Specify that PHP 7.2 is the minimum version

Co-authored-by: Felix Arntz <[email protected]>

Author: westonruter

AGENTS.md

@@ -73,7 +73,7 @@ Every file, function, class, method constant, and global variable must have an a
 
 Follow coding conventions in WordPress core. Namespaces are generally not used, as they are not normally used in WordPress core code. Procedural programming patterns are favored where classes play a supporting role, rather than everything being written in OOP.
 
-Whenever possible, the most specific PHP type hints should be used, when compatible with the minimum version of PHP supported by WordPress, unless the `testVersion` config in `phpcs.xml.dist` is higher. When native PHP type cannot be used, PHPStan's [PHPDoc Types](https://phpstan.org/writing-php-code/phpdoc-types) should be used, including not only the basic types but also subtypes like `non-empty-string`, [integer ranges](https://phpstan.org/writing-php-code/phpdoc-types#integer-ranges), [general arrays](https://phpstan.org/writing-php-code/phpdoc-types#general-arrays), and especially [array shapes](https://phpstan.org/writing-php-code/phpdoc-types#array-shapes). The types should comply with PHPStan's level 10. The one exception for using PHP types is whenever a function is used as a filter. Since plugins can supply any value at all when filtering, use the expected type with a union to `mixed`. The first statement in the function in this case must always check the type, and if it is not the expected type, override it to be so.
+Whenever possible, the most specific PHP type hints should be used, when backward compatible with PHP 7.2, the minimum version of PHP supported by WordPress and this repository. When native PHP type cannot be used, PHPStan's [PHPDoc Types](https://phpstan.org/writing-php-code/phpdoc-types) should be used, including not only the basic types but also subtypes like `non-empty-string`, [integer ranges](https://phpstan.org/writing-php-code/phpdoc-types#integer-ranges), [general arrays](https://phpstan.org/writing-php-code/phpdoc-types#general-arrays), and especially [array shapes](https://phpstan.org/writing-php-code/phpdoc-types#array-shapes). The types should comply with PHPStan's level 10. The one exception for using PHP types is whenever a function is used as a filter. Since plugins can supply any value at all when filtering, use the expected type with a union to `mixed`. The first statement in the function in this case must always check the type, and if it is not the expected type, override it to be so.
 
 Never render HTML `SCRIPT` tags directly in HTML. Always use the relevant APIs in WordPress for adding scripts, including `wp_enqueue_script()`, `wp_add_inline_script()`, `wp_localize_script()`, `wp_print_script_tag()`, `wp_print_inline_script_tag()`, `wp_enqueue_script_module()` among others. Favor modules over classic scripts.