How to remove a key and its value from an associative array in php?

Using unset() function: The unset() function is used to unset a key and its value in an associative array in php.

Difference between indexed array and associative array in php?

An array is a collection of objects that contain a group of variables stored under the same name. All the elements belong to the same data type, i.e. string, integers, or lists. Keys are unique in the case of both indexed and associative arrays.