PNG Alpha Transparency

[gmarik]

Is this good enough? http://www.koivi.com/ie-png-transparency/


<?php
/*
* replacePngTags - Justin Koivisto [W.A. Fisher Interactive] 7/1/2003 10:45AM
*
* Modifies IMG tags for MSIE5+ browsers to ensure that PNG-24 transparencies
* are displayed correctly. Replaces original SRC attribute with a transparent
* GIF file (spacer.gif) that is located in the same directory as the orignal
* image, and adds the STYLE attribute needed to for the browser. (Matching
* is case-insensitive.
*
* @param $x String containing the content to search and replace in.
* @result Returns the modified string.
*/
function replacePngTags($x){
// make sure that we are only replacing for the Windows versions of Internet
// Explorer 5+, and not Opera identified as MSIE
$msie='/msie\s([5-9])\.?[0-9]*.*(win)/i';
$opera='/opera\s+[0-9]+/i';
if(!isset($_SERVER['HTTP_USER_AGENT']) ||
!preg_match($msie,$_SERVER['HTTP_USER_AGENT']) ||
preg_match($opera,$_SERVER['HTTP_USER_AGENT']))
return $x;

// OK, time to find all the IMG tags with ".png" in them
preg_match_all('/<img.*\.png.*>/Ui',$x,$images);
while(list($imgnum,$v)=@each($images[0])){
$original=$v;
$atts=''; $width=0; $height=0;
// If the size is defined by styles, find
preg_match_all('/style=".*(width: ([0-9]+))px.*'.
'(height: ([0-9]+))px.*"/Ui',$v,$arr2);
if(is_array($arr2) && count($arr2[0])){
// size was defined by styles, get values
$width=$arr2[2][0];
$height=$arr2[4][0];
}
// size was not defined by styles, get values
preg_match_all('/width=\"?([0-9]+)\"?/i',$v,$arr2);
if(is_array($arr2) && count($arr2[0])){
$width=$arr2[1][0];
}
preg_match_all('/height=\"?([0-9]+)\"?/i',$v,$arr2);
if(is_array($arr2) && count($arr2[0])){
$height=$arr2[1][0];
}
preg_match_all('/src=\"([^\"]+\.png)\"/i',$v,$arr2);
if(isset($arr2[1][0]) && !empty($arr2[1][0]))
$image=$arr2[1][0];
else
$image=NULL;

// We do this so that we can put our spacer.gif image in the same
// directory as the image
$tmp=split('[\\/]',$image);
array_pop($tmp);
$image_path=join('/',$tmp);
if(strlen($image_path)) $image_path.='/';

// end quote is already supplied by originial src attribute
$replace_src_with=$image_path.'spacer.gif" style="width: '.$width.
'px; height: '.$height.'px; filter: progidXImageTransform.'.
'Microsoft.AlphaImageLoader(src=\''.$image.'\', sizingMethod='.
'\'scale\')';

// now create the new tag from the old
$new_tag=str_replace($image,$replace_src_with,$ori ginal);

// now place the new tag into the content
$x=str_replace($original,$new_tag,$x);
}
return $x;
}
?>

[KuraFire]

you may wanna remove the whole quoted function and try to re-paste it using a standard or basic editor interface - the WYSIWYG f\/cks it up big time...

[assassingod]

Fixed

[gmarik]

Thanks. So I save it as the alpha.php file.
How do I require it in the vBulletin options?

[Natch]

OMG Thanks!