相关疑难解决方法(0)

引号"和"之间的区别是什么？怎么样？使用不同的引号和"下面是否有错误？"

 $result = pg_query_params($dbconn,
      'INSERT INTO users 
      (username, email, passhash_md5)
      VALUES ($1, $2, $3)',
          array($username, $email, $passhash_md5
      )


      $result = pg_query_params( $dbconn,
          "SELECT user_id
           FROM users
          WHERE email = $1",
          array( $email )
          )