Checking an image for it's size.

[TexasMd91]

I am using a script my friend made to randomly select an image from the directory and output it, I want to change it so that I can specify the minimum and maximum size (in pixel) that the image can be, so if a forum has rules on size I can still use the dynamic sig.

 

I have changed the code a bit to bring in the size variable, but I am stumped on where to go from there  ???.

 

x0 = x min

x1 = x max

y0 = y min

y1 = y max

 

I need to have it so that if the value is set to 0, then it will disable.

 

so if I have  x0=0 and x1=250 it would be any graphic less then 250px wide. Or if I have x0=250 and x1=0 then it would be any graphic bigger then 250.

 

<?php
function sanitizeInput($string) { return ereg_replace("[^0-9]", "", $string); }

$x0 = sanitizeInput($_GET['x0']);
$y0 = sanitizeInput($_GET['y0']);
$x1 = sanitizeInput($_GET['x1']);
$y1 = sanitizeInput($_GET['y1']);
$extList = array();    $extList['gif'] = 'image/gif';    $extList['jpg'] = 'image/jpeg'; $extList['png'] = 'image/png';
$img = null;
$fileList = array();
$handle = opendir('./');
while ( false !== ( $file = readdir($handle) ) ) {
    $file_info = pathinfo($file);
    if (isset($extList[strtolower($file_info['extension'])])) 
    { 
    	$fileList[] = $file; 
    }
}
closedir($handle);
$imageNumber = time() % count($fileList);
$img = './' . $fileList[$imageNumber];
if ($img!=null) {
    $imageInfo = pathinfo($img);
    $contentType = 'Content-type: '.$extList[ $imageInfo['extension'] ];
    header ($contentType);
    readfile($img);
}
?>

[MasterACE14]

use http://au2.php.net/manual/en/function.getimagesize.php

[TexasMd91]

I figured out how to do it.

<?php
function sanitizeInput($string) 
{ 
	return ereg_replace("[^0-9]", "", $string); 
}

$x0 = sanitizeInput($_GET['x0']);
$y0 = sanitizeInput($_GET['y0']);
$x1 = sanitizeInput($_GET['x1']);
$y1 = sanitizeInput($_GET['y1']);

$extList = array();$extList['gif'] = 'image/gif';$extList['jpg'] = 'image/jpeg'; $extList['png'] = 'image/png';
$img = null;
$fileList = array();
$handle = opendir('./');
while ( false !== ( $file = readdir($handle) ) ) 
{
	$file_info = pathinfo($file);
	if (isset($extList[strtolower($file_info['extension'])])) 
	{ 
		$imgSize = getimagesize($file);
		if ((($x0 <= $imgSize[0]) || ($x0 == 0)) && (($y0 <= $imgSize[1]) || ($xy == 0)) && (($x1 >= $imgSize[0]) || ($x1 == 0)) && (($y1 >= $imgSize[1]) || ($y1 == 0)))
		{
			$fileList[] = $file; 
		}
	}
}
closedir($handle);
$imageNumber = time() % count($fileList);
$img = './' . $fileList[$imageNumber];
   
if ($img!=null) 
{
	$imageInfo = pathinfo($img);
	$contentType = 'Content-type: '.$extList[ $imageInfo['extension'] ];
	header ($contentType);
	readfile($img);
}
   
?>

I actually knew about the function getimagesize, I just didn't know how to efficiently apply it to the code.

 

The first time I did it I actually had it check the size of the image after it randomly selected it; if it wasn't correct it would just select a random one again.

Problem is then some 1 could specify $_GETs that would make it false and there wasn't a way to stop the script until it reached the mass exe time.

 

But then I figured out that I need to trim out the wrong sized ones when ever I make the array of images, that way there is no reason to randomize it a second time.

 

Now I can provide error messages when necessary

 

And for the people that want to see it working.

http://dvclan.org/signature/0/0/0/0.png

first two 0s are minimum, last 2 are maximum.