3v4l.org

run code in 300+ PHP versions simultaneously
<?php ob_start(); echo '#+++++++++++++++++++++++++++++++++++#' . PHP_EOL; echo '# Checking if a constant is defined #' . PHP_EOL; echo '# always retuns (bool)false in PHP. #' . PHP_EOL; echo '# Even if it has been defined! #' . PHP_EOL; echo '#+++++++++++++++++++++++++++++++++++#' . PHP_EOL; error_reporting(E_ALL); echo 'Testing on PHP version ' . PHP_VERSION . PHP_EOL . PHP_EOL; ob_flush(); flush(); sleep(1); echo 'Checking if `__DIR__` is defined...' . PHP_EOL; if (!defined('__DIR__')) { ob_flush(); flush(); sleep(2); echo 'Nope, `defined()` returned `(bool)false`.' . PHP_EOL; echo 'So, seems like the magic constant `__DIR__` is not defined.' . PHP_EOL . PHP_EOL; ob_flush(); flush(); sleep(2); echo 'No prob. Executing `define(\'__DIR__\', \'/foo/bar\')`...' . PHP_EOL; define('__DIR__', '/foo/bar'); ob_flush(); flush(); sleep(1); echo 'Done, defined `__DIR__` as "/foo/bar".' . PHP_EOL . PHP_EOL; ob_flush(); flush(); sleep(1); echo 'Double-checking `__DIR__` is defined now...' . PHP_EOL; ob_flush(); flush(); sleep(2); if (!defined('__DIR__')) { echo 'WTF, `defined(\'__DIR__\')` again returned `(bool)false`?!' . PHP_EOL; } else{ echo 'Strike, this time `defined(\'__DIR__\')` returned `(bool)true`.' . PHP_EOL; echo 'So, seems like `__DIR__` was successfully defined. :)' . PHP_EOL . PHP_EOL; } } else{ echo 'Yep, `defined(\'__DIR__\')` returned `(bool)true`.' . PHP_EOL; echo 'The magic constant `__DIR__` seems to be defined.' . PHP_EOL . PHP_EOL; } ob_flush(); flush(); sleep(2); echo 'Finally, here is the result of `var_dump(__DIR__)`:' . PHP_EOL; var_dump(__DIR__); ob_flush(); flush(); sleep(1); if ("/foo/bar" != __DIR__) { echo 'But, wait..' . PHP_EOL; echo 'I defined `__DIR__` as "/foo/bar" - not as "' . __DIR__ .'"?! What happend?' . PHP_EOL . PHP_EOL; ob_flush(); flush(); sleep(1); echo 'In fact, `__DIR__` was already defined when first checked.' . PHP_EOL; echo 'But 1) `defined(\'__MAGIC_CONSTANT__\')` ALWAYS returns `(bool)false`' . PHP_EOL; echo 'and 2) defined constants can not be overwritten.' . PHP_EOL; }

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)
8.3.70.0110.00416.58
8.3.60.0120.00918.31
8.3.50.0070.00721.83
8.3.40.0110.00618.68
8.3.30.0050.00918.71
8.3.20.0100.00018.78
8.3.10.0090.00020.47
8.3.00.0000.00821.77
8.2.180.0130.00716.38
8.2.170.0070.00722.96
8.2.160.0110.00320.39
8.2.150.0030.00624.18
8.2.140.0080.00024.66
8.2.130.0040.00426.16
8.2.120.0040.00419.48
8.2.110.0100.00020.94
8.2.100.0060.00617.91
8.2.90.0080.00018.97
8.2.80.0030.00617.97
8.2.70.0100.00317.38
8.2.60.0000.00817.80
8.2.50.0030.00518.10
8.2.40.0070.00318.06
8.2.30.0040.00419.89
8.2.20.0000.00717.77
8.2.10.0040.00417.78
8.2.00.0030.00517.61
8.1.280.0090.00925.92
8.1.270.0050.01023.99
8.1.260.0040.00426.35
8.1.250.0080.00028.09
8.1.240.0070.00419.53
8.1.230.0110.00017.64
8.1.220.0080.00017.74
8.1.210.0040.00418.77
8.1.200.0060.00317.13
8.1.190.0080.00017.23
8.1.180.0040.00418.10
8.1.170.0040.00418.72
8.1.160.0040.00418.89
8.1.150.0070.00018.63
8.1.140.0040.00417.48
8.1.130.0070.00017.86
8.1.120.0030.00517.51
8.1.110.0000.00817.39
8.1.100.0040.00417.48
8.1.90.0040.00417.51
8.1.80.0000.00717.46
8.1.70.0000.00717.52
