[Resolved] URL challenges

dianaqt

I am trying to harvest specific information from a url with appended values of a1, a2, a3 & a4.

I am specifically interested in the contents of the value in a3...

The problem that I'm having is that a3's values are passed like this:

And they look like this to the receiving page:

&a3=%3Cimg%20src%3D%22http%3A//store6.yimg.com/I/organizeeverything1_1779_6047677%22%20width%3D673%20height%3D500%20border%3D0%20hspace%3D0%20vspace%3D0%3E

I need to specifically access & change the width and the height (I have already built the function that can altar those)

My problem is getting the numbers that are assigned to width & height in the URL, assigned to $w and $h, and then after I change it I need to replace the old values of width & height to the new ones in the new URL.

I am not sure where to start with this... I've looked at the following references, but I don't think I'm barking up the right tree with these.

http://www.php.net/manual/en/function.parse-url.php

and

http://www.php.net/manual/en/function.preg-replace.php

Any help or direction you could give me would be greatly appriciated. I'm not sure how I should approch this one.

Thanks in advance,

Diana

Pig

You can run it through raw url decode to get it to look right
(http://www.php.net/manual/en/function.rawurldecode.php)

HTH

dianaqt

Ok...

So far, I run a3's value through the following:

$a3 = rawurldecode($a3);

This will give me a 'normal' url (without all of the %'s and such).

That helps a bunch... Thank you!

As far as isolating the 500 value from the height and the 673 value from width...

Would exploding a3's values at the spaces help me? It seems that would just further complicate the task.

I've found the following reference from this board and it is very close to what I'm trying to accomplish.

The only thing that was left out was what I'm struggling with right now:

"I've poked around the forums and was able to solve the extraction of the image url... " Quote from: http://www.phpbuilder.com/board/showthread.php?s=&threadid=10251701&highlight=replace+url

I know the answer's here somewhere... but I've 'poked around' for about 3 hours & can't seem to find the answer.

Any direction here would mean a lot.

Thanks,

Diana

Pig

The solution in the post you linked to looked right on, except that you would want to do preg_match() instead of preg_replace(). I am no good at regex, so I can't give you any advice on the pattern to match with. I'm sure the solution in the other post is very close.

Maybe:
preg_match("/height=\"([0-9])\"/", $url, $matches);
echo( $matches[0] );

That might do it.

dianaqt

Thanks Pig... It's still not tested live but how does this look so far?

The info coming from $a3 will look like this:

&a3=%3Cimg%20src%3D%22http%3A//store6.yimg.com/I/organizeeverything1_1779_6047677%22%20width%3D673%20height%3D500%20border%3D0%20hspace%3D0%20vspace%3D0%3E

$SetHeight = 100;  //Establishes a Height Parameter of 100
$SetWidth = 135;  //Establishes a Width Parameter of 135
$image_ = $a3;  //The image data comes in from URL as $a3
$image_ = stripslashes($image_);
$image_ = rawurldecode($image_); 


//Harvests the numerical info from height= portion of $image_ and sets result to $H
preg_match("/height=([0-9])/i", $image_, $matches);
$H = $matches[0];

//Harvests the numerical info from width= portion of $image_ and sets result to $W
preg_match("/width=([0-9])/i", $image_, $matches);
$W = $matches[0];


if (($H > $SetHeight) OR ($W > $SetWidth)) { //If $H or $W is larger than allowed...

if $H > $W { // check to see if $H of image is larger than $W
	$ConstraintRatio = ($W / $H);  // Figures out what constraint ratio is
	$ConstraintRatio = round($ConstraintRatio, 4);  // Rounds to x.xxxx
	$W = ($SetHeight * $ConstraintRatio); // Finds new image width
	$W = round($W); //Rounds to whole number
	$H = $SetHeight; //Utilizes the $SetHeight as the $H
}

if $W > $H { // check to see if $W of image is larger than $H
	$ConstraintRatio = ($H / $W);   // Figures out what constraint ratio is
	$ConstraintRAtio = round($ConstraintRatio, 4);  // Rounds to x.xxxx
	$H = ($SetWidth * $ConstraintRatio); // Finds new image height
	$H = round($H); //Rounds to whole number
	$W = $SetWidth; //Utilizes the $SetWidth as the $W
}

}

$image_ = preg_replace('/height=([0-9])/i',$H,$image_); // Replaces old height with new one
$image_ = preg_replace('/width=([0-9])/i',$W,$image_); // Replaces old width with new one

Do you see any obvious n00bie blunders? Or am I just a moron? 😉

Pig

Looks fine at a glance. If it doesn't work, just debug it one sequence at a time until you find out where it doesn't return the expected.

dianaqt

Thanks soooo much pig...

I had a few minor glitches in my coding, but nothing too difficult to figure out.

I really appriciate your direction on this!

Here is the working code incase anyone ever needs a similar solution:

$SetHeight = 100;  //Establishes a Height Parameter of 100
$SetWidth = 135;  //Establishes a Width Parameter of 135
$image_ = $a3;  //The image data comes in from URL as $a3
$image_ = stripslashes($image_);

//Harvests the height=*** portion of $image_ and sets result to $H
preg_match("/height=([0-9]{1,} )/i", $image_, $matches);
$H = $matches[0];
//Harvests the numerical info from height= portion of $image_ and sets result to $H
preg_match("/([0-9]{1,})/", $H, $matches);
$H = $matches[0];

//Harvests the width=*** portion of $image_ and sets result to $W
preg_match("/width=([0-9]{1,} )/i", $image_, $matches);
$W = $matches[0];
//Harvests the numerical info from height= portion of $image_ and sets result to $H
preg_match("/([0-9]{1,})/", $W, $matches);
$W = $matches[0];


if (($H > $SetHeight) OR ($W > $SetWidth)) { //If $H or $W is larger than allowed...

if ($H > $W) { // check to see if $H of image is larger than $W
	$ConstraintRatio = ($W / $H);  // Figures out what constraint ratio is
	$ConstraintRatio = round($ConstraintRatio, 4);  // Rounds to x.xxxx
	$W = ($SetHeight * $ConstraintRatio); // Finds new image width
	$W = round($W); //Rounds to whole number
	$H = $SetHeight; //Utilizes the $SetHeight as the $H
}

if ($W > $H) { // check to see if $W of image is larger than $H
	$ConstraintRatio = ($H / $W);   // Figures out what constraint ratio is
	$ConstraintRAtio = round($ConstraintRatio, 4);  // Rounds to x.xxxx
	$H = ($SetWidth * $ConstraintRatio); // Finds new image height
	$H = round($H); //Rounds to whole number
	$W = $SetWidth; //Utilizes the $SetWidth as the $W
}

}
$newH = ("height=".$H." "); //gets height back into correct format
$newW = ("width=".$W." "); //gets width back into correct format
$image_ = preg_replace('/height=([0-9]{1,} )/i',$newH,$image_); // Replaces old height with new one
$image_ = preg_replace('/width=([0-9]{1,} )/i',$newW,$image_); // Replaces old width with new one

Thanks again!

Diana