preg_replace backreference value as a key to array

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  • Dave
    #1

    preg_replace backreference value as a key to array

    Hi,

    This is an interesting problem I'm faced with. I have been trying all sorts
    of functions to fix it and my last resort is to ask you guys and girls.

    I have an array:
    $arr([3]=>"aaa",[104]=>"bbb",[345]=>"ccc",[n]=>"etc");
    $html='<html>.. ..<a href="page.php? var=3">3</a><a
    href="page.php? var=345">345</a...<a
    href="page.php? var=n">n</a>...</html>';

    I'm trying to get a value from URLs in HTML and use it as a key to output
    the value of $arr.
    i.e. matching the: /page.php?var=(3 45)/ will output: "ccc";

    Here is what I've tried but can't quite get there:
    $html=preg_repl ace('/(href="page\.ph p\?)(var=)([0-9]+)/si','\\1var=' .
    eval('\$c=\'\3\ '; return \$c;'),$html);
    Outputs the matched var: i.e. 345, but:

    $html=preg_repl ace('/(href="page\.ph p\?)(var=)([0-9]+)/si','\\1var=' .
    eval('\$c=\'\3\ '; return \$arr[\$c];'),$html);
    Won't output anything.

    I tried to see if the backreferencfe value is really what it seems
    (integer), but when I do:
    $html=preg_repl ace('/(href="page\.ph p\?)(var=)([0-9]+)/si','\\1var=' .
    eval('\$c=\'\3\ '; \$c=gettype(\$c ); return \$c;'),$html);
    it shows it's a string. If I try: \$c*1, outputs is 0. If I try
    settype(\$c,"in teger"), the output again is 0.

    Another strange thing. This: "return \$c;" returns the 345, but return
    strlen(\$c); returns 2.

    Please, save me from this madness! :)

    Thanks

    Dave


    Tags: None
    • Chung Leong
      #2
      Re: preg_replace backreference value as a key to array

      Dave wrote:
      Hi,
      >
      This is an interesting problem I'm faced with. I have been trying all sorts
      of functions to fix it and my last resort is to ask you guys and girls.
      >
      I have an array:
      $arr([3]=>"aaa",[104]=>"bbb",[345]=>"ccc",[n]=>"etc");
      $html='<html>.. ..<a href="page.php? var=3">3</a><a
      href="page.php? var=345">345</a...<a
      href="page.php? var=n">n</a>...</html>';
      >
      I'm trying to get a value from URLs in HTML and use it as a key to output
      the value of $arr.
      i.e. matching the: /page.php?var=(3 45)/ will output: "ccc";
      >
      Here is what I've tried but can't quite get there:
      $html=preg_repl ace('/(href="page\.ph p\?)(var=)([0-9]+)/si','\\1var=' .
      eval('\$c=\'\3\ '; return \$c;'),$html);
      Outputs the matched var: i.e. 345, but:
      >
      $html=preg_repl ace('/(href="page\.ph p\?)(var=)([0-9]+)/si','\\1var=' .
      eval('\$c=\'\3\ '; return \$arr[\$c];'),$html);
      Won't output anything.
      >
      I tried to see if the backreferencfe value is really what it seems
      (integer), but when I do:
      $html=preg_repl ace('/(href="page\.ph p\?)(var=)([0-9]+)/si','\\1var=' .
      eval('\$c=\'\3\ '; \$c=gettype(\$c ); return \$c;'),$html);
      it shows it's a string. If I try: \$c*1, outputs is 0. If I try
      settype(\$c,"in teger"), the output again is 0.
      >
      Another strange thing. This: "return \$c;" returns the 345, but return
      strlen(\$c); returns 2.
      >
      Please, save me from this madness! :)
      Read the following:

      PHP: parse_url - Manual
      http://fi.php.net/manual/en/function.parse-url.php
      Parse a URL and return its components

      PHP: parse_str - Manual
      http://fi.php.net/manual/en/function.parse-str.php
      Parse a string as a URL query string


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