[FIXED] How do I force CakePHP 3 and CakePHP 4 to show the deprecation warnings / notices?

Issue

What I did

• Purposefully put $this->primaryKey('id') in my Table class
• Call ->find('all')->all() on that Table inside Controller

What I expected

A deprecation notice at the top of my screen since primaryKey() is deprecated.

What actually happened

Everything worked with no errors shown

What have I checked

• display_errors is On in phpinfo()
• error_reporting is 32767 a.k.a. E_ALL in phpinfo()
• $this->TESTprimaryKey('id') raises BadMethodCallException Unknown method "TESTprimaryKey", meaning it's the right Table
• Error.errorLevel set to E_ALL in my app.php
• php composer.phar upgrade and php composer.phar update just in case
• VERSION.txt shows 3.6.10. All of this is also true for 4.2.4.

Solution

This looks all good, E_ALL includes deprecations, and as long as debug is enabled in your app configuration, deprecation warnings will be shown (irrespectively of PHPs display_errors setting).

If you are using Debug Kit, deprecation warnings will be intercepted by it, and they can be found in the Deprecations panel.

Answered By - ndm