How to use debugging tools in PHP programming?

Using debugging tools in PHP programming can help developers better understand and debug code, improve development efficiency and code quality. This article will introduce how to use common PHP debugging tools.

1. Xdebug

Xdebug is one of the most popular tools in PHP debugging. It can help developers debug and perform performance analysis of PHP code. Its main functions include:

• Debugging: You can set breakpoints in PHP code and conduct line-by-line debugging.
• Variable tracking: You can track variable assignment and usage.
• Stack trace: You can view the stack during code execution.
• Performance analysis: You can count resource consumption during code execution, such as execution time, memory usage, number of function calls, etc.

Using Xdebug requires adding relevant configurations to the PHP configuration file. For example, in the Ubuntu environment, you can edit the /etc/php/7.2/mods-available/xdebug.ini file and add the following content:

zend_extension=xdebug.so
xdebug.remote_enable=1
xdebug.remote_autostart=1
xdebug.remote_port=9000
xdebug.idekey=PHPSTORM

Among them, xdebug.remote_enable is to enable Xdebug remote debugging mode, xdebug. remote_autostart is to automatically start debugging, xdebug.remote_port is the debugging port, and xdebug.idekey is the IDE key of the debugging tool (here, PHPStorm is taken as an example).

In PHPStorm, you can connect Xdebug to PHPStorm by setting the PHP Remote Debug configuration. For specific steps, please refer to the official PHPStorm documentation.

2. Visual Studio Code

Visual Studio Code (VS Code for short) can also be used as a PHP debugging tool. VS Code’s debugging capabilities support multiple languages, including PHP. By installing the PHP Debug plug-in in VS Code, you can debug PHP code.

The specific steps are as follows:

• Install the PHP Debug plug-in in VS Code
• Set breakpoints in the PHP code
• Start the debugger, And select "PHP" as the debugging type
• Configure the "launch.json" file, set the debugging environment and debugging port
• Run debugging, VS Code will automatically start the debugging session and reach the set point. A breakpoint

3. PhpStorm

PhpStorm is an IDE specifically designed for PHP development and also has built-in debugging tools. PhpStorm's debugging function supports Xdebug and Zend Debugger, which can perform breakpoint debugging, variable tracking, stack analysis, etc.

The specific steps are as follows:

• In PhpStorm settings, enable "Xdebug Remote Debug" or "Zend Debugger"
• Configure the debugging server and port
• Open the PHP file that needs to be debugged and set a breakpoint on the line number that needs to be debugged
• Start debugging. PhpStorm will automatically start the debugging session and reach the set breakpoint

Summary

In PHP programming, using debugging tools can greatly improve development efficiency and code quality. This article introduces common PHP debugging tools, including Xdebug, Visual Studio Code and PhpStorm. Use these tools to easily perform breakpoint debugging, variable tracing, stack analysis and other operations. Developers can choose tools that suit them according to their own needs to improve PHP development efficiency.

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