PHP Function Array_Intersect_Key

The php function array_intersect_key compares keys of two or more arrays against each other and returns only the matching values. It is similar to the php function array_intersect(), but in this case only the values are compared. The key => value pairs are considered equal only if the string representation of the values match.

This is an excellent function to use when comparing multiple arrays in a loop, for example in an online cart application or even for checking if data exists in a database. It is a fast, efficient and powerful function that can be used in a variety of real-world scenarios.

Array_intersect_key is a function that works by comparing array keys using a custom comparison function. It is different from a php function array_diff_key which compares array values.

A php program that utilizes array_intersect_key can check for an intersection between various arrays by passing in an array of arrays along with a custom ukey_intersectFunction to compare against each other. This particular ukey_intersectFunction compares the keys of an array to other arrays using a sorted list of key => value pairs.

This enables you to create an associative array that only contains the results against other arrays with the same key. It can be used against multiple arrays or an array against itself, as well as the key => value pair being sorted by either key or values. It is also very easy to customize, for example to compare against a sorted list of key or values, or even by adding more arrays to the list.