]>
* 1、自动验证文件是表单提交的文件还是base64流提交的文件
* 2、验证图片类型是否合法
* 3、验证图片尺寸是否合法
* 4、验证图片大小是否合法
* 5、支持获取图片信息功能
* 6、支持缩放功能
* 7、支持裁剪功能
* 8、支持缩略图功能
*/
class image{
private $file;
private $type;
public $suffix = array();
public $measure = array();
public $size = array();
public $scale = array(
        'is_scale'=>0,
        'ratio'=>1
    );
public $crop = array(
        'is_crop'=>0,
        'width'=>0,
        'height'=>0
    );
public $thumb = array(
        'is_thumb'=>0,
        'width'=>0,
        'height'=>0
    );
public function __construct($file){
    $this->file = $file;
    $this->getType();
}
/*
 内部方法：获取图片类型
 1、多文件
 2、单文件
 3、base64流文件
 */
private function getType(){
    $file = $this->file;
    if(is_array($file)){
        // 多文件
        if(is_array($file['name'])){
            $type = 1;
        }else{  // 单文件
            $type = 2;
        }
    }else{
        $type = 3;
    }
    $this->type = $type;
}
/*
 内部方法：获取图片后缀
 @param path 图片路径
 @return suffix 后缀名 如：jpg
 */
private function getSuffix($path) {
    $file = fopen($path, "rb");
    $bin = fread($file, 2); // 只读2字节
    fclose($file);
    $strInfo = @unpack("C2chars", $bin);
    $typeCode = intval($strInfo['chars1'] . $strInfo['chars2']);
    $suffix = "unknow";
    if($typeCode == 255216){
        $suffix = "jpg";
    }elseif($typeCode == 7173){
        $suffix = "gif";
    }elseif($typeCode == 13780){
        $suffix = "png";
    }elseif($typeCode == 6677){
        $suffix = "bmp";
    }elseif($typeCode == 7798){
        $suffix = "exe";
    }elseif($typeCode == 7784){
        $suffix = "midi";
    }elseif($typeCode == 8297){
        $suffix = "rar";
    }elseif($typeCode == 7368){
        $suffix = "mp3";
    }elseif($typeCode == 0){
        $suffix = "mp4";
    }elseif($typeCode == 8273){
        $suffix = "wav";
    }
    return $suffix;
}
/*
 内部方法：保存流文件
 @param stream 文件流
 @param suffix 后缀
 @param dir 保存文件夹
 @return path 文件路径
 */
private function uploadBase64($stream,$suffix,$dir) {
    if (empty($stream)) return false;
    if (preg_match('/^(data:(\s)?(image|img)\/(\w+);base64,)/', $stream, $str)) {
        $path = $dir . md5(rand(100000, 999999)) . ".{$suffix}";
        if (file_put_contents($path, base64_decode(str_replace($str[1], '', $stream)))) {
            return $path;
        } else {
            return false;
        }
    } else {
        return false;
    }
}
/*
 校验文件类型是否合法
 @return ret true:合法 false:非法
 */
public function checkType(){
    $file = $this->file;
    $type = $this->type;
    $validSuffix = $this->suffix;
    $ret = true;
    if($type==1){   // 多文件
        foreach($file['tmp_name'] as $v){
            $suffix = $this->getSuffix($v);
            if(!in_array($suffix,$validSuffix)){
                $ret = false;
                break;
            }
        }
    }elseif($type==2){  // 单文件
        $suffix = $this->getSuffix($file['tmp_name']);
        if(!in_array($suffix,$validSuffix)){
            $ret = false;
        }
    }else{  // base64文件
        $suffix = $this->getSuffix($file);
        if(!in_array($suffix,$validSuffix)){
            $ret = false;
        }
    }
    return $ret;
}
/*
 校验文件尺寸是否合法
 @return ret true:合法 false:非法
 */
public function checkMeasure(){
    $file = $this->file;
    $type = $this->type;
    $validMeasure = $this->measure;
    $ret = true;
    if($type==1){   // 多文件
        foreach($file['tmp_name'] as $v){
            $measure = getimagesize($v);
            $width = $measure[0];
            $height = $measure[1];
            if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
                $ret = false;
                break;
            }
        }
    }elseif($type==2){  // 单文件
        $measure = getimagesize($file['tmp_name']);
        $width = $measure[0];
        $height = $measure[1];
        if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
            $ret = false;
        }
    }else{  // base64文件
        $measure = getimagesize($file);
        $width = $measure[0];
        $height = $measure[1];
        if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
            $ret = false;
        }
    }
    return $ret;
}
/*
 校验文件大小是否合法
 @return ret true:合法 false:非法
 */
