* PHP-5.5:
NEWS for array_column
array_column: Fix compile-time warnings
array_column: Removed array_pluck() alias
array_column: Set array_pluck as an alias for array_column
array_column: Implement ability to specify an index column
Cleaning up a memory leak.
array_column: Adding test for IS_OBJECT and converting object to string
array_column: Using add_next_index_zval() at nikic's recommendation.
array_column: Improved tests
array_column: Cleaning up, as recommended in pull request #56 comments
Fixing typo in test for array_column()
Simplify the code and use zend_hash_next_index_insert()
Adding test for columns not present in all rows for array_column().
Adding tests for the negative results of array_column()
Implement new array function array_column()
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