3v4l.org

run code in 300+ PHP versions simultaneously
<?php $mystring = null; if (empty($mystring)) { echo "empty\n"; } if ($mystring == null) { echo "null\n"; // and warning } if (!isset($mystring)) { echo "unset\n"; }

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)
8.3.40.0150.00018.79
8.3.30.0060.00918.96
8.3.20.0080.00020.23
8.3.10.0070.00023.36
8.3.00.0060.00319.26
8.2.170.0000.01522.96
8.2.160.0030.01020.46
8.2.150.0040.00424.18
8.2.140.0080.00024.66
8.2.130.0070.00026.16
8.2.120.0070.00022.26
8.2.110.0030.00622.13
8.2.100.0040.00819.64
8.2.90.0040.00419.20
8.2.80.0040.00417.97
8.2.70.0060.00317.63
8.2.60.0040.00418.04
8.2.50.0040.00418.07
8.2.40.0000.00820.01
8.2.30.0030.00518.10
8.2.20.0080.00017.58
8.2.10.0050.00217.95
8.2.00.0030.00617.71
8.1.270.0140.00323.96
8.1.260.0040.00426.35
8.1.250.0070.00028.09
8.1.240.0130.01021.97
8.1.230.0050.00519.03
8.1.220.0040.00417.74
8.1.210.0040.00418.77
8.1.200.0000.00917.25
8.1.190.0040.00417.23
8.1.180.0040.00418.10
8.1.170.0000.00818.34
8.1.160.0000.00721.85
8.1.150.0110.00018.52
8.1.140.0040.00417.31
8.1.130.0000.00717.78
8.1.120.0040.00417.39
8.1.110.0040.00417.48
8.1.100.0040.00417.39
8.1.90.0070.00017.34
8.1.80.0000.00717.34
8.1.70.0000.00717.41
8.1.60.0030.00917.57
8.1.50.0030.00517.42
8.1.40.0050.00217.50
8.1.30.0000.00817.50
8.1.20.0080.00017.62
8.1.10.0030.00517.36
8.1.00.0030.00617.32
8.0.300.0040.00418.77
8.0.290.0070.00017.16
8.0.280.0000.00718.36
8.0.270.0070.00017.30
8.0.260.0030.00317.30
8.0.250.0030.00316.87
8.0.240.0070.00016.95
8.0.230.0030.00317.00
8.0.220.0020.00516.77
8.0.210.0030.00516.91
8.0.200.0060.00016.90
8.0.190.0040.00416.96
8.0.180.0000.00816.86
8.0.170.0000.00816.95
8.0.160.0030.00316.95
8.0.150.0070.00016.85
8.0.140.0000.00716.85
8.0.130.0060.00013.27
8.0.120.0040.00416.80
8.0.110.0000.00716.88
8.0.100.0000.00716.88
8.0.90.0030.00516.83
8.0.80.0070.00816.87
8.0.70.0000.00716.85
8.0.60.0080.00016.69
8.0.50.0070.00016.86
8.0.30.0120.00717.11
8.0.20.0090.01217.40
8.0.10.0000.00717.08
8.0.00.0130.00617.02
7.4.330.0030.00315.00
7.4.320.0030.00316.59
7.4.300.0000.00716.53
7.4.290.0030.00316.48
7.4.280.0040.00416.58
7.4.270.0040.00416.54
7.4.260.0000.00716.45
7.4.250.0000.00716.57
7.4.240.0030.00316.58
7.4.230.0070.00016.54
7.4.220.0080.00816.59
7.4.210.0090.00716.59
7.4.200.0040.00416.34
7.4.190.0070.00016.75
7.4.160.0120.00316.30
7.4.150.0070.01117.40
7.4.140.0100.00617.86
7.4.130.0120.00816.49
7.4.120.0070.00916.50
7.4.110.0060.01716.53
7.4.100.0070.01016.56
7.4.90.0140.00316.61
7.4.80.0090.00919.39
7.4.70.0110.00716.47
7.4.60.0050.01116.32
7.4.50.0000.00816.61
7.4.40.0100.00716.70
7.4.30.0130.01016.50
7.4.00.0040.00714.83
7.3.330.0060.00013.11
7.3.320.0030.00313.20
7.3.310.0040.00416.00
7.3.300.0030.00316.05
7.3.290.0150.00016.25
7.3.280.0120.00716.20
7.3.270.0110.00617.40
7.3.260.0030.01316.18
7.3.250.0090.01116.35
7.3.240.0130.01016.45
7.3.230.0140.00716.39
7.3.210.0100.00716.20
7.3.200.0090.01119.39
7.3.190.0100.01016.50
7.3.180.0100.00716.16
7.3.170.0060.00916.46
7.3.160.0070.01016.28
7.3.120.0030.01014.89
7.2.330.0100.01416.45
7.2.320.0060.01716.57
7.2.310.0130.00416.57
7.2.300.0030.01316.59
7.2.290.0060.01816.37
7.2.00.0090.00619.21
7.1.100.0000.01117.91
7.1.70.0130.00016.91
7.1.60.0070.01019.46
7.1.50.0130.01016.69
7.1.00.0070.07322.57
7.0.200.0000.00716.84
7.0.140.0030.07322.21
7.0.60.0030.06019.99
7.0.50.0030.05017.87
7.0.40.0030.04320.05
