[pull] master from php:master #253
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…auses assertion failure Having an empty result array is not a problem, because zend_hash_extend() will initialize it. Except it does not when the number of elements to add equals 0, which leaves the array uninitialized and therefore does not set the packed flag, causing the assertion failure. Technically, removing the assert would also work and save a check. On the other hand, this check could also prevent some real work to be done and should be relatively cheap as we already have to compute the sum anyway. Closes GH-19318.
* PHP-8.3: Fix GH-19303: Unpacking empty packed array into uninitialized array causes assertion failure
* PHP-8.4: Fix GH-19303: Unpacking empty packed array into uninitialized array causes assertion failure
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