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There is a https://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_buildForm manual page, but not sure I've got it right.

Say, there is a value in a custom function, which should be set as default in a form, built using hook_buildForm (where form itself opens in a modal frame and outside civicrm/ path).

I've a suspicions CRM_Utils_Array::value might be used to set a custom variable somewhere (anywhere) and get it later on wherever it might be needed;

Have an attempt to set value outside of hook_buildForm like this:

$myVeryOwnPid = CRM_Utils_Array::value('myveryownpid', $contact['contact_id_b'], $contact['contact_id_b']); 

and get it from inside hook_buildForm:

  $myVeryOwnPid = CRM_Utils_Array::value('myveryownpid', $_GET, '0');

..but, of course, nothing works, just because I clearly don't understand, how it should work. As they say, CRM_Utils_Array is the most often used feature in CiviCRM, but digging inside a source code Ive realized there is no forest for the trees (at least, for me). Any advice, please!

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Found an answer here https://wiki.civicrm.org/confluence/display/CRMDOC/Update+custom+fields+in+contributions+and+events+by+passing+variables+in+a+URL

Nothing to do with CRM_Utils_Array though; just plain simple passing vars via an URL.

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