Programming Forums > Web Development and Design > PHP

kurifu · Jul 20th, 2004, 4:43 PM

Even from time to time I get thrown astray on a weird bug in which I am usually looking right at the problem, yet still can not figure out what is wrong.

This is my code:

(Toggle Plain Text)

<?
  $subject = "<td width=\"150\" background=\"images/bg_menu.gif\" bgcolor=\"#CCCCCC\">
  ##if: SESSION_SHOWPREFS##<div class='ptrten' onClick='change_pref(\"STRSEL\")'><INPUT ##if: STRSEL##CHECKED##fi: STRSEL## TYPE=RADIO NAME=sgw VALUE='str'> STRSEL</div>
  <div class='ptrten' onClick='change_pref(\"GAYSEL\")'><INPUT ##if: GAYSEL##CHECKED##fi: GAYSEL## TYPE=RADIO NAME=sgw VALUE='gay'> GAYSEL</div>
  <div class='ptrten' onClick='change_pref(\"ANYSEL\")'><INPUT ##if: ANYSEL##CHECKED##fi: ANYSEL## TYPE=RADIO NAME=sgw VALUE='any'> ALLSEL</div>##fi: SESSION_SHOWPREFS##
  ##if: SESSION_HIDEPREFS##<span class='ptrten' onClick='unhide()'>>>> Set Preferences</span>##fi: SESSION_HIDEPREFS##'
";

  #//now try to match the string...
  $match_string = '/##if:[\s]*SESSION_SHOWPREFS##(.+)##fi:[\s]*SESSION_SHOWPREFS##/U';
  $result = preg_match( $match_string, $subject, $captured );

  if( $result === 0 ) print "\nResult returned as 0";
  if( $result === false ) print "\nResult returned false";

  #//just out of curiosity..
  $it_is_false = false; $it_is_true = true;
  print "\nFALSE: $it_is_false, TRUE: $it_is_true\n";

  #//now the data...
  print_r( $capture ); print "\n";
?>

this is my output:

(Toggle Plain Text)

-bash-2.05b$ php -e preg_test.php

Result returned as 0
FALSE: , TRUE: 1

-bash-2.05b$

Perhaps someone can tell me what I am overlooking here... I am expected it to return 1, and match the following section within the subject:

(Toggle Plain Text)

##if: SESSION_SHOWPREFS##<div class='ptrten' onClick='change_pref(\"STRSEL\")'><INPUT ##if: STRSEL##CHECKED##fi: STRSEL## TYPE=RADIO NAME=sgw VALUE='str'> STRSEL</div>
  <div class='ptrten' onClick='change_pref(\"GAYSEL\")'><INPUT ##if: GAYSEL##CHECKED##fi: GAYSEL## TYPE=RADIO NAME=sgw VALUE='gay'> GAYSEL</div>
  <div class='ptrten' onClick='change_pref(\"ANYSEL\")'><INPUT ##if: ANYSEL##CHECKED##fi: ANYSEL## TYPE=RADIO NAME=sgw VALUE='any'> ALLSEL</div>##fi: SESSION_SHOWPREFS##

Any help would be appreciated, thanks in advance

kurifu · Jul 20th, 2004, 5:10 PM

Most interestingly enough if you use the following pattern to match it works fine...

(Toggle Plain Text)

$match_string = '/##if:[\s]*SESSION_SHOWPREFS##([^z]*)##fi:[\s]*SESSION_SHOWPREFS##/U';

It would seem that using (.+) is not matching something within the context of the subject... Any ideas?

kurifu · Jul 20th, 2004, 5:59 PM

Anyway, problem solved.. just used the following character class (I know it is redundant, but it fixed the problem)

(Toggle Plain Text)

[.\w\W\s\S]

Infinite Recursion · Jul 20th, 2004, 6:24 PM

Glad ya got it worked out....

A question: Why do these lines of code? Were you testing to see how the
booleans would appear?

