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PHP class to generate thumbnails

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PHP class to generate thumbnails

<?php
//功能:生成缩略图
class CreatMiniature
{
//公共变量
  var $srcFile = ""; //原图
  var $echoType; //输出图片类型，link--不保存为文件；file--保存为文件
  var $im = ""; //临时变量
  var $srcW = ""; //原图宽
  var $srcH = ""; //原图高
//设置变量及初始化
  function SetVar($srcFile, $echoType)
  {
    if (!file_exists($srcFile)) {
      echo '源图片文件不存在!';
      exit();
    }
    $this->srcFile = $srcFile;
    $this->echoType = $echoType;
    $info = "";
    $data = GetImageSize($this->srcFile, $info);
    switch ($data[2]) {
      case 1:
        if (!function_exists("imagecreatefromgif")) {
          echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！返回";
          exit();
        }

Generate thumbnail function (supports image formats: gif, jpeg, png and bmp)

* @author ruxing.li

* @param string $src Source image path

* @param int $width Thumbnail width (conformal scaling is performed when only the height is specified)

* @param int $width Thumbnail height (conformal scaling is performed when only the width is specified)

* @param string $filename Save path (directly output to the browser if not specified)

* @return bool

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