Add scalar function to the database connection interface (#47590)

Author: GrahamCampbell

src/Illuminate/Database/ConnectionInterface.php

@@ -33,6 +33,18 @@ public function raw($value);
      */
     public function selectOne($query, $bindings = [], $useReadPdo = true);
 
+    /**
+     * Run a select statement and return the first column of the first row.
+     *
+     * @param  string  $query
+     * @param  array  $bindings
+     * @param  bool  $useReadPdo
+     * @return mixed
+     *
+     * @throws \Illuminate\Database\MultipleColumnsSelectedException
+     */
+    public function scalar($query, $bindings = [], $useReadPdo = true);
+
     /**
      * Run a select statement against the database.
      *