What tools or software can be used to troubleshoot PHP errors in a custom-built system?

When troubleshooting PHP errors in a custom-built system, tools like Xdebug, PHP_CodeSniffer, and PHPStan can be helpful. Xdebug provides debugging and profiling capabilities, PHP_CodeSniffer checks code against coding standards, and PHPStan performs static analysis to find errors. These tools can help identify and fix issues in PHP code efficiently.

// Example code snippet using Xdebug to debug PHP errors
// Enable Xdebug in php.ini file
// Set breakpoints in the code
// Use Xdebug-enabled IDE like PhpStorm to step through the code and identify errors