It returns all the keys in a new array; this will be an indexed array. If you use $search_value in the parameters, it will return an array that contains a subset of keys with that value.

The array_column function in PHP returns the values corresponding to a specified column from the provided array. array_column(array $array, int|string|null $column_key, int|string|null $index_key = null): array $acolumn = array_column($array,$column_key,$index_key); $acolumn = array_column($array,$column_key) Parameters $array – The array from which we will obtain our column. $column_key – The column from which we will retrieve the data. […]

Creates a new array by combining two given arrays, where the values of the first array become the keys of the new array, and the values of the second array become the values of this new array.

Removes duplicate values from the array and returns a new array without duplicates.

This PHP function will return all the values of the array in an indexed array.