php 图片操作类,支持生成缩略图,添加水印,上传缩略图

<?php
/**
* @author wolf
*
*/
class Image {
//类开始
public $originimage = ""; //源图片文件地址
public $imageext = ""; //源图片格式
public $thumbimage = ""; //缩略图文件存放地址
public $thumb_maxwidth = 1440; //缩略图最大宽度
public $thumb_maxheight = 900; //缩略图最大高度
public $watermark_text = ""; //水印文字内容
public $watermark_minwidth = 300; //源图片最小宽度：大于此值时加水印
public $watermark_minheight = 200; //源图片最小高度：大于此值时加水印
public $watermark_fontfile = ""; //字体文件
public $watermark_fontsize = 14; //字体大小
public $watermark_logo = "config/water.png"; //水印LOGO地址
public $watermark_transparent = 20; //水印LOGO不透明度
private $origin_width = 0; //源图片宽度
private $origin_height = 0; //源图片高度
private $imageQuilty = 90; //图片质量
private $tmp_originimage = ""; //临时图片(源图片)
private $tmp_thumbimage = ""; //临时图片(缩略图)
private $tmp_waterimage = ""; //临时图片(水印LOGO)
private $_waterPosition = 2; //1正中间 2右下角
//生成缩略图
public function gen_thumbimage() {
if ($this->originimage == "" || $this->thumbimage == "") {
return 0;
}
$this->get_oriwidthheight ();
if ($this->origin_width < $this->thumb_maxwidth && $this->origin_height < $this->thumb_maxheight) {
$this->thumb_maxwidth = $this->origin_width;
$this->thumb_maxheight = $this->origin_height;
} else {
if ($this->origin_width < $this->origin_height) {
$this->thumb_maxwidth = ($this->thumb_maxheight / $this->origin_height) * $this->origin_width;
} else {
$this->thumb_maxheight = ($this->thumb_maxwidth / $this->origin_width) * $this->origin_height;
}
}
$this->get_imagetype ();
$this->gen_tmpimage_origin ();
$this->gen_tmpimage_thumb ();
if ($this->tmp_originimage == "" || $this->tmp_thumbimage == "") {
return - 1;
}
imagecopyresampled ( $this->tmp_thumbimage, $this->tmp_originimage, 0, 0, 0, 0, $this->thumb_maxwidth, $this->thumb_maxheight, $this->origin_width, $this->origin_height );
switch ($this->imageext) {
case "gif" :
imagegif ( $this->tmp_thumbimage, $this->thumbimage );
return 1;
break;
case "jpg" :
imagejpeg ( $this->tmp_thumbimage, $this->thumbimage, $this->imageQuilty );
return 2;
break;
case "png" :
imagepng ( $this->tmp_thumbimage, $this->thumbimage );
return 3;
break;
default :
return - 2;
break;
}
}
//添加文字水印
public function add_watermark1() {
if ($this->originimage == "" || $this->watermark_text == "" || $this->watermark_fontfile == "") {
return 0;
}
$this->get_oriwidthheight ();
if ($this->origin_width < $this->watermark_minwidth || $this->origin_height < $this->watermark_minheight) {
return 0;
}
$this->get_imagetype ();
$this->gen_tmpimage_origin ();
if ($this->tmp_originimage == "") {
return - 1;
}
$textcolor = imagecolorallocate ( $this->tmp_originimage, 255, 0, 0 );
$angle = 0;
$px = $this->origin_width / 2 - 200;
$py = $this->origin_height / 2 - 10;
imagettftext ( $this->tmp_originimage, $this->watermark_fontsize, $angle, $px, $py, $textcolor, $this->watermark_fontfile, $this->watermark_text );
switch ($this->imageext) {
case "gif" :
imagegif ( $this->tmp_originimage, $this->originimage );
return 1;
break;
case "jpg" :
imagejpeg ( $this->tmp_originimage, $this->originimage, $this->imageQuilty );
return 2;
break;
case "png" :
imagepng ( $this->tmp_originimage, $this->originimage );
return 3;
break;
default :
return - 2;
break;
}
}
//添加LOGO水印
public function add_watermark2() {
if ($this->originimage == "" || $this->watermark_logo == "") {
return 0;
}
$this->get_oriwidthheight ();
if ($this->origin_width < $this->watermark_minwidth || $this->origin_height < $this->watermark_minheight) {
return 0;
}
$this->get_imagetype ();
$this->gen_tmpimage_origin ();
$this->gen_tmpimage_waterlogo ();
if ($this->tmp_originimage == "" || $this->tmp_waterimage == "") {
return - 1;
}
list ( $logo_width, $logo_height ) = getimagesize ( $this->watermark_logo );
//正中间
$waterZb = $this->waterPosition ( $logo_width, $logo_height );
$px = $waterZb ['x'];
$py = $waterZb ['y'];
imagecopymerge ( $this->tmp_originimage, $this->tmp_waterimage, $px, $py, 0, 0, $logo_width, $logo_height, $this->watermark_transparent );
switch ($this->imageext) {
case "gif" :
imagegif ( $this->tmp_originimage, $this->originimage );
return 1;
break;
case "jpg" :
imagejpeg ( $this->tmp_originimage, $this->originimage, $this->imageQuilty );
return 2;
break;
case "png" :
imagepng ( $this->tmp_originimage, $this->originimage );
return 3;
break;
default :
return - 2;
break;
}
}

