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run code in 300+ PHP versions simultaneously
<?php $subdir = 'rasmus'; $file = 'phpfi'; class _ { const DIR = __DIR__; } echo "{${'_'::DIR}}/{$subdir}/{$file}\n"; ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: Undefined variable $/in in /in/2mMKb on line 8 /rasmus/phpfi
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 Warning: Undefined variable $/in in /in/2mMKb on line 8 /rasmus/phpfi
Output for 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 - 7.4.33
Notice: Undefined variable: /in in /in/2mMKb on line 8 /rasmus/phpfi
Output for 7.3.32 - 7.3.33
/rasmus/phpfi
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) in /in/2mMKb on line 8
Process exited with code 255.

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