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Re: [bang-phpug] PHP While Loop Question, please answer

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  • Koushik G raj
    Hi Trinadh, try this. while(($a[$i] !=
    Message 1 of 7 , Dec 28, 2008
      Hi Trinadh,

      try this.
      while(($a[$i] !="<" || $a[$i+1]!="a") && $i<$l)

      --- On Sun, 28/12/08, thisistrinath <thisistrinath@...> wrote:
      From: thisistrinath <thisistrinath@...>
      Subject: [bang-phpug] PHP While Loop Question, please answer
      To: bang-phpug@yahoogroups.com
      Date: Sunday, 28 December, 2008, 12:08 PM











      Hello,

      It seems odd to ask a question on while loop but the problem

      itself is equally odd.

      $a="<html><head> </head><body> <a href=";//a string

      $l=strlen($a) ;

      $i=0;

      while($a[$i] !="<" && $a[$i+1]!="a" && $i<$l){$i++; }

      echo $i;

      A simple thing as this should give me the output 25, whereas it is

      giving me 9. Please tell me where is the problem or is that the PHP

      while loop cannot check more than two conditions at a time(as here are 3).

      Thank you

      -Trinadh



























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    • Lokesh M
      There is nothing odd, Just notice where the first a is then everything becomes clear and logical. As per the condition used it fails for $a[$i+1]!= a at
      Message 2 of 7 , Dec 28, 2008
        There is nothing odd, Just notice where the first "a" is then everything becomes clear and logical.

        As per the condition used it fails for $a[$i+1]!="a" at "<html><hea"
        which is obviously the 10th char
        The condition is true only for first 9 characters











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      • janakiraman
        Hi thisistrinath, Otherwise use like this and check it out..
        Message 3 of 7 , Dec 29, 2008
          Hi thisistrinath,
          Otherwise use like this and check it out..
          <?php

          $a="<html><head></head><body><a href=";//a string
          $l=strlen($a) ;
          $i=0;
          while($i<$l){
          if($a[$i] =="<" && $a[$i+1]=="a" && $i<$l)
          break;
          $i++;
          }
          echo $i;
          ?>

          Thanks

          B. Janakiraman

          --- On Mon, 29/12/08, Udayakumar Sarangapani <udayakumar.sarangapani@...> wrote:
          From: Udayakumar Sarangapani <udayakumar.sarangapani@...>
          Subject: Re: [bang-phpug] PHP While Loop Question, please answer
          To: bang-phpug@yahoogroups.com
          Date: Monday, 29 December, 2008, 1:03 PM











          Hi Srikanth,



          When i debugged and ran your code, i got 0 as the output. I don't know the

          reason.



          why don't you change the logic as follows?



          <?php

          $a="<html><head> </head><body> <a href=";//a string

          $l=strlen($a) ;

          $j = -1;



          for($i=0; $i < $l; $i++) {

          if ($a[$i] == "<" && $a[$i+1] == "a") {

          $j = $i;

          }

          }



          if ($j != -1) {

          echo $j;

          }

          ?>



          On Sun, Dec 28, 2008 at 12:08 PM, thisistrinath

          <thisistrinath@ yahoo.co. in>wrote:



          > Hello,

          > It seems odd to ask a question on while loop but the problem

          > itself is equally odd.

          > $a="<html><head> </head><body> <a href=";//a string

          > $l=strlen($a) ;

          > $i=0;

          > while($a[$i] !="<" && $a[$i+1]!="a" && $i<$l){$i++; }

          > echo $i;

          > A simple thing as this should give me the output 25, whereas it is

          > giving me 9. Please tell me where is the problem or is that the PHP

          > while loop cannot check more than two conditions at a time(as here are 3)..

          > Thank you

          > -Trinadh

          >

          >

          >



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        • thisistrinath
          Hello friends, Thank you for replying me, I was trying to build a URL extractor. But since I couldn t get the while loop right I moved to for and if loop
          Message 4 of 7 , Dec 30, 2008
            Hello friends, Thank you for replying me, I was trying to build a URL
            extractor. But since I couldn't get the while loop right I moved to
            for and if loop system. I will finish the code and show to you people
            so you can run and see.
            Thank you
            Trinadh Yerra
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