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PHP quesiton - need to adjust createthumb() function to scale / resize based on width

Posted on 2009-07-07
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Last Modified: 2013-12-13
I need to modify a PHP script so that the generated thumbnail images are scaled / resized based on the width (see attached script).

I normally call the function as follows:

createthumb($filePath,$thumbnail,165,165);

However, .. what ends up happening is that when I upload images that are in portrait rather than landscape mode -- the generated thumbnails are scaled based on the height -- meaning that the height is 165px, .. and the width is scaled proportionally relative to that. In need to somehow update the script so that it does the opposite -- where the height scales relative to the forced 165px width.  Please advise on how I might accomplish this.

Thanks,
- Yvan




<?php 
$imagefolder='.';
$thumbsfolder='.';
$pics=directory($imagefolder,"jpg,JPG,JPEG,jpeg,png,PNG");
$pics=ditchtn($pics,"tn_");
if ($pics[0]!="")
{
	foreach ($pics as $p)
	{
		createthumb($p,"tn_".$p,150,150);
	}
}
 
/*
	Function ditchtn($arr,$thumbname)
	filters out thumbnails
*/
function ditchtn($arr,$thumbname)
{
	foreach ($arr as $item)
	{
		if (!preg_match("/^".$thumbname."/",$item)){$tmparr[]=$item;}
	}
	return $tmparr;
}
 
/*
	Function createthumb($name,$filename,$new_w,$new_h)
	creates a resized image
	variables:
	$name		Original filename
	$filename	Filename of the resized image
	$new_w		width of resized image
	$new_h		height of resized image
*/	
function createthumb($name,$filename,$new_w,$new_h)
{
	$system=explode(".",$name);
	if (preg_match("/jpg|jpeg/",$system[1])){$src_img=imagecreatefromjpeg($name);}
	if (preg_match("/png/",$system[1])){$src_img=imagecreatefrompng($name);}
	$old_x=imageSX($src_img);
	$old_y=imageSY($src_img);
	if ($old_x > $old_y) 
	{
		$thumb_w=$new_w;
		$thumb_h=$old_y*($new_h/$old_x);
	}
	if ($old_x < $old_y) 
	{
		$thumb_w=$old_x*($new_w/$old_y);
		$thumb_h=$new_h;
	}
	if ($old_x == $old_y) 
	{
		$thumb_w=$new_w;
		$thumb_h=$new_h;
	}
	$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
	imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 
	if (preg_match("/png/",$system[1]))
	{
		imagepng($dst_img,$filename); 
	} else {
		imagejpeg($dst_img,$filename); 
	}
	imagedestroy($dst_img); 
	imagedestroy($src_img); 
}
 
/*
        Function directory($directory,$filters)
        reads the content of $directory, takes the files that apply to $filter 
		and returns an array of the filenames.
        You can specify which files to read, for example
        $files = directory(".","jpg,gif");
                gets all jpg and gif files in this directory.
        $files = directory(".","all");
                gets all files.
*/
function directory($dir,$filters)
{
	$handle=opendir($dir);
	$files=array();
	if ($filters == "all"){while(($file = readdir($handle))!==false){$files[] = $file;}}
	if ($filters != "all")
	{
		$filters=explode(",",$filters);
		while (($file = readdir($handle))!==false)
		{
			for ($f=0;$f<sizeof($filters);$f++):
				$system=explode(".",$file);
				if ($system[1] == $filters[$f]){$files[] = $file;}
			endfor;
		}
	}
	closedir($handle);
	return $files;
}
?>

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Question by:egoselfaxis
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2 Comments
 
LVL 10

Accepted Solution

by:
Chad Smith earned 2000 total points
ID: 24797669

<?php 
$imagefolder='.';
$thumbsfolder='.';
$pics=directory($imagefolder,"jpg,JPG,JPEG,jpeg,png,PNG");
$pics=ditchtn($pics,"tn_");
if ($pics[0]!="")
{
        foreach ($pics as $p)
        {
                createthumb($p,"tn_".$p,150,150);
        }
}
 
/*
        Function ditchtn($arr,$thumbname)
        filters out thumbnails
*/
function ditchtn($arr,$thumbname)
{
        foreach ($arr as $item)
        {
                if (!preg_match("/^".$thumbname."/",$item)){$tmparr[]=$item;}
        }
        return $tmparr;
}
 
/*
        Function createthumb($name,$filename,$new_w,$new_h)
        creates a resized image
        variables:
        $name           Original filename
        $filename       Filename of the resized image
        $new_w          width of resized image
        $new_h          height of resized image
*/      
function createthumb($name,$filename,$new_w,$new_h)
{
        $system=explode(".",$name);
        if (preg_match("/jpg|jpeg/",$system[1])){$src_img=imagecreatefromjpeg($name);}
        if (preg_match("/png/",$system[1])){$src_img=imagecreatefrompng($name);}
        $old_x=imageSX($src_img);
        $old_y=imageSY($src_img);
        if ($old_x == $old_y) 
        {
                $thumb_w=$new_w;
                $thumb_h=$new_h;
        }
	else 
	{
                $thumb_w=$new_w;
                $thumb_h=$old_y*($new_h/$old_x);
	}
        $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
        imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 
        if (preg_match("/png/",$system[1]))
        {
                imagepng($dst_img,$filename); 
        } else {
                imagejpeg($dst_img,$filename); 
        }
        imagedestroy($dst_img); 
        imagedestroy($src_img); 
}
 
/*
        Function directory($directory,$filters)
        reads the content of $directory, takes the files that apply to $filter 
                and returns an array of the filenames.
        You can specify which files to read, for example
        $files = directory(".","jpg,gif");
                gets all jpg and gif files in this directory.
        $files = directory(".","all");
                gets all files.
*/
function directory($dir,$filters)
{
        $handle=opendir($dir);
        $files=array();
        if ($filters == "all"){while(($file = readdir($handle))!==false){$files[] = $file;}}
        if ($filters != "all")
        {
                $filters=explode(",",$filters);
                while (($file = readdir($handle))!==false)
                {
                        for ($f=0;$f<sizeof($filters);$f++):
                                $system=explode(".",$file);
                                if ($system[1] == $filters[$f]){$files[] = $file;}
                        endfor;
                }
        }
        closedir($handle);
        return $files;
}
?>

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Author Comment

by:egoselfaxis
ID: 24797776
Works great!  Thanks!

- yg
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