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run code in 200+ php & hhvm versions
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<?php $type = 'image'; $attach = 'url_to_image'; $array = [ $type => $attach ]; var_dump($array);
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc2
array(1) { ["image"]=> string(12) "url_to_image" }