3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo; define('Foo\\true',false,true); $k = true; var_dump($k); $a = 0; var_dump('' == $a and 'a' == $a and '' === (string)$a and 'a' === (string)$a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /in/JLe8G on line 3 bool(true) bool(false)
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: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /in/JLe8G on line 3 bool(true) bool(false)
Output for 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Deprecated: define(): Declaration of case-insensitive constants is deprecated in /in/JLe8G on line 3 bool(true) bool(false)
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.32 - 7.3.33
bool(true) bool(false)
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
bool(false) bool(false)

preferences:
176.94 ms | 402 KiB | 243 Q