PHP 7 error handling tips: How to set the error reporting level using the error_reporting function

PHP 7 error handling skills: How to use the error_reporting function to set the error reporting level

In PHP development, error handling is a very important part. Properly setting the error reporting level can help us discover and solve problems in the program in a timely manner, and improve the stability and security of the program. In PHP 7, we can use the error_reporting function to set the error reporting level. This article describes how to use this function to handle errors flexibly.

In PHP 7, the usage of error_reporting function has some changes compared to previous versions. In previous versions, we could set the error reporting level through the error_reporting function, as shown below:

error_reporting(E_ALL);

At this time, the error reporting level we set is E_ALL, All errors, warnings and prompts will be displayed. This level is intended for development environments and helps us better track and fix issues.

However, in a production environment, we do not want to display all error messages because this may expose sensitive information to attackers. Therefore, we can set the error reporting level as needed and only display the information we care about.

The following are some common error reporting levels:

E_ALL: Display all error, warning and prompt information.
E_ERROR: Only fatal errors are displayed.
E_WARNING: Only display warning information.
E_NOTICE: Only display prompt information.
E_PARSE: Only display parsing errors.
E_CORE_ERROR: Only core errors are displayed.
E_CORE_WARNING: Only core warnings are displayed.
E_COMPILE_ERROR: Only display compilation errors.
E_COMPILE_WARNING: Only compile warnings are displayed.

We can choose the appropriate error reporting level to set according to actual needs.

The following is a sample code that demonstrates how to use the error_reporting function to set the error reporting level:

// 设置错误报告级别为显示所有错误、警告和提示信息
error_reporting(E_ALL);

// 打开一个不存在的文件，触发一个警告
$file = fopen("nonexistent.txt", "r");

// 在代码中访问一个不存在的变量，触发一个提示
echo $nonexistentVariable;

// 执行一个除以0的操作，触发一个致命错误
echo 1 / 0;

// 在代码中直接输出一条错误信息，触发一个解析错误
echo "This is a parse error" ;

Run the above sample code, we will get the following output:

Warning: fopen(nonexistent.txt): failed to open stream: No such file or directory in /path/to/file.php on line 5

Notice: Undefined variable: nonexistentVariable in /path/to/file.php on line 8

Fatal error: Uncaught Error: Division by zero in /path/to/file.php:11

Parse error: syntax error, unexpected ' ; ' in /path/to/file.php on line 15

By setting different error reporting levels, we can freely switch the displayed error information. This is very helpful for daily development work and troubleshooting.

To sum up, by setting the error reporting level appropriately, we can flexibly handle errors in PHP 7. In the development environment, setting the error reporting level to E_ALL can help us quickly find problems and improve development efficiency. In a production environment, we should choose an appropriate error reporting level to only display the information we care about and avoid leaking sensitive data. Through the error_reporting function, we can easily implement these settings and handle different levels of errors in the program.

I hope this article will help you understand and use the error handling skills of PHP 7!

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