PHP Create Thumbnail – PHP thumbnail generator

This file help you generate thumbnail for all pictures inside 1 folder, and rename it, can move it to thumbnail folder …
First, we find all files was thumbnail pictures, define by name in that folder:

function hhfindtb($arr,$thumbname)
{
    foreach ($arr as $item)
    {
        if (!preg_match("/^".$thumbname."/",$item)){$tmparr[]=$item;}
    }
    return $tmparr;
}

Then, read the content of directory, filter out all images files, and creatthumb functions:

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;
}
 
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);
}

That’s all, now you can generate thumbnail for all files by:

$imagefolder='.';
$thumbsfolder='.';
$pics=directory($imagefolder,"jpg,JPG,JPEG,jpeg,png,PNG");
$pics=hhfindtb($pics,"thumb_");
if ($pics[0]!="")
{
    foreach ($pics as $p)
    {
        createthumb($p,"thumb_".$p,150,150);
    }
}

You can use another thumbnail function:

function make_thumb($src,$dest,$desired_width)
{
 
    /* read the source image */
    $source_image = imagecreatefromjpeg($src);
    $width = imagesx($source_image);
    $height = imagesy($source_image);
     
    /* find the "desired height" of this thumbnail, relative to the desired width  */
    $desired_height = floor($height*($desired_width/$width));
     
    /* create a new, "virtual" image */
    $virtual_image = imagecreatetruecolor($desired_width,$desired_height);
     
    /* copy source image at a resized size */
    imagecopyresized($virtual_image,$source_image,0,0,0,0,$desired_width,$desired_height,$width,$height);
     
    /* create the physical thumbnail image to its destination */
    imagejpeg($virtual_image,$dest);
}