Fix a few incorrectly-merged mysql queries

@@ -32,7 +32,7 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
     protected $count    = 0;
     protected $num_rows = 0;
 
-    protected $fields   = Array();
+    protected $fields   = [];
 
     protected $userclass = 'User';
 
@@ -91,7 +91,7 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
             }
         }
 
-        mysql_query("SET SESSION group_concat_max_len = 40960", $wpdb->dbh);
+        mysqli_query("SET SESSION group_concat_max_len = 40960", $wpdb->dbh);
 
         $query = "
           SELECT SQL_CALC_FOUND_ROWS
@@ -119,11 +119,11 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
                  {$limit_clause}
         ";
 
-        $this->result   = mysql_query($query, $wpdb->dbh);
-        $this->num_rows = mysql_num_rows($this->result);
+        $this->result   = mysqli_query($wpdb->dbh, $query);
+        $this->num_rows = mysqli_num_rows($this->result);
 
-        $count_result = mysql_query("SELECT FOUND_ROWS()", $wpdb->dbh);
-        list($this->count) = mysql_fetch_row($count_result);
+        $count_result = mysqli_query($wpdb->dbh, "SELECT FOUND_ROWS()");
+        list($this->count) = mysqli_fetch_row($count_result);
     }
 
     public function setUserClass($classname) {
@@ -154,7 +154,7 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
         $this->current = 0;
 
         if ($this->num_rows > 0) {
-            mysql_data_seek($this->result, 0);
+            mysqli_data_seek($this->result, 0);
         }
     }
 
@@ -176,10 +176,10 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
         }
 
         if ($offset != $this->pos) {
-            mysql_data_seek($this->result, $offset);
+            mysqli_data_seek($this->result, $offset);
         }
 
-        list($user_id, $user_string) = mysql_fetch_row($this->result);
+        list($user_id, $user_string) = mysqli_fetch_row($this->result);
         $user_string = str_ireplace("\\'", "\\\\'", $user_string);
         $json_data = json_decode($user_string, true);
         if (json_last_error() != JSON_ERROR_NONE) {