00310.99
5.4.320.0050.02715.12
5.4.310.0050.02315.12
5.4.300.0000.03715.01
5.4.290.0020.03915.08
5.4.280.0050.02714.96
5.4.270.0030.04014.99
5.4.260.0010.04615.03
5.4.250.0050.02915.01
5.4.240.0050.04215.02
5.4.230.0050.04215.05
5.4.220.0050.02615.01
5.4.210.0050.02215.10
5.4.200.0000.03915.08
5.4.190.0050.03014.92
5.4.180.0030.04215.02
5.4.170.0010.04115.09
5.4.160.0050.04015.15
5.4.150.0080.02315.09
5.4.140.0020.02013.70
5.4.130.0050.01713.66
5.4.120.0020.03013.70
5.4.110.0020.04113.75
5.4.100.0040.03813.76
5.4.90.0050.03613.69
5.4.80.0020.04313.72
5.4.70.0020.03713.71
5.4.60.0020.03013.65
5.4.50.0020.04313.67
5.4.40.0020.03813.65
5.4.30.0050.03813.68
5.4.20.0030.03813.73
5.4.10.0020.04013.73
5.4.00.0050.04013.42
5.3.290.0030.04212.82
5.3.280.0040.02812.81
5.3.270.0030.04212.83
5.3.260.0020.03812.84
5.3.250.0030.04012.81
5.3.240.0010.02012.85
5.3.230.0030.03912.85
5.3.220.0030.04212.79
5.3.210.0050.03812.80
5.3.200.0000.04212.78
5.3.190.0020.04012.79
5.3.180.0050.03912.82
5.3.170.0050.03612.79
5.3.160.0060.03812.83
5.3.150.0020.04012.79
5.3.140.0000.04112.83
5.3.130.0030.03012.81
5.3.120.0020.04012.83
5.3.110.0050.03512.74
5.3.100.0000.04612.48
5.3.90.0050.03812.57
5.3.80.0030.02412.46
5.3.70.0070.03712.53
5.3.60.0000.04112.53
5.3.50.0050.03712.47
5.3.40.0070.03512.51
5.3.30.0020.03712.50
5.3.20.0020.04012.33
5.3.10.0030.02312.31
5.3.00.0050.02512.27
5.2.170.0000.04012.22
5.2.160.0000.03712.22
5.2.150.0070.06012.22
5.2.140.0000.05312.22
5.2.130.0030.02012.22
5.2.120.0000.06312.22
5.2.110.0000.06312.22
5.2.100.0100.05712.22
5.2.90.0030.06012.22
5.2.80.0070.04312.22
5.2.70.0000.06312.22
5.2.60.0000.06712.22
5.2.50.0070.06012.22
5.2.40.0000.06012.22
5.2.30.0000.06012.22
5.2.20.0030.04712.22
5.2.10.0030.04012.22
5.2.00.0200.04312.22
5.1.60.0030.05312.22
5.1.50.0070.05012.22
5.1.40.0000.03712.22
5.1.30.0000.06012.22
5.1.20.0070.05312.22
5.1.10.0030.04312.22
5.1.00.0070.04712.22
5.0.50.0000.04012.22
5.0.40.0000.04712.22
5.0.30.0030.06312.22
5.0.20.0030.03312.22
5.0.10.0000.04012.22
5.0.00.0000.07012.22
4.4.90.0030.02712.22
4.4.80.0000.02712.22
4.4.70.0070.02012.22
4.4.60.0000.04012.22
4.4.50.0030.03312.22
4.4.40.0070.05012.22
4.4.30.0000.03012.22
4.4.20.0000.03012.22
4.4.10.0030.03712.22
4.4.00.0030.04712.22
4.3.110.0000.03012.22
4.3.100.0070.03012.22
4.3.90.0000.03712.22
4.3.80.0000.05712.22
4.3.70.0000.03312.22
4.3.60.0000.03012.22
4.3.50.0030.02312.22
4.3.40.0000.05312.22
4.3.30.0030.03012.22
4.3.20.0000.04012.22
4.3.10.0070.03312.22
4.3.00.0000.03712.22

preferences:
45.42 ms | 401 KiB | 5 Q