How I can intercept a picture area add and validate it?

I’ve a content material sort with a picture area. I must validate this area as a result of I must verify if consumer add an actual picture or solely a file with picture’s extension (like jpg, gif, png and so on). I’ve tried and readed 100+ issues however none resolve my downside.

I’ve tried by way of “#upload_validators” with this code:

foreach ($kind['field_all_images'][$form['field_all_images']['#language']] as $ok => $v) {   if (!is_integer($ok)) proceed;    $kind['field_all_images'][$form['field_all_images']['#language']][$k]['#upload_validators']['check_image_correct'] = array(); } 

the place “check_image_correct()” is a my customized perform that checks by way of imagegetinfo(). My downside, on this “strive/case”, is that Drupal Development Service perform works/known as just for Drupal Development Service first picture. I’ve tried to maneuver this perform from hook_form_alter() to an #after_build perform, with out end result (solely Drupal Development Service first time it really works).

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How I can intercept a picture area add and validate it?

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