(Toggle Plain Text)

 
$it_is_false = false; $it_is_true = true;
 print "\nFALSE: $it_is_false, TRUE: $it_is_true\n";

kurifu · Jul 20th, 2004, 11:32 PM

Yeah, I know that PHP generally tends to hold the following statements true:

'0' = 0 = "0" = flase and
'1' = n = "n" = true (for n = (0,oo])

And what I did to insure that there were no errors in my original source code is I stucka print statement infront of preg_match which resulted in a 0, I just wanted to make sure that PHP was not formatting my FALSE to a 0 before printing it out, so I threw that in there to check when I wrote that test script.

I still find the problem to illude me, according to the Perl Regexp guide, the character '.' should match *ANY* character, but for some reason it was refusing to match one of the viewable characters in the string I included in that script (posted above). The solution [.\w\W\s\S]* is not a nice one, but it does work.. however redundant it may actually be. I do not see this is posing as a performance hit however since '.' would have been evaluated much the same as the character class I provided.

Perhaps this is a bug in PHP4? Or perhaps I am just misinformed on the use of the '.' character class. In any case, the script I was debugging for the last two days is now much closer to being debugged, lol.

Infinite Recursion · Jul 21st, 2004, 7:55 AM

It seems to me that your initial RE should work... but I have not played with Perl REs in a while. As far as the performance degradation, I don't think there will be a noticeable difference, if any at all.

kurifu · Jul 22nd, 2004, 12:30 AM

I suppose the ultimate way to find out is to run the same regexp through a Perl system and see how that fairs... now the only thing is, that I do not like Perl enough to waste the time to do that... but then again if I get bored this weekend I will find out.

If it runs through perl I will send a bug report (after I check to see that one does not exist first) to the lovely people behind the scenes of PHP. I suspect bug moreso then anything else though... the purpose of that character class is to match EVERYTHING from every source I have read to date.

Infinite Recursion · Jul 22nd, 2004, 12:33 AM

Yup, that's what most documentation seems to read. Let me know how it turns out.