7.0.30.0230.03720.13
7.0.20.0270.08020.21
7.0.10.0000.04720.30
7.0.00.0130.07720.18
5.6.280.0070.06720.77
5.6.210.0130.05720.75
5.6.200.0100.05718.18
5.6.190.0070.05320.67
5.6.180.0230.05320.60
5.6.170.0300.07320.48
5.6.160.0130.05320.49
5.6.150.0070.04018.11
5.6.140.0030.05018.11
5.6.130.0000.04318.21
5.6.120.0170.06721.14
5.6.110.0130.07721.04
5.6.100.0030.07021.10
5.6.90.0130.07721.09
5.6.80.0100.07720.50
5.5.350.0230.08020.31
5.5.340.0070.08017.89
5.5.330.0070.04720.56
5.5.320.0070.06320.17
5.5.310.0170.08720.20
5.5.300.0070.06018.01
5.5.290.0070.06717.92
5.5.280.0000.07320.93
5.5.270.0130.06720.75
5.5.260.0030.04320.75
5.5.250.0130.07320.54
5.5.240.0000.08320.25
5.4.450.0670.05019.64
5.4.440.0570.06019.13
5.4.430.0700.06719.47
5.4.420.0400.05319.48
5.4.410.0730.07019.28
5.4.400.0870.07018.92
5.4.390.0730.06319.20
5.4.380.0130.05018.68
5.4.370.0100.05718.49
5.4.360.0170.05018.72
5.4.350.0130.05318.74
5.4.340.0230.04318.77
5.4.320.0060.04412.45
5.4.310.0110.03912.45
5.4.300.0060.04012.45
5.4.290.0080.03912.45
5.4.280.0070.04212.34
5.4.270.0090.04612.34
5.4.260.0100.05212.34
5.4.250.0070.05212.34
5.4.240.0110.04712.34
5.4.230.0120.05212.34
5.4.220.0070.05612.34
5.4.210.0070.05412.34
5.4.200.0110.05312.34
5.4.190.0100.03412.33
5.4.180.0110.03512.34
5.4.170.0110.04512.34
5.4.160.0080.05212.34
5.4.150.0090.05012.34
5.4.140.0050.04812.02
5.4.130.0110.03812.01
5.4.120.0170.04211.97
5.4.110.0060.03711.96
5.4.100.0020.04011.96
5.4.90.0060.03911.96
5.4.80.0070.03711.96
5.4.70.0070.03711.96
5.4.60.0090.03411.96
5.4.50.0070.03611.96
5.4.40.0070.03711.95
5.4.30.0080.03711.95
5.4.20.0050.03811.95
5.4.10.0060.03611.95
5.4.00.0080.03711.44
5.3.290.0090.05112.80
5.3.280.0040.05412.71
5.3.270.0100.04712.73
5.3.260.0090.05412.72
5.3.250.0080.05512.72
5.3.240.0070.03612.72
5.3.230.0080.03712.70
5.3.220.0040.04012.68
5.3.210.0080.03812.68
5.3.200.0050.03912.68
5.3.190.0080.03612.68
5.3.180.0070.03512.67
5.3.170.0080.03412.67
5.3.160.0050.03812.67
5.3.150.0050.03912.67
5.3.140.0050.03712.66
5.3.130.0070.03712.66
5.3.120.0090.03612.66
5.3.110.0050.04012.66
5.3.100.0090.03712.12
5.3.90.0050.04112.09
5.3.80.0090.03412.07
5.3.70.0070.03512.07
5.3.60.0050.03812.06
5.3.50.0060.03612.00
5.3.40.0060.03712.00
5.3.30.0060.03611.94
5.3.20.0050.03611.72
5.3.10.0040.03711.69
5.3.00.0060.03611.67
5.2.170.0060.0299.18
5.2.160.0010.0339.18
5.2.150.0050.0319.18
5.2.140.0080.0289.17
5.2.130.0030.0309.13
5.2.120.0050.0289.14
5.2.110.0050.0299.14
5.2.100.0050.0289.14
5.2.90.0030.0309.13
5.2.80.0070.0309.13
5.2.70.0080.0359.13
5.2.60.0090.0389.08
5.2.50.0090.0409.06
5.2.40.0070.0369.03
5.2.30.0100.0359.00
5.2.20.0090.0278.99
5.2.10.0060.0268.91
5.2.00.0040.0298.77
5.1.60.0040.0248.06
5.1.50.0040.0258.06
5.1.40.0040.0258.04
5.1.30.0050.0258.39
5.1.20.0050.0268.41
5.1.10.0030.0278.13
5.1.00.0050.0248.14
5.0.50.0020.0226.61
5.0.40.0040.0196.47
5.0.30.0030.0366.29
5.0.20.0040.0196.25
5.0.10.0050.0196.23
5.0.00.0030.0326.22
4.4.90.0030.0164.78
4.4.80.0030.0164.75
4.4.70.0050.0204.75
4.4.60.0070.0174.75
4.4.50.0020.0164.77
4.4.40.0020.0274.71
4.4.30.0050.0134.75
4.4.20.0050.0134.84
4.4.10.0020.0174.85
4.4.00.0030.0254.76
4.3.110.0030.0154.66
4.3.100.0040.0134.66
4.3.90.0050.0124.63
4.3.80.0020.0254.58
4.3.70.0020.0154.63
4.3.60.0020.0164.63
4.3.50.0040.0144.63
4.3.40.0010.0264.54
4.3.30.0020.0163.29
4.3.20.0020.0163.26
4.3.10.0010.0163.22
4.3.00.0100.0279.43

preferences:
39.94 ms | 400 KiB | 5 Q