Replace all uses of like_escape() with $wpdb->esc_like().

Props miqrogroove.
See #10041.


git-svn-id: https://develop.svn.wordpress.org/trunk@28712 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/comment.php

@@ -481,11 +481,11 @@ class WP_Comment_Query {
 	 * @return string
 	 */
 	protected function get_search_sql( $string, $cols ) {
-		$string = esc_sql( like_escape( $string ) );
+		global $wpdb;
 
 		$searches = array();
 		foreach ( $cols as $col )
-			$searches[] = "$col LIKE '%$string%'";
+			$searches[] = $wpdb->prepare( "$col LIKE %s", $wpdb->esc_like( $string ) );
 
 		return ' AND (' . implode(' OR ', $searches) . ')';
 	}