PHP实现可添加水印与生成缩略图的图片处理工具类

本文实例讲述了PHP实现可添加水印与生成缩略图的图片处理工具类。分享给大家供大家参考，具体如下：

ImageTool.class.php

<?phpclass ImageTool{  private $imagePath;//图片路径  private $outputDir;//输出文件夹  private $memoryImg;//内存图像  public function __construct($imagePath, $outputDir = null)  {    $this->imagePath = $imagePath;    $this->outputDir = $outputDir;    $this->memoryImg = null;  }  /**   * 显示内存中的图片   * @param $image   */  public function showImage()  {    if ($this->memoryImg != null) {      $info = getimagesize($this->imagePath);      $type = image_type_to_extension($info[2], false);      header('Content-type:' . $info['mime']);      $funs = "image{$type}";      $funs($this->memoryImg);      imagedestroy($this->memoryImg);      $this->memoryImg = null;    }  }  /**将图片以文件形式保存   * @param $image   */  private function saveImage($image)  {    $info = getimagesize($this->imagePath);    $type = image_type_to_extension($info[2], false);    $funs = "image{$type}";    if (empty($this->outputDir)) {      $funs($image, md5($this->imagePath) . '.' . $type);    } else {      $funs($image, $this->outputDir . md5($this->imagePath) . '.' . $type);    }  }  /**   * 压缩图片   * @param $width 压缩后宽度   * @param $height 压缩后高度   * @param bool $output 是否输出文件   * @return resource   */  public function compressImage($width, $height, $output = false)  {    $image = null;    $info = getimagesize($this->imagePath);    $type = image_type_to_extension($info[2], false);    $fun = "imagecreatefrom{$type}";    $image = $fun($this->imagePath);    $thumbnail = imagecreatetruecolor($width, $height);    imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $width, $height, $info[0], $info[1]);    imagedestroy($image);    if ($output) {      $this->saveImage($thumbnail);    }    $this->memoryImg = $thumbnail;    return $this;  }  /**   * 为图像添加文字标记   *   * @param $content 文本内容   * @param $size 字体大小   * @param $font 字体样式   * @param bool $output 是否输出文件   * @return $this   */  public function addTextmark($content, $size, $font, $output = false)  {    $info = getimagesize($this->imagePath);    $type = image_type_to_extension($info[2], false);    $fun = "imagecreatefrom{$type}";    $image = $fun($this->imagePath);    $color = imagecolorallocatealpha($image, 0, 0, 0, 80);    $posX = imagesx($image) - strlen($content) * $size / 2;    $posY = imagesy($image) - $size / 1.5;    imagettftext($image, $size, 0, $posX, $posY, $color, $font, $content);    if ($output) {      $this->saveImage($image);    }    $this->memoryImg = $image;    return $this;  }  /**   * 为图片添加水印   *   * @param $watermark 水印图片路径   * @param $alpha 水印透明度(0-100)   * @param bool $output 是否输出文件   * @return $this   */  public function addWatermark($watermark, $alpha, $output = false)  {    $image_info = getimagesize($this->imagePath);    $image_type = image_type_to_extension($image_info[2], false);    $image_fun = "imagecreatefrom{$image_type}";    $image = $image_fun($this->imagePath);    $mark_info = getimagesize($watermark);    $mark_type = image_type_to_extension($mark_info[2], false);    $mark_fun = "imagecreatefrom{$mark_type}";    $mark = $mark_fun($watermark);    $posX = imagesx($image) - imagesx($mark);    $posY = imagesy($image) - imagesy($mark);    imagecopymerge($image, $mark, $posX, $posY, 0, 0, $mark_info[0], $mark_info[1], $alpha);    if ($output) {      $this->saveImage($image);    }    $this->memoryImg = $image;    return $this;  }}