Re: [PHP] quotemeta() question...
Jason Barnett wrote: Richard Lynch wrote: Steve Kaufman wrote: Why does quotemeta(pat:1$WRW) return pat:1 instead of pat:1\$WRW What am I misunderstanding about quotemeta function? You usually would use quotemeta on data coming from the database, or the user, or externally, or, errr, basically things you haven't typed in to PHP, that you need to pass into Regular Expressions. In those cases, you've already got the $ (and other characters) successfully embedded in the string, but you want to escape them for whatever reason. A better example code would be: $string = 'period.backslash\\plus+star*question?lbracket[rbracket]carat^lparen(rparen)dollar$'; echo PRE, quotemeta($string), /PRE; Interesting aside... with the test string above, I noticed that backslash\\ only resolved to two backslashes. I thought there would be 4. It seems that quotemeta will resolve \ and \\ to \\, \\\ and resolve to , etc. No, no, no. FORGET quotemeta for a moment. *BEFORE* the string ever GETS to quotemeta, PHP takes the characters you typed and builds a string. For PHP, \\ inside of apostrophes turns into a single \. You Type: Internal PHP string '\\' \ '\'' ' '' \\ \\ \ \ It's absolutely crucial that you understand that PHP itself alters the \\ to \ lonnng before quotemeta enters the picture. If you use just '\' in what you type, PHP is kinda stuck with just assuming you meant '\\' and it runs with \ as its internal representation. This is documented behaviour, but I consider it Bad Style. So using \ or \\\ or any odd number of \ inside of apostrophes/quotes to get a backslash in the internal PHP string is just plain bogus, if you ask me. [shrug] At any rate, quotemeta is *NOT* the thing that converts \ and \\ into \\. PHP converts \ and \\ into a single \ quotemeta converts that single \ into \\ -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] quotemeta() question...
Steve Kaufman wrote: Why does quotemeta(pat:1$WRW) return pat:1 instead of pat:1\$WRW What am I misunderstanding about quotemeta function? You usually would use quotemeta on data coming from the database, or the user, or externally, or, errr, basically things you haven't typed in to PHP, that you need to pass into Regular Expressions. In those cases, you've already got the $ (and other characters) successfully embedded in the string, but you want to escape them for whatever reason. A better example code would be: $string = 'period.backslash\\plus+star*question?lbracket[rbracket]carat^lparen(rparen)dollar$'; echo PRE, quotemeta($string), /PRE; -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] quotemeta() question...
Richard Lynch wrote: Steve Kaufman wrote: Why does quotemeta(pat:1$WRW) return pat:1 instead of pat:1\$WRW What am I misunderstanding about quotemeta function? You usually would use quotemeta on data coming from the database, or the user, or externally, or, errr, basically things you haven't typed in to PHP, that you need to pass into Regular Expressions. In those cases, you've already got the $ (and other characters) successfully embedded in the string, but you want to escape them for whatever reason. A better example code would be: $string = 'period.backslash\\plus+star*question?lbracket[rbracket]carat^lparen(rparen)dollar$'; echo PRE, quotemeta($string), /PRE; Interesting aside... with the test string above, I noticed that backslash\\ only resolved to two backslashes. I thought there would be 4. It seems that quotemeta will resolve \ and \\ to \\, \\\ and resolve to , etc. -- Teach a man to fish... NEW? | http://www.catb.org/~esr/faqs/smart-questions.html STFA | http://marc.theaimsgroup.com/?l=php-generalw=2 STFM | http://www.php.net/manual/en/index.php STFW | http://www.google.com/search?q=php LAZY | http://mycroft.mozdev.org/download.html?name=PHPsubmitform=Find+search+plugins signature.asc Description: OpenPGP digital signature
Re: [PHP] quotemeta() question...
Jason Barnett wrote: Richard Lynch wrote: Steve Kaufman wrote: Why does quotemeta(pat:1$WRW) return pat:1 instead of pat:1\$WRW What am I misunderstanding about quotemeta function? You usually would use quotemeta on data coming from the database, or the user, or externally, or, errr, basically things you haven't typed in to PHP, that you need to pass into Regular Expressions. In those cases, you've already got the $ (and other characters) successfully embedded in the string, but you want to escape them for whatever reason. A better example code would be: $string = 'period.backslash\\plus+star*question?lbracket[rbracket]carat^lparen(rparen)dollar$'; echo PRE, quotemeta($string), /PRE; Interesting aside... with the test string above, I noticed that backslash\\ only resolved to two backslashes. I thought there would be thats correct... echo \\; // shows one backslash 4. It seems that quotemeta will resolve \ and \\ to \\, \\\ and resolve to , etc. -- Teach a man to fish... NEW? | http://www.catb.org/~esr/faqs/smart-questions.html STFA | http://marc.theaimsgroup.com/?l=php-generalw=2 STFM | http://www.php.net/manual/en/index.php STFW | http://www.google.com/search?q=php LAZY | http://mycroft.mozdev.org/download.html?name=PHPsubmitform=Find+search+plugins -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] quotemeta() question...
Jochem Maas wrote: ... A better example code would be: $string = 'period.backslash\\plus+star*question?lbracket[rbracket]carat^lparen(rparen)dollar$'; echo PRE, quotemeta($string), /PRE; Interesting aside... with the test string above, I noticed that backslash\\ only resolved to two backslashes. I thought there would be thats correct... echo \\; // shows one backslash Well in the example above it was a single quote, not a double quote. But either way... I would have thought there would be a 1:1 relationship in the quotemeta translation (either quote all of them, or assume they are all quoted already). 4. It seems that quotemeta will resolve \ and \\ to \\, \\\ and resolve to , etc. See above. I would think (given my own common sense as well as the man page for quotemeta) that there would be a quote added to each of these. But the results don't quite match this... -- Teach a man to fish... NEW? | http://www.catb.org/~esr/faqs/smart-questions.html STFA | http://marc.theaimsgroup.com/?l=php-generalw=2 STFM | http://www.php.net/manual/en/index.php STFW | http://www.google.com/search?q=php LAZY | http://mycroft.mozdev.org/download.html?name=PHPsubmitform=Find+search+plugins signature.asc Description: OpenPGP digital signature
Re: [PHP] quotemeta() question...
Jason Barnett wrote: Jochem Maas wrote: ... A better example code would be: $string = 'period.backslash\\plus+star*question?lbracket[rbracket]carat^lparen(rparen)dollar$'; echo PRE, quotemeta($string), /PRE; Interesting aside... with the test string above, I noticed that backslash\\ only resolved to two backslashes. I thought there would be thats correct... echo \\; // shows one backslash I should have been clearer: echo \\; // shows one backslash echo '\\'; // shows one backslash the backslash is a metachar in both single and double quoted strings so regardless of the quotes used in order to write a literal backslash in a string you must 'backslash' it. you still not with me?: echo '\'; // does this parse? so the output of metaquote() is correct. Well in the example above it was a single quote, not a double quote. But either way... I would have thought there would be a 1:1 relationship in the quotemeta translation (either quote all of them, or assume they are all quoted already). it quotes them all AFAIT. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] quotemeta() question...
Because it's parsing $WRW as a string, because of the double quotes. so
you would need to do it like this:
quotemeta('pat:1$WRW')
to not let it parse any variables
or
quotemeta(pat:1\$WRW)
to not parse that particular variable
Steve Kaufman wrote:
Why does
quotemeta(pat:1$WRW)
return
pat:1
instead of
pat:1\$WRW
What am I misunderstanding about quotemeta function?
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