Update code with comments.

Author: glo21474

src/Command/Image/GeneratePhp.php

@@ -26,10 +26,9 @@
 class GeneratePhp extends Command
 {
     private const NAME = 'image:generate:php';
-    private const SUPPORTED_VERSIONS = ['7.4', '8.0', '8.1', '8.2', '8.3'];
+    private const SUPPORTED_VERSIONS = ['8.0', '8.1', '8.2', '8.3'];
 
     private const VERSION_MAP = [
-        '7.4' => '7.4',
         '8.0' => '8.0.14',
         '8.1' => '8.1.1',
         '8.2' => '8.2',