PHP 中的 mysqli_error函数

mysqli_error - 语法

mysqli_error(connection);

它返回上次连接的错误列表

mysqli_error - 返回值

它返回一个包含错误描述的字符串。

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mysqli_error - 示例

<?php
   $connection_mysql=mysqli_connect("host_name","user","password","db");
   
   if (mysqli_connect_errno($connection_mysql)){
      echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }
   
   if (!mysqli_query($connection_mysql,"INSERT INTO Persons (FirstName) VALUES ('Jack')")){
      echo("Error description: " . mysqli_error($connection_mysql));
   }
   
   mysqli_close($connection_mysql);
?>