How to Determine if a PHP Array is Associative or Sequential

In PHP, arrays are flexible and can act as both indexed arrays (or “sequential” arrays) and associative arrays. However, PHP treats all arrays as associative by default. So, how can you differentiate between an associative array and a sequential array?

An associative array uses string keys, while a sequential array uses numeric keys starting from 0 and increasing sequentially. In this blog post, we’ll explore a few different ways to check whether a given array is associative or sequential, using practical examples and approaches that avoid expensive operations.

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