Most of the time, getting the right answer is a matter of asking the right question. If most experienced people can't ask a fairly simple question, then maybe the question is to blame. That bit about the "computer science point of view" may be a little bit vague. Asking for implementation specifics may be more appropriate. I do know that arrays in PHP are implemented as hash tables as this is a common rant about it. But from your question I did not understand what you mean.
I'm still curious what do you mean by "ordered" because the PHP arrays don't order their keys. The common rant previously mentioned aka having to use asort() for getting a proper array:
Most hash tables have a semi-random order dictated by the hash algorithm in combination with the bucket count. PHP Arrays are ordered by insertion order (each slot in the hash table has a next pointer, the last of which is appended to on insertion).
The order may be unusual or even non-obvious, but it is predictable.
"Ordered" means "having order", not "having order that I wanted it to have". The order, unless you have sorted it, is the order of creation of elements. Which may not be what you want if you want numeric key order and you insert keys in different order. So what it means is that PHP array/hash structure supports the concept of order - so you can ask questions like "what is the first element? what is the next one?" Not for all hash structures this is true - for many hashes, asking "what is the next element after this one" is meaningless since there's no order defined on elements.
I got it now. The issue is the language barrier. And by language I mean my native language where "ordered" is sometimes used as synonym for "sorted" (at least in CS and Math fields), hence the confusion.
I'm still curious what do you mean by "ordered" because the PHP arrays don't order their keys. The common rant previously mentioned aka having to use asort() for getting a proper array: