[PHP-NOTES] note 130272 added to function.array-column

I didn't see this explicitly mentioned in the documentation but if an array value is not an array (or an object with the correct functions for access) or the column_key doesn't exist then that value will simply not have a corresponding value in the output

so array_column([[4,5,6], [7,8,9], 10], 0) will return [4,7].  It also means that the suggestion of 

array_combine(array_keys($array), array_column($array, 'column'));

to preserve keys isn't safe unless you verify that nothing will be excluded by the array_column call.
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