A Problem in understanding PHP code

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  • Bsedigh_79@yahoo.com
    #1

    A Problem in understanding PHP code

    hi everybody.

    I'am a C# programmer and for one of my applications i searched web for
    a piece of code and finally i found it but in PHP.
    it was easy to understand the logic but i still have a problem with it.
    There is single line of code that i can't understand.Woul d u please
    help me and explain what is going on?

    Code :
    1)
    for ($i = 0; $g_day_no >= $g_days_in_mont h[$i] + ($i == 1 &&
    $leap); $i++)
    $g_day_no -= $g_days_in_mont h[$i] + ($i == 1 && $leap);

    $g_day_no >= $g_days_in_mont h[$i] + ($i == 1 && $leap) :-/

    2)
    what is div statement?
    There is a line of code like this:

    $gy += 4*div($g_day_no , 1461);

    what is div for?
    i searched in PHP functions but i did not find anything.

    Thanks for ur appreciates.
    Behzad

    Tags: None
    • Yttrium
      #2
      Re: A Problem in understanding PHP code


      <Bsedigh_79@yah oo.com> a écrit dans le message de news:
      1118830313.5683 03.260120@g43g2 00...legr oups.com...
      [color=blue]
      > what is div statement?
      > There is a line of code like this:
      >
      > $gy += 4*div($g_day_no , 1461);
      >
      > what is div for?
      > i searched in PHP functions but i did not find anything.[/color]


      Hi,
      Div is Probably a user function...
      Because in Php, there's nothing like this..

      Bye,


        Comment

        • Carramba
          #3
          Re: A Problem in understanding PHP code

          On Wed, 15 Jun 2005 12:11:53 +0200, <Bsedigh_79@yah oo.com> wrote:
          [color=blue]
          > hi everybody.
          >
          > I'am a C# programmer and for one of my applications i searched web for
          > a piece of code and finally i found it but in PHP.
          > it was easy to understand the logic but i still have a problem with it.
          > There is single line of code that i can't understand.Woul d u please
          > help me and explain what is going on?
          >
          > Code :
          > 1)
          > for ($i = 0; $g_day_no >= $g_days_in_mont h[$i] + ($i == 1 &&
          > $leap); $i++)[/color]

          its simple for loop...
          for //starting loop
          ($i = 0; //initiating count variable
          ($g_day_no) >= ( $g_days_in_mont h[$i] + ($i == 1 &&> $leap)); //just
          condition I addet () so maybe you se better
          can be more explained firts variable in condition $g_day_no
          if $g_day_no bigger or equal to ( $g_days_in_mont h[$i] + ($i == 1 &&>
          $leap))

          second variable in condition ( $g_days_in_mont h[$i] + ($i == 1 &&>
          $leap)), this one depends on i with will drow until the enequality returns
          true
          $i++) //grow by 1
          I'am guesing you forgot brakets? {}
          n that case the above code ll by executet while enequality is false
          [color=blue]
          > $g_day_no -= $g_days_in_mont h[$i] + ($i == 1 && $leap);
          >
          > $g_day_no >= $g_days_in_mont h[$i] + ($i == 1 && $leap) :-/[/color]


          [color=blue]
          > 2)
          > what is div statement?
          > There is a line of code like this:
          >
          > $gy += 4*div($g_day_no , 1461);
          >
          > what is div for?[/color]

          I think that is some local funktion, you should check for that

          [color=blue]
          > i searched in PHP functions but i did not find anything.
          > Thanks for ur appreciates.
          > Behzad
          >[/color]



          --

          Thanx in advance
          _______________ _________
          BTW. I know my english is not best in the word, so please stop bugging me
          about my spelling. And yes Iam sorry you don't understand what I mean, but
          there is no point to yell at me. Have a nice day.

