<?php
$image = new Image();
$image->water('./upload/up_5cf0caca0565b.png','./upload/up_5cf0cb3a61fae.jpg',9);
class Image
{
//路径
protected $path;
//是否启用随机名字
protected $isRandName;
//要保存的图像类型
protected $type;
//通过构造方法对成员属性进行初始化
function __construct($path = './', $isRandName = true, $type = 'png')
{
$this->path = $path;
$this->isRandName = $isRandName;
$this->type = $type;
}
/**
* 对外公开的水印方法
*
* @param [type] $image 原图片
* @param [type] $water 水印图片
* @param [type] $postion 水印图片的位置
* @param integer $tmd 水印图片的透明度
* @param string $prefix 图片的前缀
* @return void
*/
function water($image, $water, $postion, $tmd = 100, $prefix = 'water_')
{
//1、判断这两个图片是否存在
if ((!file_exists($image)) || (!file_exists($water))) {
die('图片资源不存在');
}
//2、得到原图片的宽度和高度以及水印图片的宽带和高度
$imageInfo = self::getImageInfo($image);
$waterInfo = self::getImageInfo($water);
//3、判断水印图片能否贴上来
if (!$this->checkImage($imageInfo, $waterInfo)) {
exit('水印图片太大');
}
//4、打开图片
$imageRes = self::openAnyImage($image);
$waterRes = self::openAnyImage($water);
//5、根据水印图片的位置计算水印图片的坐标
$pos = $this->getPostion($postion, $imageInfo, $waterInfo);
//6、将水印图片贴过来
imagecopymerge($imageRes, $waterRes, $pos['x'], $pos['y'], 0, 0, $waterInfo['width'], $waterInfo['height'], $tmd);
//7、得到要保存图片的文件名
$newName = $this->createNewName($image, $prefix);
//8、得到保存图片的路径,也就是文件的全路径
$newPath = rtrim($this->path, '/') . '/' . $newName;
//9、保存图片
$this->saveImage($imageRes, $newPath);
//10、销毁资源
imagedestroy($imageRes);
imagedestroy($waterRes);
return $newPath;
}
/**
* 保存图像资源函数
*
* @param [type] $imageRes
* @param [type] $newPath
* @return void
*/
protected function saveImage($imageRes, $newPath)
{
//imagepng imagegif imagewbmp
$func = 'image' . $this->type;
//通过变量函数进行保存
$func($imageRes, $newPath);
}
/**
* 得到文件名函数
*
* @param [type] $imagePath
* @param [type] $prefix
* @return void
*/
protected function createNewName($imagePath, $prefix)
{
if ($this->isRandName) {
$name = $prefix . uniqid() . '.' . $this->type;
} else {
$name = $prefix . pathinfo($imagePath)['filename'] . '.' . $this->type;
}
return $name;
}
/**
* 根据位置计算水印图片的坐标
*
* @param [type] $postion
* @param [type] $imageInfo
* @param [type] $waterInfo
* @return void
*/
protected function getPostion($postion, $imageInfo, $waterInfo)
{
switch ($postion) {
case 1:
$x = 0;
$y = 0;
break;
case 2:
$x = ($imageInfo['width'] - $waterInfo['width']) / 2;
$y = 0;
break;
case 3:
$x = $imageInfo['width'] - $waterInfo['width'];
$y = 0;
break;
case 4:
$x = 0;
$y = ($imageInfo['height'] - $waterInfo['height']) / 2;;
break;
case 5:
$x = ($imageInfo['width'] - $waterInfo['width']) / 2;
$y = ($imageInfo['height'] - $waterInfo['height']) / 2;
break;
case 6:
$x = $imageInfo['width'] - $waterInfo['width'];
$y = ($imageInfo['height'] - $waterInfo['height']) / 2;
break;
case 7:
$x = 0;
$y = $imageInfo['height'] - $waterInfo['height'];
break;
case 8:
$x = ($imageInfo['width'] - $waterInfo['width']) / 2;
$y = $imageInfo['height'] - $waterInfo['height'];
break;
case 9:
$x = $imageInfo['width'] - $waterInfo['width'];
$y = $imageInfo['height'] - $waterInfo['height'];
break;
case 0:
$x = mt_rand(0, ($imageInfo['width'] - $waterInfo['width']));
$y = mt_rand(0, ($imageInfo['height'] - $waterInfo['height']));
break;
}
return ['x' => $x, 'y' => $y];
}
/**
* 判断水印图片是否大于原图片
*
* @param [type] $imageInfo
* @param [type] $waterInfo
* @return void
*/
protected function checkImage($imageInfo, $waterInfo)
{
if (($waterInfo['width'] > $imageInfo['width']) || ($waterInfo['height'] > $imageInfo['height'])) {
return false;
}
return true;
}
/**
* 静态方法,根据图片的路径得到图片信息,宽度、高度、mime类型
*
* @param [type] $imagePath
* @return void
*/
static function getImageInfo($imagePath)
{
//得到图片信息
$info = getimagesize($imagePath);
//保存图片宽度
$data['width'] = $info[0];
//保存图片高度
$data['height'] = $info[1];
//保存图片mime类型
$data['mime'] = $info['mime'];
//将图片信息返回
return $data;
}
/**
* 根据图片类型打开任意图片
*
* @param [type] $imagePath
* @return void
*/
static function openAnyImage($imagePath)
{
//得到图片的mime类型
$mime = self::getImageInfo($imagePath)['mime'];
//根据不同的mime类型来使用不同的函数进行打开图片
switch ($mime) {
case 'image/png':
$image = imagecreatefrompng($imagePath);
break;
case 'image/gif':
$image = imagecreatefromgif($imagePath);
break;
case 'image/jpeg':
$image = imagecreatefromjpeg($imagePath);
break;
case 'image/wbmp':
$image = imagecreatefromwbmp($imagePath);
break;
}
return $image;
}
}