Re: RES: [PHP] inexplicable behaviour SOLVED

Ford, Mike wrote: > On 26 April 2009 22:59, PJ advised: > > >> kranthi wrote: >> >>> if $Count1 is never referenced after this, then certainly this >>> assignment operation is redundent. but assignment is not the ONLY >>> operation of this statement. if u hav not noticed a post increment >>> operator has been used which will affect the value of $Count as well, >>> and this operation is required for the script to work. >>> >>> the script should work even if u replace >>> $Count1 = $Count++; >>> with >>> $Count++; >>> >>> Kranthi. >>> >>> >>> >> Not quite, since that would change the $Count variable and >> that is used >> leater in the code. >> > > Um -- I must be missing something here, because those two statements > have exactly the same effect on $Count, incrementing it by one (and you > said the first statement fixed your problem, so logically the second one > must too). > > In fact, because you've used a post-increment, the statement > > $Count1 = $Count++; > > ends up with $Count == $Count1+1, and $Count1 being the original value > of $Count!! > > This whole scenario smacks to me of a classic "off-by-one" error -- > either $Count actually *needs* to be one greater than the value you > first thought of, or some other value you are comparing it to should be > one smaller than it actually is. > > Cheers! > > Thanks for the clarification, Mike. In my ignorance, I was under the impression that the right side of the equation was only for the use of the left part. How stupid of me. So what I should have been doing was $Count1 = $Count + 1; right? Anyway, I don't need that statement anymore as I found the error of my ways and have corrected it. And behold, the light came forth and it worked. :-) > Mike > > -- > Mike Ford, Electronic Information Developer, > C507, Leeds Metropolitan University, Civic Quarter Campus, > Woodhouse Lane, LEEDS, LS1 3HE, United Kingdom > Email: m.ford@leedsmet.ac.uk > 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 > > -- Hervé Kempf: "Pour sauver la planète, sortez du capitalisme." ------------------------------------------------------------- Phil Jourdan --- pj@ptahhotep.com http://www.ptahhotep.com http://www.chiccantine.com/andypantry.php