What is the purpose of php array_column?

The function array_column() retrieves a specified column from a multidimensional array.

It accepts three parameters.

1. array: a multi-dimensional array from which to retrieve the columns.
2. column_key: the key name or index of the column to be returned. It can be an integer representing the index or a string representing the key name.
3. index_key (optional): column to be used as the index/key for the returned array. If not provided, the array will use a zero-based index.

The array_column() function can be used to extract a single column from a database query result or from a specific column in a multi-dimensional associative array.