Forum Moderators: coopster
Now I just want to programmatically change their post if they submitted a link
example:
if they submitted blah blah http://www.example.com&a=123 blah blah
I will make it [mydomain.com...]
Of course I know that I can do it this way:
preg_replace('/http:\/\/([a-z0-9\.\/,_-]+)/i', '<a href="http://www.mydomain.com/redirect.php?u=$external_url">click here</a>', $post_body);
But I dont know how can I get the whole external url so that I can pass it the the variable $external_url
Please help. Thanks
preg_replace('/http:\/\/([a-z0-9\.\/,_-]+)/i', '<a href="http://www.example.com/redirect.php?u=$1">$1</a>', $post_body);
If your question is something different and I'm missing it, please be more specific, because I think that's what you were asking for.
How can I strip a link URL from a comment post and replace it with something like [mydomain.com...]
or
[mydomain.com...]
Try this:
(It works for me.)
$post="Some text http://www.testing.com?test=test&moreTest=test some more text";
$post=preg_replace('/http:\/\/([a-z0-9\.\/,&\?=_-]+)/i', '<a href="http://www.example.com/redirect.php?u=$1">$1</a>', $post);
echo $post;
Of course this assumes URLs will always be preceded with http:// and if this is not the case, the expression will need to be adjusted.
//this will keep track of where we are in the file
$spot = 0;
//just in case there is a url as the last element we will
//add a blank space
$str .= " ";
//an array of all of the urls we will need to replace
$returnArr = array();
//fill an array of the http:// you could use a regex
//i'm just not familiar with them and I am with the string functions
//find all of the http
while(strpos($str, "http://", $spot) !== false){
//where we are in the string
$place = strpos($str, "http://", $spot);
//find the url
$tempUrl = substr($str, $place, strpos($str, " ", $place) - $place);
array_push($returnArr, $tempUrl);
$spot = strpos($str, "http://", $spot) + 1;
}//while
//make sure we have unique urls to only replace them once.
array_unique($returnArr);
It didnt work,
1. It stops displaying image on my page with the same src but no <a> tag, (It should not affect text, image without any <a> tag)
2. it change the anchor text to the link URL (anchor text shold remain the same)
3. It changes the link URl to [testing.com...] href=
I honestly think you might find it easier to use andrewsmd's method, if you are not familiar with regular expressions, because it is something you are more likely to be able to work with and adapt to your needs, but it will probably also need to be adjusted if you are running it on a full web page, because I think you will run into exactly the same issues as you did with my solution.
example.com/somscript?key=val
when you tack that on to your redirect url, you now have two query string delimiters and any key/values in the remote query string are likely to wreak havoc in redirect.php.
There are some other issues you encounter with user input, many of them may not even know what [protocol...] is. Mine doesn't address https either, and I couldn't figure out the #$%^$ period right at the end - run it and see what I mean. :-)
The goal was to experiement with a few "bad URL" conditions and encode the remote URL's troublesome characters.
<?php
header("Content-type:text/html");
// So it doesn't triple-wide the code on this board,
// a few predefined goodies:
$url_pattern = 'A-Z\d\-\_\.\%\/';
$http_escaped = 'http:\/\/';
$http = 'http://';
// Be sure to use the real pipe character here, not ¦
$tlds = 'com¦net¦org¦gov¦us¦tv';
$my_redirect = 'myredirect.php';
$output = NULL;
// A sample block of text.
$input = 'Hello, my name is Bill. I\'m here
to promote example.com. The URL is http://example.com/somescript.cgi?id=123&ref=Bill
and if you tell them "Bill sencha" I get a penny. Since I
have **sooooo** many friends this will make me an instant
millionaire. So go to http://www.example.com/somscript.php?id=123&ref=Bill as soon
as possible!
';
echo "<p>Original input:</p><p>$input</p>";
// Bleah. Make it a single line.
$input = preg_replace('/[\n\r]+/',' ',$input);
//
$words = explode(' ',$input);
//
foreach ($words as $word) {
// Couldn't figure out how to sub the period right after the tld, RATS!
$isPeriod = 0;
if (preg_match("/\.$tlds/i",$word)) {
// If you don't encode ?, &, and =, it will get munged up in myredirect.php.
// I'd use a predefined function here, but we want to ONLY encode the ones in the URL.
$untouched = $word;
$word = preg_replace('/\?/',"%3F",$word);
$word = preg_replace('/\&/',"%26",$word);
$word = preg_replace('/\=/',"%3D",$word);
if (preg_match('/.+\.$/',$word)) {
$isPeriod = 1;
$word = preg_replace('/(.+)\.$/i',"$1",$word);
}
// may or may not have http,www....
$word = preg_replace("/($http_escaped)*(www\.)*([$url_pattern]+)/i","<a href=\"$my_redirect?u=$http$2$3\">$untouched</a>",$word);
}
$output .= "$word ";
}
echo "<p>Output:</p><p>$output</p>";
echo "<p>As entites so you can see the code</p>";
echo htmlentities($output);
?>
