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I’m using numeric keys that are part of my data, if I can count on the order as initialized my solution is easier, friendlier to read, and cleaner code!
Probably obvious but: Between array initialization and the foreach() outputting the data no other array functions will be touching the array.
PHP arrays are implemented as hashes. Even for numeric keys, the keys actually exist and values are associated with them, unlike lists or sets in other languages. You can count on the order to never change on its own, because that would mean actually changing the values associated with the (numeric) keys.