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$locations = array('location1');
$locations += array('location2', 'location3', 'location4');
to save the hassle of doing one $locations[] = 'location1'; for each location.
But += doesn't add any entry if the key of the new array already exists in the original array. So, using my example, the resulting array would be:
$locations: array('location1', 'location3', 'location4');