How to debug PHP functions with Xdebug?

The steps to use Xdebug to debug PHP functions are as follows: Install the Xdebug extension and configure php.ini. Set a breakpoint (using the xdebug_break function or // @debugger annotation). Connect remotely to an IDE or debugger like PhpStorm, set breakpoints and step through your code. Inspect variable values ​​and find problems.

How to use Xdebug to debug PHP functions?

Xdebug is a PHP extension that allows you to debug PHP scripts. It provides a rich set of functions, including setting breakpoints, inspecting variables, tracing function calls, etc.

Install Xdebug

Execute the following command in the command line to install the Xdebug extension through PECL:

pecl install xdebug

Then, edit your php.ini file , add the following configuration:

zend_extension=xdebug.so
xdebug.remote_enable=1
xdebug.remote_host=localhost
xdebug.remote_port=9000

Set breakpoint

To set a breakpoint, you can use the xdebug_break function before the line of code you want to debug:

xdebug_break();

// 代码逻辑

Alternatively, you can use // @debugger above the code. Note:

// @debugger

// 代码逻辑

Remote debugging

Once Xdebug is installed Once configured, you can use an IDE or debugger (such as PhpStorm or Visual Studio Code) to remotely debug PHP scripts.

Practical Case

The following is a practical case showing how to use Xdebug to debug PHP functions:

<?php
function sum($a, $b) {
    return $a + $b;
}

// 设置断点
xdebug_break();

// 调用函数
$result = sum(1, 2);

echo $result;

In the IDE or debugger, you can Connect to the port Xdebug is listening on (usually 9000), then set breakpoints and step through the code, checking variable values ​​and looking for problems.

Tips

• Make sure the Xdebug extension is turned on (php -m | grep xdebug).
• If you have trouble, check out the Xdebug documentation or help on Stack Overflow.
• Xdebug provides more debugging features such as code coverage and performance analysis.

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