Add dynamic return type for generic functions

[johnbillion]

There are several generic functions in WordPress that return a value of the same type as passed in. Here's my list so far:

• addslashes_gpc()
• map_deep()
• rawurlencode_deep()
• sanitize_category()
• sanitize_post()
• sanitize_term()
• stripslashes_deep()
• urldecode_deep()
• urlencode_deep()
• wp_slash()
• wp_unslash()

We should be able to come up with a dynamic return type extension which makes the function behave like a generic and return the same type as passed in.

[szepeviktor]

the same type as passed in

Is this type always string|array?

[johnbillion]

Looks like it, yes. Mostly yes, but some functions accept and return objects and any scalar too.

[szepeviktor]

/**
 * @template TStripslashesDeep of string|array
 * @param TStripslashesDeep $value
 * @return TStripslashesDeep
 */
function stripslashes_deep( mixed $value ) {}