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
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, 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, 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, false);
$fun = "imagecreatefrom{$type}";
$image = $fun($this->imagePath);
$thumbnail = imagecreatetruecolor($width, $height);
imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $width, $height, $info, $info);
imagedestroy($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, 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, false);
$image_fun = "imagecreatefrom{$image_type}";
$image = $image_fun($this->imagePath);
$mark_info = getimagesize($watermark);
$mark_type = image_type_to_extension($mark_info, 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, $mark_info, $alpha);
if ($output) {
$this->saveImage($image);
}
$this->memoryImg = $image;
return $this;
}
}
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