Coding Standards: Use strict comparisons in path_is_absolute().

This patch adjusts conditions to use strict comparisons when comparing `realpath()` in `path_is_absolute()`.

Props jrf.
See #36308.


Built from https://develop.svn.wordpress.org/trunk@53946


git-svn-id: http://core.svn.wordpress.org/trunk@53505 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -2101,11 +2101,11 @@ function path_is_absolute( $path ) {
 	 * This is definitive if true but fails if $path does not exist or contains
 	 * a symbolic link.
 	 */
-	if ( realpath( $path ) == $path ) {
+	if ( realpath( $path ) === $path ) {
 		return true;
 	}
 
-	if ( strlen( $path ) == 0 || '.' === $path[0] ) {
+	if ( strlen( $path ) === 0 || '.' === $path[0] ) {
 		return false;
 	}