An article introducing the error log settings in php.ini

php.ini is the PHP configuration file, used to configure the PHP running environment. During the PHP development process, you will inevitably encounter errors or exceptions. At this time, you need to check the error log to locate the problem.

This article will introduce the error log settings in php.ini, including how to turn on error logging, how to view the error log, common error types in the error log and how to solve these errors.

1. Turn on error logging

By default, PHP will not log error information, so it needs to be turned on manually. In the php.ini file, find the following settings, uncomment and set them as follows:

display_errors = Off
log_errors = On
error_log = /path/to/error_log

Among them, display_errors is used to control whether error messages are displayed in the browser, It is generally recommended to turn it off to prevent leakage of sensitive information. log_errors is used to control whether to log error information to the log file. It is recommended to enable it. error_logSpecify the path and file name of the error log file, which can be modified according to the actual situation.

After enabling it, restart the PHP service to take effect.

2. Check the error log

With the error log file, you need to check and analyze the information in time. The error log generally records various errors that occur when PHP is running and their corresponding locations and types.

Common error types are:

1. E_NOTICE
   This is one of the most common error types in PHP, usually when the variable is undefined or the variable value is null. .
2. E_WARNING
   This type of error is generally caused by calling a method or function that does not exist, or passing wrong parameters or types.
3. E_ERROR
   This error indicates that a serious error occurred during runtime, causing the program to be unable to continue execution.

After seeing the error message, you need to analyze the type and location of the error, and gradually debug and modify the code.

3. Common error types and solutions in error logs

1. Undefined variable
   This error means that the variable is not defined or assigned a value. You can modify the code or declare the variable. way to solve it.
2. Call to undefined function
   This error indicates that an undefined function is called, which can be solved by importing the corresponding file or installing the corresponding extension.
3. Call to undefined method
   This error indicates that an undefined method is called, which can be solved by defining the corresponding method or modifying the calling method.
4. Fatal error: Maximum execution time of 30 seconds exceeded in
   This error indicates that the program execution has timed out and can be solved by modifying the max_execution_time parameter in the PHP configuration file.

In real environments, errors and exceptions are often more complex, and solutions must be based on the actual situation. Therefore, sufficient experience and skills are required for code debugging and problem solving.

Summary

This article introduces the error log settings in php.ini, including how to turn on error logging, how to view the error log, common error types in the error log and how to solve these errors. In the PHP development process, error handling is a very important part. Sufficient error logging and analysis can help developers quickly locate and solve problems.

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