检查相对URL并替换为绝对值

Question

I have a dynamic php code as follows

$url = "http://www.myweb.com/home";
$mycontents = 'These are the contents with <a href="myweb/local.php" />relative link</a> and <a href="http://www.myweb.com/home/loc.php"> absolute link</a> and some images with <img src="myweb/local.jpg" /> with relative link and <img src="http://www.myurl.com/pictures/pic.jpg" />';

$url and $mycontents are changing depending on the data fetched, even links contained changes. Any function that will SCAN for the variable $mycontents and if found any link with a or src, check first to see if is absolute, if yes, leave it, if no, using str_replace str_replace("src=\"", "src=\"".$url, $mycontents) and change all links before echoing $mycontents, Target is, once $mycontents get echoed, has to be modified with all relative links scanned and found changed to absolute.

Answer 1

First you should identify exactly what attributes you need to be looking for and checking their values. The simplest check of course is to simply look for URLcontaining http(s):// at the beginning of them and classing them as absolute already, anything else needs to be replaced.

These attributes would be href and src, as a base.

Of course, it's a very rudimentary check but it should suit your needs at least for now, barring any edge cases that may arise.