resolving full path of images

[leatherback]

Hi All,

At the moment I am trying to resolve paths of products for a price comparison site. Problem is, when products are added, and the provider does not provide a product stream, I need to parse the page, and retieve the info from there.

I how have all the images on a page in an array, and am trying to resolve the full path to image. So I wrote the function below, but I am not sure whether I am setting myself up for a big fall.

I cannot get the regexp to work properly; when I insert a file like '/path/to/file.jpg' it is not matched by the expression '^\//'
Any suggestions?

function image_path_and_size($image, $url, $dimensions=array(350,300))
  {  

  /*
  parameters:
  $image: The image url we want to resolve
  $url: Url of product page
  $dimensions: Preferred dimensions. Return rankingvalue

  Path options:
  ./[info] 		= Within directory path
  ../[info] 		= Relative, in higher level path
  http://..[info] 	= Absolute path
  [info		= Within directory path
  */

  $pp = parse_url($url);

  $patterns = array(
  '/^\//',
  '/^\.\//',
  '/^http/');

  $replace = array(
  $pp['scheme'].$pp['host'],
  $pp['scheme'].$pp['host'].$pp['path'],
  $pp['scheme']);

  if(! preg_replace($patterns, $replace, $image))
    {
	// Explode the path
	$imgpcs 	= explode('/',$image);
	$i 			= 0;
	$image		= '';
	foreach($imgpcs as $pc)
	  {
	  if($pc == '..')
	    {
		$i++;
		}
	  else
	    {
		if($i == 0)
		  {
		  $image .= '/'.$pc;
		  }
		else
		  {
		  $i--;
		  }
		}
	  }
	}
  return $image;
  }

[sneakyimp]

maybe try preg_match instead of preg_replace?

[leatherback]

hm.. just modified sme things, and I think I have it all going. If anybody sees a potential pitfall.. please let me know:

function image_path($image, $url)
  {
  /*
  parameters:
  $image: The image url we want to resolve
  $url: Url of product page

  Path options:
  ./[info] 		= Within directory path
  ../[info] 		= Relative, in higher level path
  http://..[info] 	= Absolute path
  [info]		= Within directory path
  */

  $pp = parse_url($url);
  if(array_key_exists('path', $pp))
    {
	if(! strpos($pp['path'], '.') === false)
	  {
	  $pp = parse_url(dirname($url));
	  if(! array_key_exists('path', $pp))
        {
		$pp['path'] = '';
		}
	  }
	}
  else
    {
	$url['path'] = '';
	}

  $patterns = array(
  '/^http/',
  '/^\//',
  '/^\.\//');

  $replace = array(
  $pp['scheme'].'://',
  $pp['scheme'].'://'.$pp['host'].'/',
  $pp['scheme'].'://'.$pp['host'].$pp['path'].'/'
  );

  $image = preg_replace($patterns, $replace, $image, 1, $repcount);

  if($repcount == 0)
    {	
	// Explode the path
	$imgpcs 	= explode('/',$image);
	$i 			= 0;
	$image		= array();
	foreach($imgpcs as $pc)
	  {
	  if($pc == '..')
	    {
		$i++;
		}
	  else
	    {
		$image[] = $pc;
		}
	  }

$image = implode('/', $image);
$path = array();
$pathpcs = explode('/', $pp['path']);
for($j=1; $j < count($pathpcs)-$i; $j++)
  {
  $path[] = $pathpcs[$j];
  }
  print_r($pp);
$path = implode('/', $path);
$image =   $pp['scheme'].'://'.$pp['host'].'/'.$path.'/'.$image;
}
  return $image;
  }