What is the underlying implementation principle of the in_array function in PHP?

In PHP, the in_array function is used to check if a certain value exists in an array by iterating through each element and comparing it with the target value. If a matching element is found, the function returns true; otherwise, it returns false.

The specific implementation principle is as follows:

1. Iterate through each element in the array and compare it with the target value one by one.
2. authentic
3. untrue

Since the in_array function uses a simple linear search algorithm, it may be less efficient when searching in large arrays. To efficiently search for a value in an array, consider using the array_search function or converting the array into a hash table or another data structure to improve search efficiency.