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$contactId = CRM_Utils_Request::retrieve('cid', 'Positive');
$contactId = (int) $_GET['cid'];
$contactId = $form->getVar('_contactID');

Are all possible solutions at different places, but none seem to work when in a Form_CustomData.

In this case the cust data is in an Activity for a civiCase

For the avoidance of doubt, this is to get the ID for the contact (not the user)

Edit: additional info.

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  • Use any debugging technique to examine the $form variable at the point in the code where you want to use it, and see what's available. e.g. CRM_Core_Error::debug_log_message(print_r($form, true)); to write to ConfigAndLog.
    – Demerit
    Commented Nov 28, 2019 at 3:09
  • Um, well yes. What I'm getting at is there does not appear to be anything which actually includes the cid.
    – Simon Walden
    Commented Nov 28, 2019 at 8:13

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Can you explain a little more what you are after in what circumstances?

Generally speaking: when in a form Custom Data I would expect to see something like entityId or _entityID. Depending on the defintion of the custom group this would be the contact_id (or membership or activity etc.)

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    edited to give more info, but In this case the cust data is in an Activity for a civiCase
    – Simon Walden
    Commented Nov 27, 2019 at 12:12
  • 2
    As Erik notes there is $form->_entityId, and then assuming you mean the "reported by"/"author" contact of the existing activity being edited, you can do $result = civicrm_api3('Activity', 'get', ['return' => ["source_contact_id"], 'id' => $form->_entityId,]); and then the contact id is in $result['values']['source_contact_id'].
    – Demerit
    Commented Nov 28, 2019 at 19:54
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    OK, so the contact ID is not present in the form as I suspected. Frustrating that the other forms of getting the contactID aren't maintained, but maybe there is a reason. For other readers, just to clarify: ErikH's comment only gets you the current entityID - so in other words an activityID if the current entity is an activity etc. It doesn't get you the contactID unless you are in a contact.
    – Simon Walden
    Commented Nov 29, 2019 at 8:32

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