Our today’s topic is how associative arrays are implemented in PHP. Let’s discuss over it…. Basic Arrays in C Let’s take an example of basic array in C where index or key is always an integer. It can’t be string. All the arrays start from index 0 and ends at index (n-1), where n is the number of elements in array. All the elements are stored in continuous memory locations. For example first element at memory location 0 and 10 th element on 9th location. This is the basic array of C. What is Hashtable? A hash table or hash map is a data structure that uses a hash function to map identifying values, known as keys (e.g., a person's name), to their associated values (e.g., their telephone number). Thus, a hash table implements an associative array. We will go into detail of this in next few minutes.. What is Hash Function? The hash function is used to transform the key into the index (the hash) of an array element (the s...