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ravi
answered Apr 26 '23 00:00
In PHP, associative arrays are implemented as hash tables, which means that the elements are not stored in a sequential manner. Instead, each element is stored at a position that is determined by its hash value.
When a new element is added to an associative array, PHP calculates a hash value for the key of the element using a hash function. The hash value is then used as an index into an internal hash table, where the element is stored. If there is already an element at that position in the hash table (i.e., a hash collision occurs), PHP uses a technique called chaining to resolve the collision. In chaining, multiple elements that have the same hash value are stored in a linked list at the corresponding position in the hash table.
When you access an element in an associative array using its key, PHP calculates the hash value for the key and uses it to look up the element in the hash table. If there are no collisions, PHP can immediately retrieve the element from the hash table. If there are collisions, PHP follows the linked list to find the element with the matching key.
Since the hash function used by PHP is deterministic, the order of the elements in an associative array is not guaranteed to be the same as the order in which they were added. If you need to preserve the order of the elements, you should use an indexed array instead of an associative array.
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