Detailed explanation of PHP error logs and how to obtain useful information

As a PHP developer, you will inevitably encounter errors during the development process. At this time, the error log becomes an important reference for us to solve the problem. In this article, we will explain the PHP error log method and how to obtain useful information.

1. Enable PHP error log

By default, PHP does not enable the error log function. In order to enable the error log, we need to modify the PHP configuration file php.ini. We can find its location by searching for the php.ini file.

Find the following line in the php.ini file:

;error_log = php_errors.log

Remove the semicolon and specify the path to an error log file, for example:

error_log = /var/log/php_errors.log

Then, change the log Just point the file path to the location where you want to store the error log.

2. Output error information to the page

Sometimes, we need to view the error message and see the specific location on the page. In the development environment, we can use the following method to output error information to the page:

ini_set('display_errors', 1);
error_reporting(E_ALL);

This means that all errors will be displayed and output on the page.

This option is very useful when we are working in a development environment, but in a production environment, this option needs to be disabled to avoid disclosing sensitive information on the page.

3. PHP error level

PHP error log records different levels of error information. Different log levels record different error types so that we can better classify and analyze errors.

The following are PHP error levels:

• E_ERROR: Fatal error that will cause the script to stop executing.
• E_WARNING: Non-fatal error, but continued execution of the script may result in a more serious situation.
• E_NOTICE: Triggers a PHP warning, which may cause semantic problems.
• E_PARSE: Syntax error, parsing failed.
• E_DEPRECATED: Code or functionality that may no longer be supported in future releases.

We can use the error_reporting function to set the PHP error level to record different types of errors.

4. Log analysis tool

When we encounter error problems during the development process, it is a very effective method to find the cause of the error through logs. However, log files are usually large and contain a lot of information, making manual search time-consuming.

Fortunately, we can use some log analysis tools to help us find useful information faster.

The following are some commonly used log analysis tools:

• Kibana: Provides a series of powerful data visualization and exploration functions.
• Graylog: Open source log management and data analysis tool for Linux and Windows.
• Logstash: Can collect and manage log data from multiple sources.

These tools can help us quickly locate error messages and perform processing operations quickly.

Summary

Opening the PHP error log and handling it in a timely manner is one of the basic requirements for good PHP development. Through the above methods, we can record and analyze errors and locate problems. Solving these problems in time will help us improve development efficiency and reduce error rates. Hope this article is helpful to you.

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