3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo "before\n"; var_dump(realpath(__DIR__.'/..')); var_dump(realpath('./')); chdir('/tmp'); echo "after\n"; var_dump(realpath(__DIR__.'/..')); var_dump(realpath('./'));
Output for 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, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
before Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/FsJJ2 on line 3 bool(false) Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/FsJJ2 on line 4 bool(false) after Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/FsJJ2 on line 9 bool(false) string(4) "/tmp"
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 before Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/FsJJ2 on line 3 bool(false) Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/FsJJ2 on line 4 bool(false) after Warning: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp:/in:/etc) in /in/FsJJ2 on line 9 bool(false) string(4) "/tmp"
Output for 7.3.32 - 7.3.33, 7.4.33, 8.0.13
before string(1) "/" string(1) "/" after string(1) "/" string(4) "/tmp"

preferences:
265.31 ms | 401 KiB | 291 Q