This test playbook used to work in ansible 1.9.x and is no longer working. 
I have no variables (foo or  php_packages)defined for this example.

---
- debug: msg "Foo is " {{ foo }}
  when: foo is defined

- debug: msg "Foo is " {{ foo }}
  when: php_packages is defined

- name: Install generic php
  yum: name={{ item }} enablerepo=epel state=present
  with_items:
    - php
  when: php_packages is not defined

- name: Install php and packages from php_packages
  yum: name={{ item }} enablerepo=epel state=present
  with_items: [ '{{ php_packages }}' ]
  when: php_packages is defined


I am getting 

PLAY [configure and deploy the webservers and application code] 
****************

TASK [setup] 
*******************************************************************
ok: [localhost]

TASK [test : debug] 
************************************************************
skipping: [localhost]

TASK [test : debug] 
************************************************************
skipping: [localhost]

TASK [test : Install generic php] 
**********************************************
ok: [localhost] => (item=[u'php'])

TASK [test : Install php and packages from php_packages] 
***********************
fatal: [localhost]: FAILED! => {"failed": true, "msg": "ERROR! 
'php_packages' is undefined"}

PLAY RECAP 
*********************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=1


The debug steps acts correctly so I assume the when clause is working as 
expected. 

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