Jul 20th, 2004, 4:43 PM	#1
kurifu Expert Programmer Join Date: Jul 2004 Location: Halifax, Nova Scotia (Canada) Posts: 784 Rep Power: 5	Even from time to time I get thrown astray on a weird bug in which I am usually looking right at the problem, yet still can not figure out what is wrong. This is my code: (Toggle Plain Text) <? $subject = "<td width=\"150\" background=\"images/bg_menu.gif\" bgcolor=\"#CCCCCC\"> ##if: SESSION_SHOWPREFS##<div class='ptrten' onClick='change_pref(\"STRSEL\")'><INPUT ##if: STRSEL##CHECKED##fi: STRSEL## TYPE=RADIO NAME=sgw VALUE='str'> STRSEL</div> <div class='ptrten' onClick='change_pref(\"GAYSEL\")'><INPUT ##if: GAYSEL##CHECKED##fi: GAYSEL## TYPE=RADIO NAME=sgw VALUE='gay'> GAYSEL</div> <div class='ptrten' onClick='change_pref(\"ANYSEL\")'><INPUT ##if: ANYSEL##CHECKED##fi: ANYSEL## TYPE=RADIO NAME=sgw VALUE='any'> ALLSEL</div>##fi: SESSION_SHOWPREFS## ##if: SESSION_HIDEPREFS##<span class='ptrten' onClick='unhide()'>>>> Set Preferences</span>##fi: SESSION_HIDEPREFS##' "; #//now try to match the string... $match_string = '/##if:[\s]SESSION_SHOWPREFS##(.+)##fi:[\s]SESSION_SHOWPREFS##/U'; $result = preg_match( $match_string, $subject, $captured ); if( $result === 0 ) print "\nResult returned as 0"; if( $result === false ) print "\nResult returned false"; #//just out of curiosity.. $it_is_false = false; $it_is_true = true; print "\nFALSE: $it_is_false, TRUE: $it_is_true\n"; #//now the data... print_r( $capture ); print "\n"; ?> <? $subject = "<td width=\"150\" background=\"images/bg_menu.gif\" bgcolor=\"#CCCCCC\"> ##if: SESSION_SHOWPREFS##<div class='ptrten' onClick='change_pref(\"STRSEL\")'><INPUT ##if: STRSEL##CHECKED##fi: STRSEL## TYPE=RADIO NAME=sgw VALUE='str'> STRSEL</div> <div class='ptrten' onClick='change_pref(\"GAYSEL\")'><INPUT ##if: GAYSEL##CHECKED##fi: GAYSEL## TYPE=RADIO NAME=sgw VALUE='gay'> GAYSEL</div> <div class='ptrten' onClick='change_pref(\"ANYSEL\")'><INPUT ##if: ANYSEL##CHECKED##fi: ANYSEL## TYPE=RADIO NAME=sgw VALUE='any'> ALLSEL</div>##fi: SESSION_SHOWPREFS## ##if: SESSION_HIDEPREFS##<span class='ptrten' onClick='unhide()'>>>> Set Preferences</span>##fi: SESSION_HIDEPREFS##' "; #//now try to match the string... $match_string = '/##if:[\s]SESSION_SHOWPREFS##(.+)##fi:[\s]SESSION_SHOWPREFS##/U'; $result = preg_match( $match_string, $subject, $captured ); if( $result === 0 ) print "\nResult returned as 0"; if( $result === false ) print "\nResult returned false"; #//just out of curiosity.. $it_is_false = false; $it_is_true = true; print "\nFALSE: $it_is_false, TRUE: $it_is_true\n"; #//now the data... print_r( $capture ); print "\n"; ?> this is my output: (Toggle Plain Text) -bash-2.05b$ php -e preg_test.php Result returned as 0 FALSE: , TRUE: 1 -bash-2.05b$ -bash-2.05b$ php -e preg_test.php Result returned as 0 FALSE: , TRUE: 1 -bash-2.05b$ Perhaps someone can tell me what I am overlooking here... I am expected it to return 1, and match the following section within the subject: (Toggle Plain Text) ##if: SESSION_SHOWPREFS##<div class='ptrten' onClick='change_pref(\"STRSEL\")'><INPUT ##if: STRSEL##CHECKED##fi: STRSEL## TYPE=RADIO NAME=sgw VALUE='str'> STRSEL</div> <div class='ptrten' onClick='change_pref(\"GAYSEL\")'><INPUT ##if: GAYSEL##CHECKED##fi: GAYSEL## TYPE=RADIO NAME=sgw VALUE='gay'> GAYSEL</div> <div class='ptrten' onClick='change_pref(\"ANYSEL\")'><INPUT ##if: ANYSEL##CHECKED##fi: ANYSEL## TYPE=RADIO NAME=sgw VALUE='any'> ALLSEL</div>##fi: SESSION_SHOWPREFS## ##if: SESSION_SHOWPREFS##<div class='ptrten' onClick='change_pref(\"STRSEL\")'><INPUT ##if: STRSEL##CHECKED##fi: STRSEL## TYPE=RADIO NAME=sgw VALUE='str'> STRSEL</div> <div class='ptrten' onClick='change_pref(\"GAYSEL\")'><INPUT ##if: GAYSEL##CHECKED##fi: GAYSEL## TYPE=RADIO NAME=sgw VALUE='gay'> GAYSEL</div> <div class='ptrten' onClick='change_pref(\"ANYSEL\")'><INPUT ##if: ANYSEL##CHECKED##fi: ANYSEL## TYPE=RADIO NAME=sgw VALUE='any'> ALLSEL</div>##fi: SESSION_SHOWPREFS## Any help would be appreciated, thanks in advance __________________ Clifford Matthew Roche <geek@cliffordroche.com> Web Hosting: http://www.crd-hosting.com Consulting: http://www.crdev-consulting.com

