> -----Original Message----- > From: Joshua Kehn [mailto:josh.kehn@xxxxxxxxx] > Sent: 23 May 2011 13:04 > > On May 23, 2011, at 8:00 AM, tedd wrote: > > > At 8:13 AM +0000 5/23/11, Ford, Mike wrote: > >> echo strcmp('These are nearly equal', 'These are almost > equal'), "\n"; > >> echo strcmp('different', 'unequal'), "\n"; > >> echo strcmp('b', 'a'), "<br />\n"; > >> > >> Result: > >> > >> 13 > >> -17 > >> 1 > >> > >> The description of the function merely says that the result is > <0, 0 or >0 > >> -- it makes no promises about the actual value when it is non- > zero. > >> > >> Mike > > > > Mike: > > > > That's interesting. Try the same comparisons here: > > > > http://www.webbytedd.com/lcc/citw229/string-compare.php > > > > For me they are 1, -1, and 1. > > > > Someone with more smarts than me* will have to figure this one > out. > > > > Cheers, > > > > tedd > > > > PS: * I can hear the peanut gallery saying "That won't be hard." > :-) > > > > -- > > ------- > > http://sperling.com/ > > Might that have something to do with the version of PHP running? Possibly -- or even the result returned by the underlying C strcmp() for any given architecture/compiler combination, which would like as not be even more variable. I think the lesson is, if writing portable code, always allow for results which might be outside of the [-1, 0, 1] set. (Incidentally, tedd, your test script has the < > signs the wrong way round in the output; plus which they should be < > anyway; plus plus which, you are not applying htmlspecialchars() or whatever to your echoed user input, so values such as "><!--" break your page, and I'm sure something more malicious could be cooked up were I so inclined... :( .) Cheers! Mike -- Mike Ford, Electronic Information Developer, Libraries and Learning Innovation, Leeds Metropolitan University, C507 City Campus, Portland Way, LEEDS, LS1 3HE, United Kingdom Email: m.ford@xxxxxxxxxxxxxx Tel: +44 113 812 4730 To view the terms under which this email is distributed, please go to http://disclaimer.leedsmet.ac.uk/email.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