public function checkSize(){
    $file = $this->file;
    $type = $this->type;
    $validSize = $this->size;
    $ret = true;
    if($type==1){   // 多文件
        foreach($file['tmp_name'] as $v){
            $size = filesize($v);
            if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
                $ret = false;
                break;
            }
        }
    }elseif($type==2){  // 单文件
        $size = filesize($file['tmp_name']);
        if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
            $ret = false;
        }
    }else{  // base64文件
        $info = file_get_contents($file);
        $size = strlen($info);
        if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
            $ret = false;
        }
    }
    return $ret;
}
/*
 @desc：获取图片信息
 */
public function info(){
    $file = $this->file;
    $type = $this->type;
    $ret = array();
    if($type==1){   // 多文件
        foreach($file['tmp_name'] as $k=>$v){
            $measure = getimagesize($v);
            $width = $measure[0];
            $height = $measure[1];
            $size = filesize($v)/1024/1024;
            $ret[$k] = array(
                    'width'=>$width,
                    'height'=>$height,
                    'size'=>number_format($size,2)
                );
        }
    }elseif($type==2){  // 单文件
        $measure = getimagesize($file['tmp_name']);
        $width = $measure[0];
        $height = $measure[1];
        $size = filesize($file['tmp_name'])/1024/1024;
        $ret = array(
                'width'=>$width,
                'height'=>$height,
                'size'=>number_format($size,2)
            );
    }else{  // base64文件
        $measure = getimagesize($file);
        $width = $measure[0];
        $height = $measure[1];
        $info = file_get_contents($file);
        $size = strlen($info)/1024/1024;
        $ret = array(
                'width'=>$width,
                'height'=>$height,
                'size'=>number_format($size,2)
            );
    }
    return $ret;
}
/*
 内部方法：缩放图片
 */
private function scale($path,$suffix,$ratio){
    list($width, $height) = getimagesize($path);  
    $new_w = $ratio * $width;
    $new_h = $ratio * $height;
    $new_s = imagecreatetruecolor($new_w, $new_h);
    if(in_array($suffix,array('jpg','jpeg'))){
        $img = imagecreatefromjpeg($path);
    }elseif($suffix == 'png'){
        $img = imagecreatefrompng($path);
    }elseif($suffix == 'gif'){
        $img = imagecreatefromgif($path);
    }else{
        return false;
    }
    $ret1 = imagecopyresized($new_s, $img, 0, 0, 0, 0, $new_w, $new_h, $width, $height);  
    if(in_array($suffix,array('jpg','jpeg'))){
        $ret2 = imagejpeg($new_s, $path);
    }elseif($suffix == 'png'){
        $ret2 = imagepng($new_s, $path);
    }elseif($suffix == 'gif'){
        $ret2 = imagegif($new_s, $path);
    }else{
        return false;
    }
    imagedestroy($new_s);  
    imagedestroy($img);
    if($ret1 && $ret2){
        return $path;
    }else{
        return false;
    }
}
/*
 内部方法：裁剪图片
 */
private function crop($path,$suffix,$cut_width,$cut_height){
    $cut_x;
    $cut_y;
    $min;
    $size = getimagesize($path);
    $width = $size[0];
    $height = $size[1];
    $min = min($width,$height);
    $cut_width = ($cut_width > $min)?$min:$cut_width;
    $cut_height = ($cut_height > $min)?$min:$cut_height;
    $cut_x = ($width - $cut_width) / 2;
    $cut_y = ($height - $cut_height) / 2;
    if(in_array($suffix,array('jpg','jpeg'))){
        $img = imagecreatefromjpeg($path);
    }elseif($suffix == 'png'){
        $img = imagecreatefrompng($path);
    }elseif($suffix == 'gif'){
        $img = imagecreatefromgif($path);
    }else{
        return false;
    }
    $new_s = imagecreatetruecolor($cut_width, $cut_height);
    $ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height);  
    if(in_array($suffix,array('jpg','jpeg'))){
        $ret2 = imagejpeg($new_s, $path);
    }elseif($suffix == 'png'){
        $ret2 = imagepng($new_s, $path);
    }elseif($suffix == 'gif'){
        $ret2 = imagegif($new_s, $path);
    }else{
        return false;
    }
    imagedestroy($new_s);
    imagedestroy($img);
