The array_intersect_assoc() function compares the keys and values of two (or more) arrays, and returns the matches. This function compares the keys and values of two or more arrays, and return an array that contains the entries from array1 that are present in array2, array3, etc.
The array_intersect_assoc() is used to create an array containing keys and values of the first array whose values (i.e. from the first array) are present in all other arrays, while index of values is same for all the given arrays.