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Some contribution towards a specification of usort()
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- If you don't provide the callback function, an error would be raised: "usort(): Invalid comparison function."
- If your callback function doesn't return anything, or returns any value other than -1 or +1 (e.g. 0, 2, -2), then usort() would treat your sorting purpose as if there is no comparison operator provided, and it would actually change your list into an undefined order
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Server IP: 69.147.83.197
Probable Submitter: 80.113.160.213
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Manual Page -- http://www.php.net/manual/en/function.usort.php
Edit -- https://master.php.net/note/edit/102724
Del: integrated -- https://master.php.net/note/delete/102724/integrated
Del: useless -- https://master.php.net/note/delete/102724/useless
Del: bad code -- https://master.php.net/note/delete/102724/bad+code
Del: spam -- https://master.php.net/note/delete/102724/spam
Del: non-english -- https://master.php.net/note/delete/102724/non-english
Del: in docs -- https://master.php.net/note/delete/102724/in+docs
Del: other reasons-- https://master.php.net/note/delete/102724
Reject -- https://master.php.net/note/reject/102724
Search -- https://master.php.net/manage/user-notes.php