Tracy VS xDebug

are you logging all errors/warnings and notices in php? and if so , are any coming up? maybe it would be worth adding tracy to your project to display issues? (https://tracy.nette.org)

You may have already used some of Nette's tools in other projects you've worked on and not known it! There is the very extendable Tracy for debugging similar to Whoosh, and Latte for intuitive HTML templating.

Is a Docker WordPress Environment focused on the development of WordPress plugins and themes, supports WP-CLI, phpMyAdmin, Xdebug and WordPress Coding Standards - WPCS.

I've gotten a lot of mileage out of Psalm, a static analysis tool that can help you identify potential bugs and things that might not be considered best practice, and XDebug, a debugging and profiling extension for PHP.

Step debugger

XDebug

Xdebug, per the official website, “is an extension for PHP, and provides a range of features to improve the PHP development experience”.

or var-dump() but what you probably want is a step debugger like XDebug.

There's FirePHP (I've never used it) but the most straightforward way to inspect variables is Xdebug (supported by PhpStorm, Visual Studio Code and NetBeans).

Before the introduction of debuggers like XDebug and ZendDebugger, developers were forced to spend excessive time understanding the root cause of an application’s misbehavior.

Using Xdebug's profiling features. This takes some time to learn and setting up to your environment.

Setup PHP with XDebug: This section installs PHP with XDebug, which is a PHP extension that is critical to generating the coverage report file labeled "coverage.xml". For projects written in other programming languages, this section of the CI pipeline is usually where necessary setup for running the unit tests is done.