PHP5中文手册

实例

返回最近调用函数的最后一个错误代码：

 <?PHP
 $con=mysqli_connect("localhost","my_user","my_password","my_db");
 // Check connection
 if (mysqli_connect_errno($con))
 {
 echo "Failed to connect to MySQL: " . mysqli_connect_error();
 }

// Perform a query, check for error
if (!mysqli_query($con,"INSERT INTO Persons (FirstName) VALUES ('Glenn')"))
 {
 echo("Errorcode: " . mysqli_errno($con));
 }

mysqli_close($con);
 ?>