8.1.60.0100.00017.60
8.1.50.0000.00817.42
8.1.40.0000.00917.62
8.1.30.0000.00817.64
8.1.20.0030.00617.63
8.1.10.0050.00217.51
8.1.00.0010.00617.41
8.0.300.0060.00318.77
8.0.290.0030.00516.58
8.0.280.0050.00318.23
8.0.270.0030.00317.20
8.0.260.0040.00416.73
8.0.250.0040.00416.77
8.0.240.0040.00416.83
8.0.230.0000.00716.91
8.0.220.0000.00716.83
8.0.210.0030.00316.71
8.0.200.0000.00716.79
8.0.190.0020.00516.81
8.0.180.0080.00016.79
8.0.170.0060.00316.78
8.0.160.0050.00216.77
8.0.150.0000.00816.72
8.0.140.0000.00716.77
8.0.130.0000.00513.30
8.0.120.0030.00516.75
8.0.110.0030.00516.78
8.0.100.0020.00516.80
8.0.90.0050.00316.63
8.0.80.0100.00716.71
8.0.70.0000.00716.86
8.0.60.0030.00616.62
8.0.50.0020.00516.80
8.0.30.0060.01716.99
8.0.20.0100.00817.40
8.0.10.0030.00516.84
8.0.00.0130.00316.62
7.4.330.0060.00014.78
7.4.320.0070.00016.30
7.4.300.0070.00016.40
7.4.290.0030.00316.41
7.4.280.0040.00416.47
7.4.270.0070.00016.45
7.4.260.0030.00313.15
7.4.250.0060.00316.17
7.4.240.0040.00416.38
7.4.230.0040.00416.24
7.4.220.0120.00616.28
7.4.210.0070.01016.35
7.4.200.0050.00316.49
7.4.190.0030.00316.15
7.4.160.0120.00616.18
7.4.150.0090.00917.40
7.4.140.0090.00817.86
7.4.130.0080.00816.34
7.4.120.0080.00816.28
7.4.110.0080.00816.36
7.4.100.0100.00716.30
7.4.90.0100.00716.51
7.4.80.0060.01319.04
7.4.70.0060.01016.39
7.4.60.0160.00016.21
7.4.50.0000.00816.13
7.4.40.0000.01422.27
7.4.30.0110.01416.54
7.4.00.0110.00614.54
7.3.330.0030.00313.02
7.3.320.0030.00312.85
7.3.310.0040.00216.18
7.3.300.0040.00416.06
7.3.290.0060.00916.04
7.3.280.0110.00516.09
7.3.270.0140.00317.40
7.3.260.0130.00718.24
7.3.250.0120.00816.26
7.3.240.0130.00716.28
7.3.230.0130.00316.39
7.3.210.0030.01316.30
7.3.200.0150.00619.39
7.3.190.0040.01616.41
7.3.180.0120.00316.29
7.3.170.0150.00616.27
7.3.160.0090.00616.04
7.3.120.0040.01314.89
7.2.330.0110.00616.63
7.2.320.0130.00716.31
7.2.310.0130.01016.40
7.2.300.0040.01216.63
7.2.290.0080.00816.53
7.2.00.0030.01419.40
7.1.200.0030.00815.38
7.1.100.0090.00017.94
7.1.70.0160.00416.90
7.1.60.0100.01319.40
7.1.50.0070.01317.05
7.1.00.0030.05722.36
7.0.200.0000.00916.70
7.0.140.0070.07021.90
7.0.80.0070.04719.97
7.0.70.0030.09320.05
7.0.60.0200.07319.95
7.0.50.0100.09020.25
7.0.40.0200.06720.05
7.0.30.0130.07720.04
7.0.20.0070.07720.15
7.0.10.0100.07720.18
7.0.00.0070.08020.10
5.6.280.0000.07721.12
5.6.230.0200.08320.73
5.6.220.0100.08020.75
5.6.210.0070.08020.70
5.6.200.0070.08721.13
5.6.190.0070.09021.07
5.6.180.0070.04321.01
5.6.170.0070.08021.13
5.6.160.0200.07021.11
5.6.150.0070.06721.03
5.6.140.0130.07721.03
5.6.130.0100.07021.11
5.6.120.0100.08021.11
5.6.110.0070.09021.07
5.6.100.0100.07321.08
5.6.90.0070.08320.94
5.6.80.0100.06320.50
5.6.70.0130.08020.39
5.6.60.0100.07320.39
5.6.50.0130.08320.51
5.6.40.0130.07020.48
5.6.30.0030.04020.41
5.6.20.0200.06720.40
5.6.10.0070.08020.44
5.6.00.0070.07720.41
5.5.370.0070.06320.42
5.5.360.0100.08720.42
5.5.350.0070.07720.49
5.5.340.0100.07020.76
5.5.330.0030.08320.66
5.5.320.0070.04020.80
5.5.310.0170.07320.66
5.5.300.0100.07720.89
5.5.290.0200.08320.93
5.5.280.0030.09020.80
5.5.270.0030.04320.81
5.5.260.0070.07720.84
5.5.250.0100.07320.71
5.5.240.0070.06720.04
5.5.230.0030.08720.16
5.5.220.0070.07720.23
