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    satanas147 at gmail dot com
    16 years ago
    Another add-on to previous php5 class for thumbnail (with a merge of Matt and Zorro's proposals).
    This is dedicated to generate thumbnail on the fly for a webpage using the subclass thumbnail.
    It saves the generated thumb as myimage_tn, in the same directory.
    I'm quite new with php5, so I think this could be optimized, but it seems to work fine.

    <?php
    // Imaging
    class imaging
    {
    // Variables
    private $img_input;
    private     $img_output;
    private     $img_src;
    private     $format;
    private     $quality = 80;
    private     $x_input;
    private     $y_input;
    private     $x_output;
    private     $y_output;
    private     $resize;

    // Set image
    public function set_img($img)
    {
    // Find format
    $ext = strtoupper(pathinfo($img, PATHINFO_EXTENSION));
    // JPEG image
    if(is_file($img) && ($ext == "JPG" OR $ext == "JPEG"))
    {
    $this->format = $ext;
    $this->img_input = ImageCreateFromJPEG($img);
    $this->img_src = $img;
    }
    // PNG image
    elseif(is_file($img) && $ext == "PNG")
    {
    $this->format = $ext;
    $this->img_input = ImageCreateFromPNG($img);
    $this->img_src = $img;
    }
    // GIF image
    elseif(is_file($img) && $ext == "GIF")
    {
    $this->format = $ext;
    $this->img_input = ImageCreateFromGIF($img);
    $this->img_src = $img;
    }
    // Get dimensions
    $this->x_input = imagesx($this->img_input);
    $this->y_input = imagesy($this->img_input);
    }

    // Set maximum image size (pixels)
    public function set_size($max_x = 100,$max_y = 100)
    {
    // Resize
    if($this->x_input > $max_x || $this->y_input > $max_y)
    {
    $a= $max_x / $max_y;
    $b= $this->x_input / $this->y_input;
    if (    $a<$b)
    {
    $this->x_output = $max_x;
    $this->y_output = ($max_x / $this->x_input) * $this->y_input;
    }
    else
    {
    $this->y_output = $max_y;
    $this->x_output = ($max_y / $this->y_input) * $this->x_input;
    }
    // Ready
    $this->resize = TRUE;
    }
    // Don't resize
    else { $this->resize = FALSE; }
    }
    // Set image quality (JPEG only)
    public function set_quality($quality)
    {
    if(    is_int($quality))
    {
    $this->quality = $quality;
    }
    }
    // Save image
    public function save_img($path)
    {
    // Resize
    if($this->resize)
    {
    $this->img_output = ImageCreateTrueColor($this->x_output, $this->y_output);
    ImageCopyResampled($this->img_output, $this->img_input, 0, 0, 0, 0, $this->x_output, $this->y_output, $this->x_input, $this->y_input);
    }
    // Save JPEG
    if($this->format == "JPG" OR $this->format == "JPEG")
    {
    if(    $this->resize) { imageJPEG($this->img_output, $path, $this->quality); }
    else {     copy($this->img_src, $path); }
    }
    // Save PNG
    elseif($this->format == "PNG")
    {
    if(    $this->resize) { imagePNG($this->img_output, $path); }
    else {     copy($this->img_src, $path); }
    }
    // Save GIF
    elseif($this->format == "GIF")
    {
    if(    $this->resize) { imageGIF($this->img_output, $path); }
    else {     copy($this->img_src, $path); }
    }
    }
    // Get width
    public function get_width()
    {
    return     $this->x_input;
    }
    // Get height
    public function get_height()
    {
    return     $this->y_input;
    }
    // Clear image cache
    public function clear_cache()
    {
    @    ImageDestroy($this->img_input);
    @    ImageDestroy($this->img_output);
    }
    }
    class     thumbnail extends imaging {
    private     $image;
    private     $width;
    private     $height;

    function     __construct($image,$width,$height) {
    parent::set_img($image);
    parent::set_quality(80);
    parent::set_size($width,$height);
    $this->thumbnail= pathinfo($image, PATHINFO_DIRNAME).pathinfo($image, PATHINFO_FILENAME).'_tn.'.pathinfo($image, PATHINFO_EXTENSION);
    parent::save_img($this->thumbnail);
    parent::clear_cache();
    }
    function     __toString() {
    return     $this->thumbnail;
    }
    }

    ********
    *     DEMO *
    ********
    $thumb = new thumbnail('./image_dir/sub_dir/myimage.jpg',100,100);
    echo     '<img src=\''.$thumb.'\' alt=\'myimage\' title=\'myimage\'/>';

    ?>

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