Debug the VSCode + Docker + PHP development environment with XDebug.


The project I was working on was a PHP application using Laravel, created by VS Code. I'm used to working with Java and Swift, but it's a reminder that I've been so addicted to PHP debugging for the first time in a while.

What i did

Since XDebug is used for debugging PHP, I read XDebug commentary article and read it (it is a very easy-to-understand article).

Many articles explain it carefully, so I will wrap up the details.





FROM php:7.4-apache

# XDebug
RUN pecl install xdebug \
  && docker-php-ext-enable xdebug



  "version": "0.2.0",
  "configurations": [
      "name": "Listen for XDebug",
      "type": "php",
      "request": "launch",
      "port": 9000,
      "log": true,
      "pathMappings": {
        "/var/www/html": "${workspaceFolder}/src"
      "ignore": [

With this feeling, I finished PHP initialization, Docker initialization, and XCode debug settings.

__ This doesn't work at all. __


I messed with various parameters, but it didn't work at all and I gave up, but eventually I realized that it was a problem with the version of xdebug.

$ php -v | grep -i "xdebug"
    with Xdebug v3.0.2, Copyright (c) 2002-2021, by Derick Rethans

From Xdebug 2.x to 3.x, the __ setting value has changed. __ It is described in detail and clearly in this document.

For example, xdebug.remote_log has been renamed to xdebug.log. No wonder, the log doesn't come out at all.

If you look at the detailed meaning there, the above php.ini is now correct.




That's all from the field.

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