3v4l.org

run code in 300+ PHP versions simultaneously
<?php // inspired by discussion at: http://stackoverflow.com/questions/11158772/assigning-null-to-a-variable-in-php-what-does-that-do $a = 1; $a = null; echo isset($a) ? 'true' : 'false', "\n"; // false var_dump($a); // 'NULL' -- but no error notice - bug ? type changed to NULL unset($a); // now variable undefined echo isset($a) ? 'true' : 'false', "\n"; // false var_dump($a); // error notice and value 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)
8.3.60.0100.01016.62
8.3.50.0120.00321.83
8.3.40.0070.00718.50
8.3.30.0030.01419.27
8.3.20.0070.00020.29
8.3.10.0080.00023.36
8.3.00.0040.00420.69
8.2.180.0140.00716.63
8.2.170.0000.01422.96
8.2.160.0100.00720.45
8.2.150.0060.00324.18
8.2.140.0080.00024.66
8.2.130.0140.00026.16
8.2.120.0070.00022.08
8.2.110.0090.00019.32
8.2.100.0040.00818.22
8.2.90.0040.00419.21
8.2.80.0080.00017.97
8.2.70.0000.00817.63
8.2.60.0000.01317.80
8.2.50.0050.00318.07
8.2.40.0090.00018.28
8.2.30.0000.00718.11
8.2.20.0090.00017.72
8.2.10.0080.00017.68
8.2.00.0050.00317.68
8.1.280.0190.00325.92
8.1.270.0080.00023.96
8.1.260.0050.00226.35
8.1.250.0030.00628.09
8.1.240.0030.00622.55
8.1.230.0040.00820.78
8.1.220.0000.00818.69
8.1.210.0070.00319.04
8.1.200.0030.00617.23
8.1.190.0080.00017.28
8.1.180.0030.00618.10
8.1.170.0040.00418.51
8.1.160.0000.00722.00
8.1.150.0070.00018.53
8.1.140.0000.00717.47
8.1.130.0000.00717.87
8.1.120.0070.00017.34
8.1.110.0000.00717.29
8.1.100.0040.00417.30
8.1.90.0000.00717.39
8.1.80.0030.00317.38
8.1.70.0030.00317.35
8.1.60.0080.00017.53
8.1.50.0000.00817.42
8.1.40.0040.00417.35
8.1.30.0030.00517.48
8.1.20.0080.00017.43
8.1.10.0070.00017.50
8.1.00.0000.00817.34
8.0.300.0080.00020.03
8.0.290.0040.00417.28
8.0.280.0030.00318.45
8.0.270.0030.00317.36
8.0.260.0030.00316.87
8.0.250.0030.00317.02
8.0.240.0070.00016.91
8.0.230.0080.00316.91
8.0.220.0000.00716.76
8.0.210.0050.00316.82
8.0.200.0000.00616.98
8.0.190.0070.00016.99
8.0.180.0050.00316.91
8.0.170.0000.00816.78
8.0.160.0070.00016.98
8.0.150.0070.00016.71
8.0.140.0050.00316.84
8.0.130.0060.00013.40
8.0.120.0080.00016.74
8.0.110.0000.00716.82
8.0.100.0040.00416.77
8.0.90.0000.00716.96
8.0.80.0100.01316.93
8.0.70.0040.00416.83
8.0.60.0070.00016.74
8.0.50.0000.00716.71
8.0.30.0140.00917.19
8.0.20.0120.00817.40
8.0.10.0040.00416.81
8.0.00.0080.01016.73
7.4.330.0050.00015.00
7.4.320.0030.00316.30
7.4.300.0000.00616.55
7.4.290.0030.00316.39
7.4.280.0000.00716.50
7.4.270.0030.00316.55
7.4.260.0000.00616.51
7.4.250.0040.00416.54
7.4.240.0030.00416.54
7.4.230.0030.00316.52
7.4.220.0160.00316.49
