Snippets Http
Http
Replace value of a parameter in a query string
by: Dustin Voss
|
March 11, 2005
Version: 1.0
Type: Function
Category: HTTP
License: GNU General Public License
Description: A function to add or replace the value of a particular query parameter. It assumes typical &-separated parameters. -- Parameters -- $query The query string, still url-encoded. $param The query parameter to change the value of. Not url-encoded. $value The new value for the parameter. Not url-encoded. Returns the new query string, with parameter names and values url-encoded.
/**
* Add or replace the value of a particular query parameter.
* Assumes typical &-separated parameters. Case-sensitive.
*
* $query The query string, still url-encoded.
* $param The query parameter to change the value of. Not url-encoded.
* $value The new value for the parameter. Not url-encoded.
* Returns the new query string, with parameter names and values url-encoded.
*/
function ReplaceQueryValue ($query, $param, $value)
{
// Prepend & so all parameters are delimited by &...=
if (!empty($query)) $query = '&' . $query;
$param = '&' . urlencode($param) . '=';
$value = urlencode($value);
// Find occurance of parameter
$index = strpos ($query, $param);
if ($index === false)
{
// Not present. Append param/value.
$query .= $param . $value;
}
else
{
// Delimit & replace value part.
$valstart = $index + strlen ($param);
$valend = strpos ($query, '&', $valstart);
if ($valend === false) $valend = strlen ($query);
$query = substr_replace ($query, $value, $valstart,
$valend - $valstart);
}
return substr ($query, 1);
}
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