/**
* 上传缩略图
* 注意上传文件大小限制
*@param String $files $_FILES['upload'] 类型
*@param String  $path  存储的目录 默认在/static/attached/
*@param boolean $isWater 是否添加水印
* @return string $filePath 网页url图片路径
*/
public function upload($files, $path, $isWater) {
if (is_uploaded_file ( $files ['tmp_name'] )) {
$upfile = $files;
$name = $upfile [name];
$type = $upfile [type];
$size = $upfile [size];
$tmp_name = $upfile [tmp_name];
$error = $upfile [error];

if ($size > 1048576) {
return array ('status' => false, 'message' => "$name图片太大超过1MB" );
}

$rs = $this->getImageSize ( $tmp_name );
if (! $rs ['status']) {
$rs ['message'] = $name . $rs ['message'];
return $rs;
}

// 创建文件夹
$save_path = getcwd () . "/static/attached/" . $path . "/";
$save_url = "./static/attached/" . $path . "/";
$ym = date ( "Ym" );
$save_path .= $ym . "/";
$save_url .= $ym . "/";
if (! file_exists ( $save_path )) {
mkdir ( $save_path );
}

if ($error == '0') {
$fileType = substr ( $name, strpos ( $name, "." ) + 1 );
$prefix = $this->getRandPrefix ();
$newName = date ( "YmdHi" ) . $prefix . "." . $fileType;
$filepath = $save_path . $newName;
move_uploaded_file ( $tmp_name, $filepath );

}

if ($isWater) {
$this->water ( $filepath );
}

return array ('status' => true, 'message' => $save_url . $newName );
}
}

/**
* 图片增加水印处理
* @param unknown_type $image
*/
public function water($image) {
$this->watermark_logo = ROOT . $this->watermark_logo;
$this->originimage = $image;
//LOGO水印
$this->add_watermark2 ();
}

/**
*
* 获取随机前缀
*/
private function getRandPrefix() {
$string = "abcdefghijklmnopqrstuvwxyz0123456789";
$prefix = '';
for($i = 0; $i < 4; $i ++) {
$rand = rand ( 0, 33 );
$prefix .= $string {$rand};
}
return $prefix;
}

//检测图片大小
private function getImageSize($image) {
list ( $width, $height, $type, $attr ) = getimagesize ( $image );

if ($type != 2 && $type != 3) {
return array ('status' => false, 'message' => "图片格式不正确,请上传JPG或者PNG图片" . $type );
}
//检测图片大小
if ($width > 1440) {
return array ('status' => false, 'message' => "图片宽度请小于1440px,当前为" . $width . "px" );
}

if ($height > 900) {
return array ('status' => false, 'message' => "图片高度请小于900px,当前为" . $height . "px" );

}
return array ('status' => true );
}

/**
* 生成缩略图
*
* @param String $imagefile 原始文件
* @param String $thumbWidth  缩略图宽度
* @param String $thumbHeight 缩略图高度
* @return String 缩略图url
*/
public function reduceImage($imagefile, $thumbWidth, $thumbHeight, $path = "thumb") {

// 生成缩略图
$dir = date ( "Ym", time () );
$imagefile = ROOT . $imagefile;
$imagefile_s = ROOT . "static/attached/" . $path . "/" . $dir . "/s_" . basename ( $imagefile );
$imagetrans = new Image ();
$imagetrans->originimage = $imagefile;
$imagetrans->thumbimage = $imagefile_s;
$imagetrans->thumb_maxwidth = $thumbWidth;
$imagetrans->thumb_maxheight = $thumbHeight;
$isokid = $imagetrans->gen_thumbimage ();

return "./static/attached/" . $path . "/" . $dir . "/s_" . basename ( $imagefile );

