note 121044 added to function.strnatcmp

This function has some interesting behaviour on strings consisting of mixed numbers and letters. One may expect that such a mixed string would be treated as alpha-numeric, but that is not true. var_dump(strnatcmp('23','123')); → int(-1) As expected, 23<123 (even though first digit is higher, overall number is smaller) var_dump(strnatcmp('yz','xyz')); → int(1) As expected, yz>xyz (string comparison, irregardless of string length) var_dump(strnatcmp('2x','12y')); → int(-1) Remarkable, 2x<12y (does a numeric comparison) var_dump(strnatcmp('20x','12y')); int(1) Remarkable, 20x>12y (does a numeric comparison) It seems to be splitting what is being compared into runs of numbers and letters, and then comparing each run in isolation, until it has an ordering difference. ---- Server IP: 72.52.91.14 Probable Submitter: 86.3.44.227 ---- Manual Page -- http://php.net/manual/en/function.strnatcmp.php Edit -- https://master.php.net/note/edit/121044 Del: integrated -- https://master.php.net/note/delete/121044/integrated Del: useless -- https://master.php.net/note/delete/121044/useless Del: bad code -- https://master.php.net/note/delete/121044/bad+code Del: spam -- https://master.php.net/note/delete/121044/spam Del: non-english -- https://master.php.net/note/delete/121044/non-english Del: in docs -- https://master.php.net/note/delete/121044/in+docs Del: other reasons-- https://master.php.net/note/delete/121044 Reject -- https://master.php.net/note/reject/121044 Search -- https://master.php.net/manage/user-notes.php