mysqli::$connect_errno

定义和用法

connect_errno / mysqli_connect_errno() 函数返回上一次连接错误的错误代码（如果有）。

实例

例子 1 - 面向对象风格

返回上一次连接错误的错误代码（如果有）：

<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");

// 检查连接
if ($mysqli -> connect_errno) {
  echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
  exit();
}
?>

例子 2 - 过程式风格

返回上一次连接错误的错误代码（如果有）：

<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");

// 检查连接
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  exit();
}
?>