7.4.210.0100.00716.48
7.4.200.0000.00716.18
7.4.190.0030.00316.60
7.4.160.0130.00316.52
7.4.150.0180.00317.40
7.4.140.0110.00717.86
7.4.130.0090.00816.37
7.4.120.0150.00716.62
7.4.110.0100.00716.50
7.4.100.0100.01316.61
7.4.90.0170.00416.55
7.4.80.0120.00919.39
7.4.70.0090.00616.48
7.4.60.0030.01416.41
7.4.50.0000.00916.18
7.4.40.0030.00822.77
7.4.30.0060.00916.49
7.4.10.0030.01014.92
7.4.00.0100.00614.85
7.3.330.0020.00212.93
7.3.320.0000.00713.04
7.3.310.0000.00816.26
7.3.300.0050.00216.25
7.3.290.0070.01516.20
7.3.280.0050.01216.22
7.3.270.0060.01117.40
7.3.260.0110.00716.34
7.3.250.0050.01116.40
7.3.240.0070.01016.43
7.3.230.0110.00616.39
7.3.210.0080.00816.29
7.3.200.0090.00916.24
7.3.190.0040.01416.20
7.3.180.0100.00616.46
7.3.170.0150.00616.38
7.3.160.0100.00616.27
7.3.130.0070.01314.86
7.3.120.0060.00914.78
7.3.110.0040.01414.81
7.3.100.0030.01214.88
7.3.90.0120.00614.53
7.3.80.0070.00414.71
7.3.70.0060.00614.58
7.3.60.0040.01114.80
7.3.50.0030.00514.88
7.3.40.0090.00614.75
7.3.30.0000.01014.45
7.3.20.0040.01116.62
7.3.10.0110.00016.73
7.3.00.0040.00716.59
7.2.330.0130.00316.62
7.2.320.0070.01116.39
7.2.310.0090.01216.32
7.2.300.0070.01116.52
7.2.290.0030.01516.19
7.2.260.0080.00614.83
7.2.250.0070.00715.13
7.2.240.0130.00314.50
7.2.230.0030.01614.46
7.2.220.0040.01414.81
7.2.210.0030.00614.80
7.2.200.0060.00614.58
7.2.190.0060.00914.73
7.2.180.0000.01214.84
7.2.170.0110.00415.04
7.2.160.0030.00714.89
7.2.150.0130.00716.74
7.2.140.0060.01216.71
7.2.130.0030.01016.81
7.2.120.0060.00916.86
7.2.110.0060.01016.52
7.2.100.0080.00816.79
7.2.90.0110.00416.73
7.2.80.0030.01316.34
7.2.70.0040.01116.63
7.2.60.0060.00816.84
7.2.50.0070.00716.97
7.2.40.0130.00316.83
7.2.30.0070.00716.47
7.2.20.0070.00716.66
7.2.10.0060.00616.73
7.2.00.0060.00617.94
7.1.330.0110.00415.72
7.1.320.0060.00915.68
7.1.310.0000.01115.81
7.1.300.0110.00315.78
7.1.290.0060.00615.69
7.1.280.0050.00315.80
7.1.270.0030.01215.63
7.1.260.0040.01415.55
7.1.250.0030.01015.70
7.1.240.0060.00915.53
7.1.230.0070.00715.54
7.1.220.0030.00615.45
7.1.210.0000.01515.83
7.1.200.0140.00315.31
7.1.190.0030.01215.71
7.1.180.0060.01215.89
7.1.170.0080.00715.67
7.1.160.0100.00015.43
7.1.150.0040.00415.87
7.1.140.0000.01315.85
7.1.130.0030.01015.54
7.1.120.0040.00715.56
7.1.110.0050.00515.83
7.1.100.0060.00716.80
7.1.90.0040.01115.96
7.1.80.0030.01215.81
7.1.70.0050.00416.18
7.1.60.0080.01117.57
7.1.50.0100.01016.40
7.1.40.0060.01215.68
7.1.30.0070.00715.68
7.1.20.0100.00715.79
7.1.10.0080.00415.56
7.1.00.0030.04318.89
7.0.330.0070.00715.39
7.0.320.0000.00815.36
7.0.310.0000.01015.33
