3v4l.org

run code in 300+ PHP versions simultaneously
<?php $locales = ['en', 'en-us', 'en_US', 'en-us.x-something']; foreach($locales as $orig) { $normalized = Locale::canonicalize($orig); echo "ORIG: $orig, normalized: $normalized".PHP_EOL; }
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, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
ORIG: en, normalized: en ORIG: en-us, normalized: en_US ORIG: en_US, normalized: en_US ORIG: en-us.x-something, normalized: en_US
Output for 8.0.13
Fatal error: Uncaught Error: Class "Locale" not found in /in/t6ePI:5 Stack trace: #0 {main} thrown in /in/t6ePI on line 5
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.33
Fatal error: Uncaught Error: Class 'Locale' not found in /in/t6ePI:5 Stack trace: #0 {main} thrown in /in/t6ePI on line 5
Process exited with code 255.

preferences:
224.79 ms | 401 KiB | 326 Q