RE: Plugins Dependencies.
The following micro-optimization improvements are included for finding each plugin's file relative to the plugins' directory within `wp-settings.php`:
* Move `trailingslashit()` before `foreach()`.
The path to the plugin directory is a constant. Invoking the `trailingslashit()` within the loop for each plugin is unnecessary and less performant.
This commit moves the plugin directory logic to before the loop. The result: the logic will now run 1x instead of Px where P represents the number of active and valid plugins to be loaded.
* Use `substr()` instead of `str_replace()` to extract the plugin's file relative to the plugins' directory.
`substr()` is more performant than `str_replace()`.
Why?
Per the PHP handbook:
>"This function returns a string or an array with all occurrences of search in subject replaced with the given replace value."
`str_replace()` searches the entire string to find and replace each substring occurrence.
whereas
>"Returns the portion of string specified by the offset and length parameters."
`substr()` starts at the given offset and stops at the given (or end of the) string length.
In other words, `substr()` iterates over less of and only a specific portion of the given input string, whereas `str_replace()` iterates through the entire string searching for matches (plural).
References:
* `str_replace()` https://www.php.net/manual/en/function.str-replace.php
* `substr()` https://www.php.net/manual/en/function.substr.php
* `strlen()` https://www.php.net/manual/en/function.strlen.php
* Show the comparison in action https://3v4l.org/TbQ9U.
Follow-up to [57545], [57592].
Props hellofromTonya, costdev.
Fixes#60510.
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