php - usort changing Array's order -

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I have a user function with a line: return 0. I tried to use it on an array of stdClass objects, and it changes their order, how is this possible?

The property that you believe is named: A Stable sorting algorithm elements Will not change the sequence, which are similar.

The php sorting functions no are static (since the non-static type may be slightly faster). From:

If two members compare as equal, their order in the ordered array is undefined.

If you want a stable sorting algorithm, then you

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