[pull] master from php:master - #1250
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…index (#23577) `array_keys()` reused the input array when it was empty. For an array that was previously populated, this preserved the next free index and caused later appends to start at a non-zero key, even though `array_keys()` returns a list. Return a fresh empty array, matching `array_values()`, and cover both previously populated and fresh empty arrays across all argument forms. Closes #23577
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