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Quellcode:

<?php
/*
* URL Encoder script.
* Version 1.0 - February 2002
* (c) 2002, Paul Gregg <pgregg@pgregg.com>
* http://www.pgregg.com
*
* Function: Take an href link and the visible text and make an obfuscated
* link to prevent search engines (or spam harvesters) from picking it up.
*
* Open Source Code: If you use this code on your site for public
* access (i.e. on the Internet) then you must attribute the author and
* source web site: http://www.pgregg.com/projects/
* You must also make this original source code available for download
* unmodified or provide a link to the source. Additionally you must provide
* the source to any modified or translated versions or derivatives.
*
*/


$PHP_SELF = $_SERVER['PHP_SELF'];
$href = isset($_GET['href']) ? $_GET['href'] : '';
$text = isset($_GET['text']) ? $_GET['text'] : '';
$func = isset($_GET['func']) ? $_GET['func'] : '';

printf("<p align=right><a href=\"%ss\">Source code</a></p>\n", $PHP_SELF);

$encoder_functions = array (
"transpose" => "Transpose characters / Javscript",
"hash" => "Hashes characters / No Javscript"
);
$valid_functions = array_keys($encoder_functions);


if ($href != "") {
# Encode the $href string according to the selected function

if ($text == "")
$text = "No text specified.";

Function escapeencode ($str) {
$ret = "";
$arr = unpack("C*", $str);
foreach ($arr as $char)
$ret .= sprintf("%%%X", $char);
return $ret;
}

Function transpose($str) {
# function takes the string and swaps the order of each group of 2 chars
$len = strlen($str);
$ret = "";
for ($i=0; $i<$len; $i=$i+2) {
if ($i+1 == $len)
$ret .= substr($str, $i, 1);
else
$ret .= sprintf("%s%s", substr($str, $i+1, 1), substr($str, $i, 1));
}
return $ret;
}

# replace wierd chars in the href
$href = preg_replace("/[;,]/", "", $href);

if (! isset($func) ) {
$func = "transpose";
} else {
if (! in_array($func, $valid_functions) )
$func = "transpose"; # prevent bogus functions
}

printf("<p>Encoding link <b>%s</b> using function <b>%s</b></p>\n",
htmlspecialchars($href), $func);

if ($func == "transpose") {

$code = sprintf("var s='%s';var r='';for(var
i=0;i<s.length;i++,i++) {r=r+s.substring(i+1,i+2)+s.substring(i,i+1)}document.write('<a
href=\"'+r+'\">%s</a>');", transpose($href), $text);
$UserCode = sprintf("%s%s%s",
"<SCRIPT language=\"javascript\">eval(unescape('",
escapeencode($code),
"'))</SCRIPT>");

} elseif ($func == "hash") {

$prepend = "";
if (preg_match("/^mailto:/", $href)) {
$href = preg_replace("/^mailto:/", "", $href);
$prepend = "mailto:";
}
if (preg_match("/^http:\/\//", $href)) {
$href = preg_replace("/^http:\/\//", "", $href);
list($server,$url) = split("/", $href, 2);
$href = $url;
$prepend = "http://$server/";
}
$UserCode = sprintf("<a href=\"%s%s\">%s</a>",
$prepend,
escapeencode($href), $text);

}

printf("<p>Cut and paste the following code into your page where you want the link to
be:</p><pre>\n%s\n</pre>\n<hr>\n%s</p>\n",
htmlspecialchars($UserCode), $UserCode);

} else {

print "Add encoded mailto: (or not) links into webpages preventing spammers robots from harvesting them.\n";
print "<form method=GET action=\"$PHP_SELF\">";
?>
<table>
<tr><td>Link/href</td>
<td><input type=text name=href value="mailto:" size=30></td>
</tr>
<tr><td>Displayed text</td>
<td><input type=text name=text value="" size=30></td>
</tr>
<tr><td>Encoding Function</td>
<td><select name=func>
<?php
foreach ($encoder_functions as $key => $value)
printf("<option value=\"%s\">%s</option>", $key, $value);
?>
</select></td>
</tr>
<tr><td></td><td><input type=submit value="Encode"></td></tr>
</table>
</form>

<?php
}

?>