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How to filter array by key in PHP

PHP array_intersect_key() work gives back a cluster containing every one of the passages of essential exhibit which have keys that are preset in every one of the contentions. This capacity registers the convergence of clusters utilizing keys for correlation. Here we will give a short PHP code bits to channel components of a cluster that contain a particular key. It will help you to channel an exhibit in view of specific key.

The following example code will filter the elements of an array by key using array_intersect_key() and array_flip() functions in PHP.

Function to Filter a PHP Array By Key

As I mentioned above array_intersect_key computes the intersection of arrays using keys, so in order to take advantage of this behavior we are converting second array values into keys and keys into values using array_flip.

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