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HomeBackend DevelopmentPHP Tutorialphp实现手机拍照上传头像功能

现在手机拍照很火,那么PHP中如何使用手机拍照并上传头像呢?

原因很简单,就是数据传递,首先手机传递照片信息,这个就不是post传递 
也不是get函数传递,这个另外一种数据格式传递,使用的是$GLOBALS 
['HTTP_RAW_POST_DATA'],这个系统函数跟post很相似,但是$GLOBALS 
['HTTP_RAW_POST_DATA']支持的数据格式更丰富些,详细的区别请自己百度谷歌。
设计流程就是:
    $GLOBALS ['HTTP_RAW_POST_DATA']传递照片数据流(二进制)-->打开一张空白图--->把数据流写进空白图片里面--判断是否是有效图片---完成。
注意传递照片的二进制流已经包含照片的尺寸大小,格式等等属性,时间上就是把手机图片信息传递到web端页面。

    手机端一般使用flash切割照片大小,大家都知道图片和视频是由二进制流组成的,既然图片可以上传,那么视频能不能上传呢?原理是不是和手机拍照上传头像一样呢?自己可以去研究一下

直接上代码

/* 

* 上传图片类 

* @parameter; 用户ID 

* @date:2011-8-15 

* @author:cy 

* */  

function UpImg($subdir){  

// 设置存储路径   

if(!emptyempty($subdir)){  

$dirnow=getcwd();  

$folder =$dirnow."/cover/".$subdir;// folder where to save images   

if( !is_dir($folder) )    mkdir($folder);  



// 图片命名   

$datenow=date('Ymd');  

$timenow=time();  

$image = $datenow.$timenow.'.jpg';  



// 图片是否已存在   

$check = $folder . '/' . $image;  

if (file_exists($check)) {  

    unlink($check);  

} else {  

    $png = file_get_contents ( 'php://input' ) ? file_get_contents ( 'php://input' ) : gzuncompress ( $GLOBALS ['HTTP_RAW_POST_DATA'] );//得到post过来的二进制原始数据   

    if(!emptyempty($png)){  

        $file = @fopen($folder."/".$image, "w");   

        fwrite($file,$png);//写入    

        fclose($file);//关闭    

        // orignal image location   

         $write_image = $folder . '/' . $image;  

      

    }else{  

        $msg = "没有数据流";  

    }     

    if(getimageInfo($write_image)){  

            $msg = "上传成功";  

        }else{$msg = "图片格式不正确";}  

}    

}else{  

$msg = "参数错误";  

}  

return $msg;  

}  



/* 

* 检测图片是否合法 

* @parameter; 文件名 

* @date:2011-8-15 

* @author:cy 

* */  

function getimageInfo($imageName = '') {    

$imageInfo = getimagesize ( $imageName );    

if ($imageInfo !== false) {    

    $imageType = strtolower ( substr ( image_type_to_extension ( $imageInfo [2] ), 1 ) );    

//            $imageSize = filesize ( $imageInfo );     

    return $info = array ('width' => $imageInfo [0], 'height' => $imageInfo [1], 'type' => $imageType, 'mine' => $imageInfo ['mine'] );    

} else {    

    //不是合法的图片     

    return false;    

}    


}

在使用xml-rpc的时候,server端获取client数据,主要是通过php输入流input,而不是$_POST数组  

所以根据上面几个探测,我们可以作出以下总结:
1,Content-Type取值为application/x-www-form-urlencoded时,php会将http请求body相应数据会
填入到数组$_POST,填入到$_POST数组中的数据是进行urldecode()解析的结果。(其实,除了该Content-Type,还有
multipart/form-data表示数据是表单数据,稍后我们介绍)   
2,php://input数据,只要Content-Type不为multipart/form-data(该条件限制稍后会介绍)。那么php:
//input数据与http entity body部分数据是一致的。该部分相一致的数据的长度由Content-Length指定。
3,仅当Content-Type为application/x-www-form-urlencoded且提交方法是POST方法时,$_POST数据
与php://input数据才是”一致”(打上引号,表示它们格式不一致,内容一致)的。其它情况,它们都不一致。
    4,php://input读取不到$_GET数据。是因为$_GET数据作为query_path写在http请求头部(header)的PATH字段,而不是写在http请求的body部分。

这也帮助我们理解了,为什么xml_rpc服务端读取数据都是通过file_get_contents(‘php://input’, 
‘r’)。而不是从$_POST中读取,正是因为xml_rpc数据规格是xml,它的Content-Type是text/xml。


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