Cron作業返回錯誤消息

Question

我試圖通過cron作業連接到我的數據庫。但是我不斷收到一條錯誤消息。經過許多令人沮喪的時間後在這裏張貼求助。

我的cron腳本PHP文件：

<?php 
define("HOST","localhost"); 
define("USERNAME","user_muser"); 
define("PASSWORD","*********"); 
define("DB_DATABASE","databasename"); 

$conn = mysqli_connect('HOST', 'USERNAME', 'PASSWORD','DB_DATABASE'); 

// Check connection 
if (mysqli_connect_errno()) 
{ 
"Failed to connect to MySQL: " . mysqli_connect_error(); 
} 
// Check if server is alive 
if (mysqli_ping($conn)) 
{ 
"Connection is ok!"; 
} 
else 
{ 
"Error: ". mysqli_error($conn); 
} 
mysqli_close($conn); 
?> 

這是我收到的錯誤：

mysqli_connect(): (HY000/2005): Unknown MySQL server host 'HOST' (0) 
mysqli_ping() expects parameter 1 to be mysqli 
mysqli_error() expects parameter 1 to be mysqli 
mysqli_close() expects parameter 1 to be mysqli 

任何幫助嗎？謝謝！

Answer 1

你在引用常量，這使得它們成爲字符串。

define("HOST","localhost"); 
define("USERNAME","user_muser"); 
define("PASSWORD","*********"); 
define("DB_DATABASE","databasename"); 

$conn = mysqli_connect(HOST, USERNAME, PASSWORD, DB_DATABASE); 

Answer 2

你應該在引號外寫下constants如下。否則，他們通常是字符串。

$conn = mysqli_connect(HOST, USERNAME, PASSWORD,DB_DATABASE);