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<?php $array = [ 'documents' => ['application/pdf','application/x-pdf'], 'images' => ['image/cgm','image/g3fax'], 'videos' => ['video/dl','video/fli','video/gl','video/mpeg'], ]; $find = 'image/g3fax'; var_export( array_find_key( $array, fn($row) => in_array($find, $row) ) );
Output for git.master_jit, git.master
'images'

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