    if($ret1 && $ret2){
        return $path;
    }else{
        return false;
    }
}
/*
 内部方法：生成缩略图
 */
private function thumb($path,$suffix,$cut_width,$cut_height){
    $cut_x;
    $cut_y;
    $ratio = 1;
    $size = getimagesize($path);
    $width = $size[0];
    $height = $size[1];
    $cw;
    $ch;
    if($width/$height >= $cut_width/$cut_height){
        $ratio = $cut_height / $height;
    }else{
        $ratio = $cut_width / $width;
    }
    $path = $this->scale($path,$suffix,$ratio,$path);
    $width *= $ratio;
    $height *= $ratio;
    $cut_x = abs($cut_width - $width) / 2;
    $cut_y = abs($cut_height - $height) / 2;
    if(in_array($suffix,array('jpg','jpeg'))){
        $img = imagecreatefromjpeg($path);
    }elseif($suffix == 'png'){
        $img = imagecreatefrompng($path);
    }elseif($suffix == 'gif'){
        $img = imagecreatefromgif($path);
    }else{
        return false;
    }
    $new_s = imagecreatetruecolor($cut_width, $cut_height);
    $ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height);  
    if(in_array($suffix,array('jpg','jpeg'))){
        $ret2 = imagejpeg($new_s, $path);
    }elseif($suffix == 'png'){
        $ret2 = imagepng($new_s, $path);
    }elseif($suffix == 'gif'){
        $ret2 = imagegif($new_s, $path);
    }else{
        return false;
    }
    imagedestroy($new_s);
    imagedestroy($img);
    if($ret1 && $ret2){
        return $path;
    }else{
        return false;
    }
}
/*
 保存
 @param dir 存储的文件夹 如：'./'
 @return ret 存储的文件路径 如：'./test.jpg'
 */
public function save($dir){
    $file = $this->file;
    $type = $this->type;
    $scale = $this->scale;
    $crop = $this->crop;
    $thumb = $this->thumb;
    $is_scale = $scale['is_scale'];
    $is_crop = $crop['is_crop'];
    $is_thumb = $thumb['is_thumb'];
    $ratio = $scale['ratio'];
    $crop_width = $crop['width'];
    $crop_height = $crop['height'];
    $thumb_width = $thumb['width'];
    $thumb_height = $thumb['height'];
    if($type==1){   // 多文件
        foreach($file['tmp_name'] as $k=>$v){
            $suffix = $this->getSuffix($v);
            $name = $dir.md5(rand(100000,999999)).'.'.$suffix;
            $flag = file_put_contents($name,file_get_contents($v));
            if(!$flag){
                $ret = false;
            }else{
                if($is_scale){
                    $name = $this->scale($name,$suffix,$ratio);
                }
                if($is_crop){
                    $name = $this->crop($name,$suffix,$crop_width,$crop_height);
                }
                if($is_thumb){
                    $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
                }
                $ret[$k] = $name;
            }
        }
    }elseif($type==2){  // 单文件
        $suffix = $this->getSuffix($file['tmp_name']);
        $name = $dir.md5(rand(100000,999999)).'.'.$suffix;
        $flag = file_put_contents($name,file_get_contents($file['tmp_name']));
        if(!$flag){
            $ret = false;
        }else{
            if($is_scale){
                $name = $this->scale($name,$suffix,$ratio);
            }
            if($is_crop){
                $name = $this->crop($name,$suffix,$crop_width,$crop_height);
            }
            if($is_thumb){
                $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
            }
            $ret = $name;
        }
    }else{  // base64文件
        $suffix = $this->getSuffix($file);
        $name = $dir.md5(rand(100000,999999)).'.'.$suffix;
        $flag = file_put_contents($name,file_get_contents($file));
        if(!$flag){
            $ret = false;
        }else{
            if($is_scale){
                $name = $this->scale($name,$suffix,$ratio);
            }
            if($is_crop){
                $name = $this->crop($name,$suffix,$crop_width,$crop_height);
            }
            if($is_thumb){
                $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
            }
            $ret = $name;
        }
    }
    return $ret;
}
}

$file = $_FILES['file'];
$image = new image($file);
$image->thumb = array(
    'is_thumb'=>1,
    'width'=>200,
    'height'=>500
);
$ret = $image->save('./');
var_dump($ret);