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run code in 300+ PHP versions simultaneously
<?php var_dump(__DIR__); var_dump(realpath(null), realpath(false), realpath(''));
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(3) "/in" Deprecated: realpath(): Passing null to parameter #1 ($path) of type string is deprecated in /in/AZp6W on line 4 Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/AZp6W on line 4 Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/AZp6W on line 4 Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/AZp6W on line 4 bool(false) bool(false) bool(false)
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30
string(3) "/in" Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/AZp6W on line 4 Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/AZp6W on line 4 Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/AZp6W on line 4 bool(false) bool(false) bool(false)
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 7.3.32 - 7.3.33, 7.4.33, 8.0.13
string(3) "/in" string(1) "/" string(1) "/" string(1) "/"
Output for 5.2.3 - 5.2.17
Notice: Use of undefined constant __DIR__ - assumed '__DIR__' in /in/AZp6W on line 3 string(7) "__DIR__" string(1) "/" string(1) "/" string(1) "/"
Output for 5.2.1 - 5.2.2
Notice: Use of undefined constant __DIR__ - assumed '__DIR__' in /in/AZp6W on line 3 string(7) "__DIR__" string(3) "/in" string(3) "/in" string(3) "/in"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
Notice: Use of undefined constant __DIR__ - assumed '__DIR__' in /in/AZp6W on line 3 string(7) "__DIR__" bool(false) bool(false) bool(false)

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308.93 ms | 402 KiB | 459 Q