Deprecation errors are not suppressed anymore (#3102)

README.md

@@ -179,6 +179,8 @@ Most important changes will be listed here, all other changes since `19.4.0` can
 - search for "NULL" in backend grids ([#1203](https://github.com/OpenMage/magento-lts/pull/1203))
 - removed `lib/flex` containing unused ActionScript "file uploader" files ([#2271](https://github.com/OpenMage/magento-lts/pull/2271))
 - Mage_Catalog_Model_Resource_Abstract::getAttributeRawValue() now returns `'0'` instead of `false` if the value stored in the database is `0` ([#572](https://github.com/OpenMage/magento-lts/pull/572))
+- PHP extension `intl` is required
+- Deprecation errors are not suppressed anymore
 - removed modules:
   - `Mage_Backup` ([#2811](https://github.com/OpenMage/magento-lts/pull/2811))
   - `Mage_Compiler`
@@ -192,10 +194,6 @@ _If you rely on those modules you can reinstall them with composer:_
 - `Mage_PageCache`: `composer require openmage/module-mage-pagecache`
 - `Legacy frontend themes`: `composer require openmage/legacy-frontend-themes`
 
-### Between OpenMage 19.4.18 / 20.0.16 and 19.4.19 / 20.0.17
-
-- PHP extension `intl` is required
-
 ### Between OpenMage 19.x and 20.x
 
 Do not use 20.x.x if you need IE support.
@@ -305,13 +303,7 @@ grep -rn 'urn:Magento' --include \*.xml
 - Open your site in browser
   ```bash
   ddev launch
-  ```
-
-## Development with PHP 8.1+
-
-Deprecation errors are supressed by default.
-
-If you want to work on PHP 8.1+ support, set environment variable `DEV_PHP_STRICT` to `1`, to show all errors.  
+  ``` 
 
 ## PhpStorm Factory Helper
 

app/code/core/Mage/Core/functions.php

@@ -123,15 +123,6 @@ function mageCoreErrorHandler($errno, $errstr, $errfile, $errline)
         return false;
     }
 
-    // Suppress deprecation warnings on PHP 7.x
-    // set environment variable DEV_PHP_STRICT to 1 will show E_DEPRECATED errors
-    if ((!isset($_ENV['DEV_PHP_STRICT']) || $_ENV['DEV_PHP_STRICT'] != '1')
-        && $errno == E_DEPRECATED
-        && version_compare(PHP_VERSION, '7.0.0', '>=')
-    ) {
-        return true;
-    }
-
     // PEAR specific message handling
     if (stripos($errfile . $errstr, 'pear') !== false) {
         // ignore strict and deprecated notices