Allow to exclude roles from plays with --exclude-roles command line parameter

tasks/main.yml

@@ -5,9 +5,12 @@
 ---
 # file: roles/php/tasks/main.yml
 
-- include: php.yml
-  when: role_php_completed is not defined
+- block:
+  - include: php.yml
+    when: role_php_completed is not defined
 
-- name: 'PHP | Remember that this role had been run'
-  set_fact: role_php_completed=true
-  when: role_php_completed is not defined
+  - name: 'PHP | Remember that this role had been run'
+    set_fact: role_php_completed=true
+    when: role_php_completed is not defined
+
+  when: '"php" not in excluded_roles'