Replace html tags and pass to function in php

Question

I have an HTML file that has external assets on a secure server that needs a url generated in order to load. I can load the HTML file fine, but none of the images will load. Relative paths wont work. I need to pass the image src attribute to my generateURL method and replace the current relative src paths with my generated url. An example HTML file I need to replace the tags in would be:

<img id="Im0" src="slide1page1/img/1/Im0.png" alt="Im0" width="720" height="540" style="display: none" />
<img id="Im1" src="slide1page1/img/1/Im1.png" alt="Im1" width="136" height="60" style="display: none" />
<img id="Im2" src="slide1page1/img/1/Im2.png" alt="Im2" width="669" height="45" style="display: none" />

My php script that I load the page through is:

<?php
function generateURL($target,$seconds)
{
    $secret = "mysecretpasscode";
    $end    = time() + $seconds;
    $url    = $target . "?e=" . $end;
    $toHash = $secret . $url;
    $secure = $url . "&h=" . md5($toHash);
    return $secure;
}
$id     = $_POST['id'];
$loc    = $_POST['loc'];
$url    = $loc . "slide" . $id . ".html";
$secure = generateURL($url,600); 
$page   = file_get_contents($secure);
?>

if I echo $page, I can see the page as if I just loaded an html page (but no images). What I need to do before that is find all the src tags in the HTML and run them through my generateURL method so I can generate the correct URL with proper hashing to load. I am thinking a str_replace will work, but I am not familiar enough with regex to continue. Any help would be appreciated.

Why don't you use PHP DOM instead? Then you can just select the images using xpath. php.net/manual/en/domxpath.query.php — Calvin Froedge
– Calvin Froedge, Commented Nov 18, 2011 at 19:23
I am not familiar with this. I am seeing a lot of XML references. This looks like it may be doing something that I would want: php.net/manual/en/domxpath.query.php#73557 . I will try and find more examples, but if you have a simple one of what I am wanting to do that'd be great — Ronnie
– Ronnie, Commented Nov 18, 2011 at 19:44
ok I am making progress! I am at this point where I have selected all the tags and generated new URLs...How do I replace them now? pastie.org/2885066 — Ronnie
– Ronnie, Commented Nov 18, 2011 at 20:03
ok I am doing $dom->replaceChild($new,$old) in the loop and then after the loop I do echo $dom->saveHTML(); and I get a blank screen. $old is $old = $image->getAttribute('src');, $new is $new = generateURL($loc . $old, 600);...not sure why I am getting a blank screen — Ronnie
– Ronnie, Commented Nov 18, 2011 at 20:27
Check this thread out: stackoverflow.com/questions/3194875/… — Calvin Froedge
– Calvin Froedge, Commented Nov 18, 2011 at 20:35

Community · Accepted Answer · 2017-05-23 10:24:22Z

0

First have a look at this answer: RegEx match open tags except XHTML self-contained tags

Though I think you could use PHP's preg_replace_callback as follows:

src_regex = "/src=\"([^\"]+\/";
preg_replace_callback(src_regex, generateURL, html);

Do take into account that the second parameter (generateURL) must be a function with only a single argument, take a look at this page.

edited May 23, 2017 at 10:24

CommunityBot

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answered Nov 18, 2011 at 19:29

noio

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Mob · Accepted Answer · 2011-11-18 19:30:03Z

0

A html parser would be better. Provided you've selected all the tags, you can extract the relative path with the function below.

$u = '<img id="Im0" src="slide1page1/img/1/Im0.png" alt="Im0" width="720" height="540" style="display: none" />';
$v = explode(" ", $u);
$x = explode("=", $v[2]);
echo str_replace("\"", "", $x[1]);

Outputs

slide1page1/img/1/Im0.png

answered Nov 18, 2011 at 19:30

Mob

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