}
/**
* 水印位置
* @param int $logo_width
* @param int $logo_height
* @return 水印坐标
*/
private function waterPosition($logo_width, $logo_height) {
switch ($this->_waterPosition) {
case 1 :
$px = $this->origin_width / 2 - $logo_width / 2;
$py = $this->origin_height / 2 - $logo_height / 2;
break;
case 2 :
$px = $this->origin_width - $logo_width - 10;
$py = $this->origin_height - $logo_height - 10;
break;
default :
$px = $this->origin_width / 2 - $logo_width / 2;
$py = $this->origin_height / 2 - $logo_height / 2;
break;
}

return array ('x' => $px, 'y' => $py );
}
//获取图片尺寸
private function get_oriwidthheight() {
list ( $this->origin_width, $this->origin_height ) = getimagesize ( $this->originimage );
return 1;
}
/*
* 检测图片格式
* 原方法需要开启exif 扩展
*/
private function get_imagetype() {
$ext = $this->getImgext ( $this->originimage );
switch ($ext) {
case 1 :
$this->imageext = "gif";
break;
case 2 :
$this->imageext = "jpg";
break;
case 3 :
$this->imageext = "png";
break;
default :
$this->imageext = "unknown";
break;
}
}
//创建临时图片(源图片)
private function gen_tmpimage_origin() {
$ext = $this->getImgext ( $this->originimage );
switch ($ext) {
case 1 :
$this->tmp_originimage = imagecreatefromgif ( $this->originimage );
$bgcolor = imagecolorallocate ( $this->tmp_originimage, 0, 0, 0 );
$bgcolortrans = imagecolortransparent ( $this->tmp_originimage, $bgcolor );
break;
case 2 :
$this->tmp_originimage = imagecreatefromjpeg ( $this->originimage );
break;
case 3 :
$this->tmp_originimage = imagecreatefrompng ( $this->originimage );
imagesavealpha ( $this->tmp_originimage, true );
break;
default :
$this->tmp_originimage = "";
break;
}
}
//创建临时图片(缩略图)
private function gen_tmpimage_thumb() {
$ext = $this->getImgext ( $this->originimage );
switch ($ext) {
case 1 :
$this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight );
$bgcolor = imagecolorallocate ( $this->tmp_thumbimage, 255, 255, 255 );
imagefill ( $this->tmp_thumbimage, 0, 0, $bgcolor );
break;
case 2 :
$this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight );
break;
case 3 :
$this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight );
$bgcolor = imagecolorallocate ( $this->tmp_thumbimage, 255, 255, 255 );
imagefill ( $this->tmp_thumbimage, 0, 0, $bgcolor );
imagealphablending ( $this->tmp_thumbimage, false );
imagesavealpha ( $this->tmp_thumbimage, true );
break;
default :
$this->tmp_thumbimage = "";
break;
}
}
//创建临时图片(LOGO水印)
private function gen_tmpimage_waterlogo() {
$ext = $this->getImgext ( $this->watermark_logo );
switch ($ext) {
case 1 :
$this->tmp_waterimage = imagecreatefromgif ( $this->watermark_logo );
$bgcolor = imagecolorallocate ( $this->tmp_waterimage, 0, 0, 0 );
$bgcolortrans = imagecolortransparent ( $this->tmp_waterimage, $bgcolor );
break;
case 2 :
$this->tmp_waterimage = imagecreatefromjpeg ( $this->watermark_logo );
break;
case 3 :
$this->tmp_waterimage = imagecreatefrompng ( $this->watermark_logo );
imagesavealpha ( $this->tmp_waterimage, true );
break;
default :
$this->tmp_waterimage = "";
break;
}
}
/*
* 获取后缀名
*/
public function getImgext($filename) {
return exif_imagetype ( $filename );
}
//释放资源
public function __destruct() {
if (is_object ( $this->tmp_originimage ) == true) {
imagedestroy ( $this->tmp_originimage );
}
if (is_object ( $this->tmp_thumbimage ) == true) {
imagedestroy ( $this->tmp_thumbimage );
}
if (is_object ( $this->tmp_waterimage ) == true) {
imagedestroy ( $this->tmp_waterimage );
}
}
}