At 10:16 PM 1/5/2002 -0500, Gerard Samuel wrote:
>Need some help with this one. Dont know where to begin. I have content
>in a string and a constant that changes depending on if yourre in the root
>or in a directory.
>The purpose of the constant is to provide dynamic links.
>The string will have href links like <a href="index.php">Index</a>
>I want to figure out a way to inject my constant value into the href like so
><a href="'._CONSTANT'index.php">Index</a>
>I would like the rules to say,
>If string contains <href="> and there are <alphanumerical chars> .php
>place _CONSTANT between <href="> and <alphanumerical chars>
>I figure a regular expression, but I have no idea where to start..
This seems to work:
<?
define("_CONSTANT","/path/");
$string = "Click <a href=\"index.php\">here</a> to return to the main page.";
echo insertpath($string);
function insertpath($string) {
return preg_replace("/(<a
href=\")(.*\">.*<\/a>)/i","$1"._CONSTANT."$2",$string);
}
?>
Preg_replace allows you to use backreferences and access them via variables
such as $1 and $2, etc. Earlier versions of PHP required you to use \\1,
\\2 instead (see the documentation for preg_replace for more info). Each
section of the regex that is in parenthesis can be accessed. In the above
example, the (<a href=\") section is reprinted in the replacement string by
using $1, so on a so forth. The ".*" in the regex basically means match
"any old junk" since the "." refers to any single character and the "*"
means match the previous character zero or more times.
http://download.php.net/manual/en/function.preg-replace.php
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