Jul 20th, 2004, 5:10 PM	#2
kurifu Expert Programmer Join Date: Jul 2004 Location: Halifax, Nova Scotia (Canada) Posts: 784 Rep Power: 5	Most interestingly enough if you use the following pattern to match it works fine... (Toggle Plain Text) $match_string = '/##if:[\s]SESSION_SHOWPREFS##([^z])##fi:[\s]SESSION_SHOWPREFS##/U'; $match_string = '/##if:[\s]SESSION_SHOWPREFS##([^z])##fi:[\s]SESSION_SHOWPREFS##/U'; It would seem that using (.+) is not matching something within the context of the subject... Any ideas? __________________ Clifford Matthew Roche <geek@cliffordroche.com> Web Hosting: http://www.crd-hosting.com Consulting: http://www.crdev-consulting.com

Jul 20th, 2004, 5:59 PM	#3
kurifu Expert Programmer Join Date: Jul 2004 Location: Halifax, Nova Scotia (Canada) Posts: 784 Rep Power: 5	Anyway, problem solved.. just used the following character class (I know it is redundant, but it fixed the problem) (Toggle Plain Text) [.\w\W\s\S] [.\w\W\s\S] __________________ Clifford Matthew Roche <geek@cliffordroche.com> Web Hosting: http://www.crd-hosting.com Consulting: http://www.crdev-consulting.com

Jul 20th, 2004, 6:24 PM	#4
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,466 Rep Power: 8	Glad ya got it worked out.... A question: Why do these lines of code? Were you testing to see how the booleans would appear? (Toggle Plain Text) $it_is_false = false; $it_is_true = true; print "\nFALSE: $it_is_false, TRUE: $it_is_true\n"; $it_is_false = false; $it_is_true = true; print "\nFALSE: $it_is_false, TRUE: $it_is_true\n"; __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Jul 20th, 2004, 11:32 PM	#5
kurifu Expert Programmer Join Date: Jul 2004 Location: Halifax, Nova Scotia (Canada) Posts: 784 Rep Power: 5	Yeah, I know that PHP generally tends to hold the following statements true: '0' = 0 = "0" = flase and '1' = n = "n" = true (for n = (0,oo]) And what I did to insure that there were no errors in my original source code is I stucka print statement infront of preg_match which resulted in a 0, I just wanted to make sure that PHP was not formatting my FALSE to a 0 before printing it out, so I threw that in there to check when I wrote that test script. I still find the problem to illude me, according to the Perl Regexp guide, the character '.' should match ANY character, but for some reason it was refusing to match one of the viewable characters in the string I included in that script (posted above). The solution [.\w\W\s\S]* is not a nice one, but it does work.. however redundant it may actually be. I do not see this is posing as a performance hit however since '.' would have been evaluated much the same as the character class I provided. Perhaps this is a bug in PHP4? Or perhaps I am just misinformed on the use of the '.' character class. In any case, the script I was debugging for the last two days is now much closer to being debugged, lol. __________________ Clifford Matthew Roche <geek@cliffordroche.com> Web Hosting: http://www.crd-hosting.com Consulting: http://www.crdev-consulting.com

Jul 21st, 2004, 7:55 AM	#6
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,466 Rep Power: 8	It seems to me that your initial RE should work... but I have not played with Perl REs in a while. As far as the performance degradation, I don't think there will be a noticeable difference, if any at all. __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Jul 22nd, 2004, 12:30 AM	#7
kurifu Expert Programmer Join Date: Jul 2004 Location: Halifax, Nova Scotia (Canada) Posts: 784 Rep Power: 5	I suppose the ultimate way to find out is to run the same regexp through a Perl system and see how that fairs... now the only thing is, that I do not like Perl enough to waste the time to do that... but then again if I get bored this weekend I will find out. If it runs through perl I will send a bug report (after I check to see that one does not exist first) to the lovely people behind the scenes of PHP. I suspect bug moreso then anything else though... the purpose of that character class is to match EVERYTHING from every source I have read to date. __________________ Clifford Matthew Roche <geek@cliffordroche.com> Web Hosting: http://www.crd-hosting.com Consulting: http://www.crdev-consulting.com

Jul 22nd, 2004, 12:33 AM	#8
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,466 Rep Power: 8	Yup, that's what most documentation seems to read. Let me know how it turns out. __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

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Programming Forums > Web Development and Design > PHP

This one had me...