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$Stack->contains()

$obj = $stack->contains($field,$value);

Searches all the objects in the stack and returns the first object where $field = $value. If no object is found, returns null.

This is commonly used to look for image attachements:

if ($img = $content->files()->contains('file_name','img')) { 
// do something with $img
} else {
// no image!
} 
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