What are the causes of 500 errors in PHP?

Causes for php 500 error: 1. The PHP program has syntax errors. Just expose the error message and solve the problem based on the information; 2. Insufficient disk space and insufficient space to read and write data. 500 error.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

For http requests, the error status code is 500, usually The explanation is: It means that the server encountered an error and could not complete the request (ie, an internal server error), but the specific problems need to be analyzed in detail. Here are some 500 problems and solutions.

1. PHP program syntax error leads to

Scenario 1: Our project is set up with alarm monitoring (regularly access a fixed link of the website every 10 minutes), once For a period of time, I would receive emails reporting 500 errors two or three times a day, but when I manually accessed them again, the access was normal...

This should be the most common error, and grammatical errors can also appear quickly. , as long as the error message is exposed, the problem can be solved immediately.

If it is in a local or test environment, this is usually how we handle it. Just set the output error message in the program entry:

error_reporting(E_ALL ^ E_NOTICE);
//禁止把错误输出到页面
ini_set('display_errors', 0);
//设置错误信息输出到文件
ini_set('log_errors', 1);
//指定错误日志文件名
$error_dir = '/logs/err/';
$error_file = $error_dir . date('Ymd').'.log';
//目录不存在就创建
if (!is_dir($error_dir)){
    mkdir($error_dir, 0777, true);
}
//文件不存在就创建之
if(!file_exists($error_file)){
    $fp = fopen($error_file, 'w+');
    if($fp){
        fclose($fp);
    }
}
//设置错误输出文件
ini_set("error_log", $error_file);
//程序正常执行逻辑......

2. The disk is full causing

Scenario 2: When uploading pictures, an error of 500 is always reported.

500 errors caused by insufficient disk space and insufficient space to read and write data are extremely uncommon and difficult to detect in time. Usually when encountering the 500 error, the first thing that comes to mind is a program error. In fact, it may also be due to insufficient disk space. If you find any problems in the program, you can check whether it is due to insufficient disk space~

df -h Check disk space usage

Recommended study: "PHP Video Tutorial"

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