php 上传图片并且存储为jpg格式

  <?php
defined('IN_PHPCMS') or exit('No permission resources.');
pc_base::load_app_class('phpsso', 'phpsso', 0);
pc_base::load_app_class('messagequeue', 'admin' , 0);
pc_base::load_app_func('global', 'admin');

class upp{

private $username, $config;

/**
 * 构造函数
 */
public function __construct() {
    $this->db = pc_base::load_model('member_model');
    pc_base::load_app_func('global');
}

/**
 *  上传头像处理
 *  传入头像压缩包，解压到指定文件夹后删除非图片文件
 */
public function init() {
    $_postbody = file_get_contents('php://input');
    $post_data = json_decode($_postbody, true);
    $post_data = $_POST;
    if ($post_data['user_id']) {
        $typeArr = array("jpg", "png", "gif");//允许上传文件格式 
        $uid = $post_data['user_id'];
        $wwwurl = "http://www.i-ev.com/phpsso_server/";
        $dir1 = ceil($uid / 10000);
        $dir2 = ceil($uid % 10000 / 1000);
        $path = 'uploadfile/avatar/'.$dir1.'/'.$dir2.'/'.$uid.'/';

    
        $name = $_FILES['file']['name']; 
        $size = $_FILES['file']['size']; 
        $name_tmp = $_FILES['file']['tmp_name']; 
        if (empty($name)) { 
            echo json_encode(array("error"=>"您还未选择图片")); 
            exit; 
        } 
        $type = strtolower(substr(strrchr($name, '.'), 1)); //获取文件类型 
         
        if (!in_array($type, $typeArr)) { 
            echo json_encode(array("error"=>"清上传jpg,png或gif类型的图片！")); 
            exit; 
        } 
        if ($size > (500 * 1024)) { 
            echo json_encode(array("error"=>"图片大小已超过500KB！")); 
            exit; 
        } 
        
         
        $pic_name = time() . rand(10000, 99999) . "." . $type;//图片名称 
        //$pic_name = time() . rand(10000, 99999) . ".jpg";//图片名称 
        $pic_url = $path . $pic_name;//上传后图片路径+名称 
        if(!file_exists($path)){
            mkdir($path, 0777, true);
        }
        
        if (move_uploaded_file($name_tmp, $pic_url)) { //临时文件转移到目标文件夹 
            //$img = imagecreatefromgif($pic_url);
            //$pic_url = imagejpeg($img,$toFile.'2222.jpg');
            $this->resize($pic_url,$path,180,180);
            $this->resize($pic_url,$path,90,90);
            $this->resize($pic_url,$path,45,45);
            $this->resize($pic_url,$path,30,30);
            $aa = $this->resize($pic_url,$path,120,120);
            $uppp = $this->db->update(array('avatar'=>'1'), array('uid'=>$post_data['user_id']));
            echo json_encode(array('code'=>'OK','info'=>'成功','data'=>$wwwurl.$path.$aa)); 
        } else { 
            echo json_encode(array('code'=>"321",'info'=>'操作失败')); 
        } 
    }else{
        echo json_encode(array('code'=>"321",'info'=>'操作失败')); 
    }
}
/** 
 * * 
 *等比缩放 
 * @param unknown_type $srcImage   源图片路径 
 * @param unknown_type $toFile     目标图片路径 
 * @param unknown_type $maxWidth   最大宽 
 * @param unknown_type $maxHeight  最大高 
 * @param unknown_type $imgQuality 图片质量 
 * @return unknown 
 */ 
private function resize($srcImage,$toFile,$maxWidth = 100,$maxHeight = 100,$imgQuality=99) 
{ 
   
    list($width, $height, $type, $attr) = getimagesize($srcImage); 
    if($width < $maxWidth  || $height < $maxHeight) return ; 
    switch ($type) { 
    case 1: $img = imagecreatefromgif($srcImage); break; 
    case 2: $img = imagecreatefromjpeg($srcImage); break; 
    case 3: $img = imagecreatefrompng($srcImage); break; 
    }
    
    $scale = min($maxWidth/$width, $maxHeight/$height); //求出绽放比例 
     
    if($scale < 1) { 
    $newWidth = floor($scale*$width); 
    $newHeight = floor($scale*$height); 
    $newImg = imagecreatetruecolor($newWidth, $newHeight); 
    imagecopyresampled($newImg, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height); 
    $newName = $maxWidth.'x'.$maxHeight; 
    $toFile = preg_replace("/(.gif|.jpg|.jpeg|.png)/i","",$toFile); 
 
    switch($type) { 
        case 1: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality)) 
        return "$newName.jpg"; break; 
        case 2: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality)) 
        return "$newName.jpg"; break; 
        case 3: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality)) 
        return "$newName.jpg"; break; 
        default: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
        return "$newName.jpg"; break; 
    } 
    
    imagedestroy($newImg); 
    } 
    imagedestroy($img); 
    return false; 
}

}
?>