Hide PHP Errors From Visitors

Turns off on-screen PHP warnings and errors for everyone except logged-in administrators, so file paths are never shown to the public.

Code

if ( ! ( is_user_logged_in() && current_user_can( 'manage_options' ) ) ) {
    ini_set( 'display_errors', '0' );
}

Errors are still written to the error log if logging is enabled.

Install WPIDE on your WordPress site (it is free) and open Code Snippets.
Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
It is added inactive: review the code and settings, then switch it on.