Add in_array() to list of auto-escaped functions
Add in_array() to list of auto-escaped functions

Say you have code like this:

```php
if ( isset( $_REQUEST['foo'] ) && in_array( $_REQUEST['foo'], $array ) ) {
	$foo = sanitize_key( $_REQUEST['foo'] );
}
```
This is safe, but the use of the raw `$_REQUEST['foo']` value in `in_array()` would be flagged. Adding `in_array()` to the list of auto-escaped functions avoids this.
xwp/WordPress-Coding-Standards,xwp/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards,mediarain/WordPress-Coding-Standards,mediarain/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,xwp/WordPress-Coding-Standards,xwp/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards