what is the format or encoding of files in the content property when creating an attachment entity in civicrm API V3

Question

I tried many things like base 64 or just using the php function file_get_contents but when i check the civicrm UI and click on the attachment it doesn't work (for images for example it says unrecognized format). So what is the proper way to use the content property in the create action in the API V3

Answer 1

There's a unit test at https://github.com/civicrm/civicrm-core/blob/3a822c76c86397199c53f750e71081d548f45a96/tests/phpunit/api/v3/AttachmentTest.php#L93-L100 and https://github.com/civicrm/civicrm-core/blob/3a822c76c86397199c53f750e71081d548f45a96/tests/phpunit/api/v3/AttachmentTest.php#L316-L319 that together describe how to use this. Putting them together it would be:

civicrm_api3('Attachment', 'create', [
  'entity_table' => 'civicrm_activity',
  'entity_id' => $activityId,
  'name' => 'example.png',
  'mime_type' => 'image/png',
  'description' => 'My test description',
  'options' => [
    'move-file' => 'temporary/path/to/example.png',
  ],
]);