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You can effectively debug PHP code by enabling error reporting, using var_dump() and print_r() to display variables, setting breakpoints (such as using Xdebug), recording debugging information, installing PHP debugging tools, and using a log management system. .
The Art of PHP Debugging
Debugging is a critical part of the software development process, it helps to find and fix errors in your code The problem. For PHP developers, mastering debugging skills is crucial and can significantly speed up the development process.
Zero Basic Debugging Guide
1. Enable error reporting
By default, PHP will suppress certain errors and warn. To get as much information as possible, enable error reporting:
ini_set('display_errors', 1); error_reporting(E_ALL);
2. Use var_dump() and print_r()
These functions can be used to display the contents of variables . They are very useful in debugging to quickly see the value and type of a variable:
var_dump($variable); print_r($array);
3. Set breakpoints
Xdebug is a PHP extension that allows you to set Breakpoints and pause execution at specific lines of code. This allows you to step through code and examine the values of variables.
How to install and use Xdebug is beyond the scope of this article, but you can check out the official documentation for more information.
Practical case
Consider the following code snippet:
function sum($a, $b) { return $a + $b; } $result = sum(5, 10);
Suppose the function returns the wrong result. The following debugging steps will help you find the problem:
var_dump($a); var_dump($b);
Advanced Debugging Tips
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