After two days of failure, I declared the failure. please help me!

After two days of failure, I announced the failure. please help me !! The following code directly processes the image as a garden with four corners. However, the generated image does not generate a file. you can generate a file to be processed in the specified directory .. After two days, it never works... Please help me .. Thank you! For example run Web site: http://www.xxx.com/pic.php? Gopic = 1234 has been involved for two days. if it fails to be completed, the announcement fails. please help me !!
The following code directly processes the image as a garden with four corners.
However, the generated image does not generate a file. you can generate a file to be processed in the specified directory ..
After two days, it never works... Please help me .. Thank you!
For example run Web site: http://www.xxx.com/pic.php? Gopic00001234.jpg

The pic. php code is as follows:

 class RoundedCorner {  
    private $_r;  
    private $_g;  
    private $_b;  
    private $_image_path;  
    private $_radius;  
      
   function __construct($image_path, $radius, $r = 255, $g = 255, $b = 255) {   
        $this->_image_path = $image_path;  
        $this->_radius = $radius;  
        $this->_r = (int)$r;  
        $this->_g = (int)$g;  
        $this->_b = (int)$b;  
    }  
      
    private function _get_lt_rounder_corner() {  
        $radius = $this->_radius;  
        $img = imagecreatetruecolor($radius, $radius);  
        $bgcolor = imagecolorallocate($img, $this->_r, $this->_g, $this->_b);  
        $fgcolor = imagecolorallocate($img, 0, 0, 0);  
        imagefill($img, 0, 0, $bgcolor);  
        imagefilledarc($img, $radius, $radius, $radius*2, $radius*2, 180, 270, $fgcolor, IMG_ARC_PIE);  
        imagecolortransparent($img, $fgcolor);  
        return $img;  
    }  
      
    private function _load_source_image() {  
        $ext = substr($this->_image_path, strrpos($this->_image_path, '.'));  
        if (empty($ext)) {  
            return false;