A coder on CodingForums has provided me with the following code that is meant to resize an image proportionally if it exceeds a width of 425. I'm new to PHP programming, so I don't how to implement it in the code provided at the end of this thread.. Please help.

Code:
<?php
class Image_Batch_Processor {

    private $srcDir;
    private $outDir;
    private $maxWidth;
    private $maxHeight;

    /* -----------------------------------------------------------
     * Class Constructor
      ----------------------------------------------------------- */

    public function __construct($srcDir, $outDir, $maxWidth, $maxHeight) {
        $this->srcDir      = $srcDir;
        $this->outDir      = $outDir;
        $this->maxWidth    = $maxWidth;   
        $this->maxHeight   = $maxHeight;
    }

    /* -----------------------------------------------------------
     * Accessors
      ----------------------------------------------------------- */
    public function setSrcDir($srcDir) {
        $this->srcDir      = $srcDir;
    }
    public function setOutDir($outDir) {
        $this->outDir      = $outDir;
    }
    public function setMaxWidth($maxWidth) {
        $this->maxWidth      = $maxWidth;
    }
    public function setMaxheight($maxHeight) {
        $this->maxHeight      = $maxHeight;
    }
     public function getSrcDir($srcDir) {
        return $this->srcDir;
    }
    public function getOutDir($outDir) {
        return $this->outDir;
    }
    public function getMaxWidth($maxWidth) {
        return $this->maxWidth;
    }
    public function getMaxheight($maxHeight) {
        return $this->maxHeight;
    }
     /* -----------------------------------------------------------
     * Class Methods
      ----------------------------------------------------------- */
    public function resize($imgsArr) {
        foreach($imgsArr as $file) {
        $image = $this->srcDir.$file;    
        $outFile = $this->outDir.$file;

        //get the original image attributes
        $size   = GetImageSize($image);
        $width   = $size[0];
        $height  = $size[1];
        $imageType  = $size[2];

        //scaling factors
        $xRatio = $this->maxWidth / $width;  
        $yRatio = $this->maxHeight / $height;
 
        //calculate the new width and height
        if($width <= $this->maxWidth && $height <= $this->maxHeight) {//image does not need resizing
             $toWidth  = $width;
                $toHeight  = $height;
        }    else if($xRatio * $height < $this->maxHeight)    {
                 $toHeight = round($xRatio * $height);
                $toWidth  = $this->maxWidth;        
        }    else {
                 $toWidth = round($yRatio * $width);
                $toHeight  = $this->maxHeight;
        }
        
        //create the resized image
        //Type of image  1=GIF  2=JPG 3=PNG 4=SWF 5=PSD 6=BMP 7=TIFF(intel byte order) 8=TIFF(motorola byte order) 9=JPC 10=JP2 11=JPX 12=JB2 13=SWC 14=IFF 15=WBMP 16=XBM
        $newImage = ImageCreateTrueColor($toWidth,$toHeight); //create the new image canvas
        switch ($imageType)    {    
            case 1:  //gif file
             $oldImage = ImageCreateFromGif($image);
            break;
 
            case 3:  //png file
             $oldImage = ImageCreateFromPng($image);
            break; 
 
            default: //jpg file
             $oldImage = ImageCreateFromJpeg($image);
            break;      
        }
 
        ImageCopyResampled($newImage,$oldImage,0,0,0,0,$toWidth,$toHeight,$width,$height); //resize the new image
            //output the new resized image
        switch ($imageType)    {    
            case 1:  //gif file
            header('Content-type: image/gif');
            ImageGif($newImage,$outFile);
            break; 
 
            case 3:  //png file
            header('Content-type: image/png');
            ImagePng($newImage,$outFile);
            break; 
 
            default: //jpg file
            header('Content-type: image/jpeg');
            ImageJpeg($newImage,$outFile);  
            break;      
        }
 
          //clean up resources
        ImageDestroy($oldImage);
        ImageDestroy($newImage);
    }  
    }
    
} //end of class
//----------------------------------------------------------

?>
Below is the code on my PHP file that is displaying images from a link in a database:
Code:
echo '<img src = "' . $row['Photo_link'] . '" alt = "" />