php生成图片缩略图的方法

本文实例讲述了php生成图片缩略图的方法。分享给大家供大家参考。具体如下：

这里需要用到GD2 library

    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, 83);
    }

希望本文所述对大家的php程序设计有所帮助。