            Comment

            • Daniel Tryba
              #4
              Re: A Problem in understanding PHP code

              Bsedigh_79@yaho o.com wrote:[color=blue]
              > $g_day_no >= $g_days_in_mont h[$i] + ($i == 1 && $leap) :-/[/color]

              Some implicit casting in action:
              i+true ==i+1
              i+false==i

                Comment

                • Jerry Stuckle
                  #5
                  Re: A Problem in understanding PHP code

                  Bsedigh_79@yaho o.com wrote:[color=blue]
                  > hi everybody.
                  >
                  > I'am a C# programmer and for one of my applications i searched web for
                  > a piece of code and finally i found it but in PHP.
                  > it was easy to understand the logic but i still have a problem with it.
                  > There is single line of code that i can't understand.Woul d u please
                  > help me and explain what is going on?
                  >
                  > Code :
                  > 1)
                  > for ($i = 0; $g_day_no >= $g_days_in_mont h[$i] + ($i == 1 &&
                  > $leap); $i++)
                  > $g_day_no -= $g_days_in_mont h[$i] + ($i == 1 && $leap);
                  >
                  > $g_day_no >= $g_days_in_mont h[$i] + ($i == 1 && $leap) :-/
                  >
                  > 2)
                  > what is div statement?
                  > There is a line of code like this:
                  >
                  > $gy += 4*div($g_day_no , 1461);
                  >
                  > what is div for?
                  > i searched in PHP functions but i did not find anything.
                  >
                  > Thanks for ur appreciates.
                  > Behzad
                  >[/color]

                  Behzad,

                  The code probably isn't commented as well as it could. However, my bust
                  guess:

                  1). $i is probably the month number (0-11 instead of 1-12). $leap would
                  be true or false, depending on if it's a leap year. If it is a leap
                  year ($leap == true) and February ($i == 1), then add 1 to the number of
                  days in the month ($g_days_in_mon th[$i]). It works because a "true"
                  value is converted to an int with the value of "1". False converted to
                  an int has the value "0".

                  2). I haven't seen it - I suspect's a user-defined function. I have no
                  idea what it does, other than there are 1461 days every 4 years (with 3
                  exceptions every 400 years...). So perhaps it returns an integer value
                  of the results of the division. This would tell how many 4-year blocks
                  there are, Multiply by 4 to get the number of years.

                  --
                  =============== ===
                  Remove the "x" from my email address
                  Jerry Stuckle
                  JDS Computer Training Corp.
                  jstucklex@attgl obal.net
                  =============== ===

                    Comment

                    • Geoff Berrow
                      #6
                      Re: A Problem in understanding PHP code

                      I noticed that Message-ID: <vdmdncO0zrpNlS 3fRVn-uA@comcast.com> from
                      Jerry Stuckle contained the following:
                      [color=blue]
                      >
                      >2). I haven't seen it - I suspect's a user-defined function. I have no
                      >idea what it does, other than there are 1461 days every 4 years (with 3
                      >exceptions every 400 years...). So perhaps it returns an integer value
                      >of the results of the division. This would tell how many 4-year blocks
                      >there are, Multiply by 4 to get the number of years.[/color]

                      Am I alone in thinking that this is possibly trying to reinvent existing
                      PHP date manipulation functions?

                      --
                      Geoff Berrow (put thecat out to email)
                      It's only Usenet, no one dies.
                      My opinions, not the committee's, mine.
                      Simple RFDs http://www.ckdog.co.uk/rfdmaker/

                        Comment

                        • Jerry Stuckle
                          #7
                          Re: A Problem in understanding PHP code

                          Geoff Berrow wrote:[color=blue]
                          > I noticed that Message-ID: <vdmdncO0zrpNlS 3fRVn-uA@comcast.com> from
                          > Jerry Stuckle contained the following:
                          >
                          >[color=green]
                          >>2). I haven't seen it - I suspect's a user-defined function. I have no
                          >>idea what it does, other than there are 1461 days every 4 years (with 3
                          >>exceptions every 400 years...). So perhaps it returns an integer value
                          >>of the results of the division. This would tell how many 4-year blocks
                          >>there are, Multiply by 4 to get the number of years.[/color]
                          >
                          >
                          > Am I alone in thinking that this is possibly trying to reinvent existing
                          > PHP date manipulation functions?
                          >[/color]

                          Hi, Geoff,

                          No, you're not alone :-)

                          --
                          =============== ===
                          Remove the "x" from my email address
                          Jerry Stuckle
                          JDS Computer Training Corp.
                          jstucklex@attgl obal.net
                          =============== ===

                            Comment

                            • Bsedigh_79@yahoo.com
                              #8
                              Re: A Problem in understanding PHP code

                              hi everybody

                              thanks for your repleis.
                              To see compelet code follow the this problem:

                              http://www.iranphp.net/modules/sections/index.php?op=viewarticle&artid=19


                                Comment

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