7.0.300.0070.00715.34
7.0.290.0040.00715.39
7.0.280.0000.01215.07
7.0.270.0030.00615.36
7.0.260.0040.00715.34
7.0.250.0030.00715.46
7.0.240.0040.00815.05
7.0.230.0040.00815.30
7.0.220.0060.00315.48
7.0.210.0100.00315.07
7.0.200.0020.00816.15
7.0.190.0100.00715.34
7.0.180.0030.01115.45
7.0.170.0040.01115.07
7.0.160.0070.01115.31
7.0.150.0000.01415.42
7.0.140.0000.04518.52
7.0.130.0070.01015.43
7.0.120.0030.01015.48
7.0.110.0060.00615.48
7.0.100.0040.01115.36
7.0.90.0130.00015.58
7.0.80.0120.00015.53
7.0.70.0030.00715.45
7.0.60.0050.04317.64
7.0.50.0050.03716.55
7.0.40.0050.03816.87
7.0.30.0180.04216.62
7.0.20.0100.04316.83
7.0.10.0160.04216.79
7.0.00.0050.04816.75
5.6.400.0090.00913.98
5.6.390.0060.00914.25
5.6.380.0040.01114.16
5.6.370.0000.01314.16
5.6.360.0000.01414.39
5.6.350.0030.00914.58
5.6.340.0060.00614.28
5.6.330.0060.00614.12
5.6.320.0070.00714.04
5.6.310.0000.01214.32
5.6.300.0030.00914.18
5.6.290.0030.00914.45
5.6.280.0050.04217.55
5.6.270.0040.00413.90
5.6.260.0070.00714.15
5.6.250.0000.00814.18
5.6.240.0120.00314.09
5.6.230.0040.01214.53
5.6.220.0060.00614.46
5.6.210.0020.03017.38
5.6.200.0050.04616.21
5.6.190.0120.04217.58
5.6.180.0260.02317.22
5.6.170.0150.02717.28
5.6.160.0050.02517.36
5.6.150.0030.02816.39
5.6.140.0080.04516.16
5.6.130.0080.03216.24
5.6.120.0070.03017.54
5.6.110.0060.03817.80
5.6.100.0040.02217.55
5.6.90.0050.04717.56
5.6.80.0100.04117.29
5.6.70.0180.04217.35
5.6.60.0070.00713.95
5.6.50.0030.00914.25
5.6.40.0030.00714.28
5.6.30.0080.00414.17
5.6.20.0060.00914.12
5.6.10.0000.00913.98
5.6.00.0000.01314.33
5.5.380.0070.00714.14
5.5.370.0080.00414.13
5.5.360.0030.00514.15
5.5.350.0030.03117.29
5.5.340.0060.04516.09
5.5.330.0070.03217.25
5.5.320.0050.04617.12
5.5.310.0170.03917.10
5.5.300.0090.03815.94
5.5.290.0060.02516.08
5.5.280.0100.02317.43
5.5.270.0120.04017.32
5.5.260.0090.03517.45
5.5.250.0090.03317.41
5.5.240.0110.04116.94
5.5.230.0080.00413.92
5.5.220.0040.00814.11
5.5.210.0100.00314.00
5.5.200.0000.01314.11
5.5.190.0000.01513.75
5.5.180.0000.01714.20
5.5.170.0060.00314.00
5.5.160.0080.00614.27
5.5.150.0070.00313.92
5.5.140.0070.00314.15
5.5.130.0040.01213.97
5.5.120.0040.00713.99
5.5.110.0040.00714.16
5.5.100.0070.00714.00
5.5.90.0040.01114.04
5.5.80.0060.01213.88
5.5.70.0000.01614.21
5.5.60.0090.00614.10
5.5.50.0030.01514.01
5.5.40.0060.00914.11
5.5.30.0040.01514.35
5.5.20.0070.00713.65
5.5.10.0000.01213.76
5.5.00.0100.01013.80
5.4.450.0050.01815.13
5.4.440.0510.03514.89
5.4.430.0170.02815.31
5.4.420.0300.03515.24
5.4.410.0500.03315.12
5.4.400.0380.03014.95
5.4.390.0070.03214.92
5.4.380.0180.02414.54
