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Easy to use image resizer and resampler

Easy to use image resizer and resampler

<?php 
/** 
* @return Void 
* @param Integer $cp_bigs 
* @param String $picdir 
* @param String $picname 
* @param String/Boolean $copydir 
* @desc Makes a resized and resampled scaled copy into specified directory. Returns false if fails. 
*/ 
function make_res_copy($cp_bigs, $picdir, $picname, $copydir) 
    { 
        //check if file has a jpg (jpeg) extension 
        if(strstr(strtolower($picname), ".jpg") or strstr(strtolower($picname), ".jpeg")) 
        { 
                if(strstr(strtolower($picname), ".jpg") or strstr(strtolower($picname), ".jpeg")) 
                    { 
                        $im  = ImageCreateFromJPEG($picdir . "/" . $picname); 
                    } 
                 
                //get the original image size     
                $size = getImageSize($picdir . "/" . $picname); 
                         
                $dstX = 0; 
                $dstY = 0; 
                $srcX = 0; 
                $srcY = 0; 
                 
                //decide wether picture is horizontally or vertically aligned 
                //-->ofcourse if the picture is rectangular all sides of the 
                //-->copy will be equal 
                if($size[0] < $size[1]) 
                    { 
                        $ratio = $size[1]/$cp_bigs; 
                        $dstW = $size[0] / $ratio; 
                        $dstH = $cp_bigs; 
                    } 
                elseif($size[0] == $size[1]) 
                    {     
                        $dstW = $cp_bigs; 
                        $dstH = $cp_bigs; 
                    } 
                else 
                    { 
                        $ratio = $size[0]/$cp_bigs; 
                        $dstW = $cp_bigs; 
                        $dstH = $size[1] / $ratio; 
                    } 
         
                 
                $srcW = $size[0]; 
                $srcH = $size[1]; 
         
                $imdst = ImageCreateTruecolor($dstW, $dstH); 
                                 
                ImageCopyResampled($imdst, $im, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH); 
                if($copydir) 
                    ImageJPEG($imdst, $copydir . "/" . $picname); 
                else 
                    ImageJPEG($imdst); 

        } 

    } 
?>
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