Ticket #20850: 20850.patch

wp-includes/taxonomy.php

@@ -1479 +1479 @@
         if ( '' === $slug = sanitize_title($term) )
                 return 0;
 
-        $where = 't.slug = %s';
-        $else_where = 't.name = %s';
-        $where_fields = array($slug);
-        $else_where_fields = array($term);
+        $where = 't.name LIKE BINARY %s';
+        $else_where = 't.slug = %s';
+        $where_fields = array($term);
+        $else_where_fields = array($slug);
         if ( !empty($taxonomy) ) {
                 $parent = (int) $parent;
                 if ( $parent > 0 ) {
@@ -2056 +2056 @@
                 }
         }
 
-        if ( $term_id = term_exists($slug) ) {
+        if ( $term_id = term_exists($name) ) {
                 $existing_term = $wpdb->get_row( $wpdb->prepare( "SELECT name FROM $wpdb->terms WHERE term_id = %d", $term_id), ARRAY_A );
                 // We've got an existing term in the same taxonomy, which matches the name of the new term:
                 if ( is_taxonomy_hierarchical($taxonomy) && $existing_term['name'] == $name && $exists = term_exists( (int) $term_id, $taxonomy ) ) {