5.4.370.0100.03014.63
5.4.360.0120.02714.70
5.4.350.0180.03014.55
5.4.340.0100.03114.58
5.4.330.0050.00510.82
5.4.320.0050.02011.51
5.4.310.0060.02911.55
5.4.300.0040.02411.50
5.4.290.0040.02311.59
5.4.280.0040.02311.58
5.4.270.0070.02311.35
5.4.260.0050.02511.56
5.4.250.0090.02211.36
5.4.240.0080.01911.55
5.4.230.0050.02311.40
5.4.220.0030.02311.44
5.4.210.0050.02411.37
5.4.200.0050.02511.51
5.4.190.0080.02911.47
5.4.180.0080.02811.41
5.4.170.0100.02411.51
5.4.160.0050.02411.56
5.4.150.0040.02511.55
5.4.140.0040.02511.20
5.4.130.0110.01911.31
5.4.120.0070.01911.20
5.4.110.0050.02011.24
5.4.100.0050.02111.29
5.4.90.0020.02311.29
5.4.80.0050.02511.41
5.4.70.0060.02011.31
5.4.60.0020.02211.38
5.4.50.0100.02111.33
5.4.40.0050.02211.23
5.4.30.0050.02311.35
5.4.20.0080.02011.30
5.4.10.0070.02011.19
5.4.00.0080.02111.03
5.3.290.0060.02311.76
5.3.280.0050.02811.62
5.3.270.0060.02311.64
5.3.260.0070.02211.58
5.3.250.0050.02211.63
5.3.240.0060.02011.51
5.3.230.0060.02011.51
5.3.220.0100.02411.48
5.3.210.0050.02511.51
5.3.200.0060.02111.53
5.3.190.0060.02111.54
5.3.180.0030.02511.57
5.3.170.0090.01911.62
5.3.160.0050.02411.58
5.3.150.0070.02011.58
5.3.140.0070.01811.48
5.3.130.0070.02011.53
5.3.120.0050.02311.54
5.3.110.0070.01911.55
5.3.100.0020.02611.18
5.3.90.0040.02311.28
5.3.80.0040.02211.18
5.3.70.0030.02011.18
5.3.60.0020.02411.24
5.3.50.0050.02011.08
5.3.40.0050.02011.16
5.3.30.0040.02211.17
5.3.20.0060.02210.92
5.3.10.0080.01810.84
5.3.00.0070.02310.86
5.2.170.0080.0309.15
5.2.160.0060.0449.14
5.2.150.0090.0439.14
5.2.140.0080.0449.13
5.2.130.0060.0409.10
5.2.120.0060.0399.09
5.2.110.0050.0399.10
5.2.100.0150.0479.10
5.2.90.0050.0399.10
5.2.80.0070.0299.09
5.2.70.0050.0329.09
5.2.60.0060.0339.05
5.2.50.0040.0339.02
5.2.40.0060.0308.99
5.2.30.0030.0348.96
5.2.20.0040.0318.96
5.2.10.0020.0328.88
5.2.00.0030.0318.75
5.1.60.0070.0318.02
5.1.50.0090.0218.03
5.1.40.0090.0318.02
5.1.30.0050.0308.36
5.1.20.0040.0288.39
5.1.10.0040.0268.11
5.1.00.0060.0248.11
5.0.50.0050.0276.59
5.0.40.0030.0266.45
5.0.30.0050.0356.26
5.0.20.0080.0176.23
5.0.10.0050.0266.21
5.0.00.0050.0406.20
4.4.90.0080.0214.77
4.4.80.0130.0214.75
4.4.70.0020.0194.75
4.4.60.0010.0184.75
4.4.50.0050.0164.77
4.4.40.0030.0284.71
4.4.30.0030.0184.76
4.4.20.0040.0164.84
4.4.10.0040.0164.85
4.4.00.0030.0294.76
4.3.110.0030.0174.67
4.3.100.0030.0184.66
4.3.90.0070.0174.64
4.3.80.0040.0314.58
4.3.70.0060.0194.63
4.3.60.0040.0144.63
4.3.50.0040.0154.63
4.3.40.0000.0284.54
4.3.30.0020.0163.27
4.3.20.0030.0183.25
4.3.10.0030.0143.22
4.3.00.0000.01313.14

preferences:
51.37 ms | 401 KiB | 5 Q