php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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