Replacing urls by imagetags incl. size!

[Anon]

Okay... I got a problem.

I get a string from a database containing text, let's call it $text. $text contains whole sentences including URLs of images. For example, $text could be: "Hello, this url could be an image http://www.slook.nl/site.gif and I want to have some control here";

Also, $text can contain more than one URL of images.

Now I already figured a way to change the URL in <IMG SRC="http://www.slook.nl/site.gif" BORDER=1> using eregi_replace, but I want more.

I also want to change the image height and width if these exceed a certain size. I know I can use the GetImageSize() function to get the size of an image but how do I incorporate that with the eregi_replace function so it will convert the URL to an image tag AND add the height and width elements?

Something like:

function ResizeFunction($url){
img = GetImageSize($url);
if ($img[0] > 500){
$width = "500";
}
else {
$width = $img[0];
}
return $width;
}

$text = eregi_replace("http://[%a-z0-9/@._\~:\?+\=\&,-]+","<IMG SRC='\1' " . $width = ResizeFunction('\1') . " BORDER=1>",$text);

Anyone got an idea about this?

[Anon]

Hm, if you get (and resize) the width and height before running the ereg, you can go

$img=GetImageSize($url);
$width=$img[0]>500?500:$img[0];
$height=$img[1]*$width/$img[0]; //for proportional scaling
$text=eregi_replace(....,"<img src='\1' width='$width' height='$height' border='11'>",$text);

[Anon]

Well... the problem is I don't know how many URL's there are in the text and where they will be. It's part of a forum, where people can type their messages.

But on another forum I got a hint to have a look at preg_replace(), which should be able to handle functions.

[Anon]

Ah yes, the preg_* functions are generally more flexible - the hint would be regardng the /e modifier, would it not? Where the replacement string is effectively eval()ed and the result applied.

Check out preg_replace_callback() while you're at it :-)

[Anon]

I'm at it... thanx! 8-)

[Anon]

Thanx Hayley, I got it working now using Preg_Replace(/e)!

Cheers mate!

Ronald

[Anon]

Glad to be of service - though I should have been six hours faster 🙂