5.5.210.0070.08020.04
5.5.200.0100.08020.10
5.5.190.0030.06020.14
5.5.180.0170.07720.18
5.5.160.0100.07720.24
5.5.150.0070.08020.14
5.5.140.0070.08020.24
5.5.130.0170.07320.29
5.5.120.0100.07720.15
5.5.110.0070.07720.25
5.5.100.0130.06320.15
5.5.90.0070.03720.14
5.5.80.0070.05019.96
5.5.70.0170.05720.09
5.5.60.0070.07720.08
5.5.50.0170.07020.02
5.5.40.0070.06720.07
5.5.30.0070.07019.97
5.5.20.0200.07020.14
5.5.10.0100.07020.09
5.5.00.0200.06719.97
5.4.450.0100.07319.06
5.4.440.0070.08019.27
5.4.430.0070.04019.24
5.4.420.0000.09019.32
5.4.410.0100.07319.10
5.4.400.0070.07718.92
5.4.390.0170.07018.78
5.4.380.0070.06018.92
5.4.370.0100.08319.02
5.4.360.0070.07718.95
5.4.350.0100.06319.10
5.4.340.0030.08018.88
5.4.320.0100.07318.71
5.4.310.0100.07318.95
5.4.300.0030.07718.99
5.4.290.0070.07718.74
5.4.280.0100.07718.88
5.4.270.0170.06318.86
5.4.260.0100.06719.00
5.4.250.0100.03718.89
5.4.240.0070.03719.04
5.4.230.0030.07718.91
5.4.220.0030.07718.73
5.4.210.0030.07319.04
5.4.200.0070.07718.90
5.4.190.0130.07718.70
5.4.180.0100.07018.96
5.4.170.0000.08718.94
5.4.160.0100.07018.86
5.4.150.0100.03318.88
5.4.140.0130.04316.07
5.4.130.0070.06716.32
5.4.120.0070.07316.28
5.4.110.0130.06716.16
5.4.100.0130.06716.28
5.4.90.0130.06716.35
5.4.80.0170.04716.35
5.4.70.0070.06016.11
5.4.60.0100.06016.23
5.4.50.0070.07716.21
5.4.40.0070.07016.27
5.4.30.0130.04316.26
5.4.20.0170.06716.16
5.4.10.0100.07016.29
5.4.00.0030.05015.75
5.3.290.0170.06314.36
5.3.280.0070.05314.41
5.3.270.0070.07014.47
5.3.260.0100.07714.29
5.3.250.0030.09014.36
5.3.240.0170.03014.26
5.3.230.0070.08014.36
5.3.220.0170.06314.23
5.3.210.0130.07014.38
5.3.200.0170.06714.43
5.3.190.0100.07314.42
5.3.180.0000.09714.21
5.3.170.0070.07014.26
5.3.160.0000.08014.42
5.3.150.0030.08014.37
5.3.140.0030.07714.32
5.3.130.0070.06314.33
5.3.120.0000.05314.36
5.3.110.0030.07714.30
5.3.100.0070.07713.72
5.3.90.0030.05013.77
5.3.80.0130.05313.85
5.3.70.0100.07313.88
5.3.60.0000.06713.75
5.3.50.0130.06713.79
5.3.40.0070.07313.60
5.3.30.0100.07013.70
5.3.20.0030.07313.50
5.3.10.0100.07013.50
5.3.00.0070.03313.29
5.2.170.0030.06010.98
5.2.160.0230.06010.95
5.2.150.0030.06310.98
5.2.140.0100.05310.95
5.2.130.0100.05310.95
5.2.120.0030.06010.95
5.2.110.0100.06011.01
5.2.100.0100.03711.01
5.2.90.0000.07710.95
5.2.80.0000.05710.95
5.2.70.0100.05710.95
5.2.60.0030.05010.95
5.2.50.0070.06310.95
5.2.40.0030.06310.95
5.2.30.0130.05310.95
5.2.20.0070.05710.95
5.2.10.0030.06310.95
5.2.00.0030.06010.95
5.1.60.0070.04710.95
5.1.50.0070.0539.91
5.1.40.0100.0479.92
5.1.30.0030.06310.18
5.1.20.0000.05310.20
5.1.10.0000.0309.93
5.1.00.0030.0309.94
5.0.50.0000.0539.93
5.0.40.0000.0479.93
5.0.30.0000.0679.93
5.0.20.0000.0509.93
5.0.10.0000.0509.93
5.0.00.0030.0679.93
4.4.90.0070.03010.95
4.4.80.0030.03310.95
4.4.70.0000.04010.95
4.4.60.0030.03710.95
4.4.50.0000.03710.95
4.4.40.0030.0479.90
4.4.30.0030.0379.91
4.4.20.0000.0239.93
4.4.10.0100.0309.93
4.4.00.0100.0439.93
4.3.110.0030.0339.93
4.3.100.0070.0309.93
4.3.90.0070.0339.93
4.3.80.0000.0539.93
4.3.70.0070.0279.93
4.3.60.0030.0379.93
4.3.50.0000.0379.93
4.3.40.0070.0479.93
4.3.30.0030.0339.93
4.3.20.0030.0339.93
4.3.10.0070.0309.93
4.3.00.0030.0339.93

preferences:
54.16 ms | 401 KiB | 5 Q