file_get_contents（）的另一种使用方法

$data = file_get_contents("php://input");

<span> <span>php<span>:<span>//<span>input 是个可以访问请求的原始数据的只读流。 POST 请求的情况下，最好使用 php://input 来代替 $HTTP_RAW_POST_DATA，因为它不依赖于特定的 php.ini 指令。 而且，这样的情况下 $HTTP_RAW_POST_DATA 默认没有<span>填充， 比激活 always_populate_raw_post_<span>data 潜在需要更少的内存。 enctype="multipart/form-data" 的时候 php://input 是无效的。 <span>1<span>, <span>php<span>:<span>//<span>input 可以读取http entity body中指定长度的值,由Content-Length指定长度,不管是POST方式或者GET方法提交过来的数据。但是，一般GET方法提交数据 时，http request entity body部分都为空。 <span>2<span>,<span>php<span>:<span>//<span>input 与$HTTP_RAW_POST_DATA读取的数据是一样的，都只读取Content-Type不为multipart/form-data的数据。<span> 学习<span>笔记 <span>1<span>，<span>Coentent<span>-<span>Type<span>仅在取值为<span>application<span>/<span>x<span>-<span>www<span>-<span>data<span>-<span>urlencoded<span>和<span>multipart<span>/<span>form<span>-<span>data<span>两种情况下，<span>PHP<span>才会将<span>http<span>请求数据包中相应的数据填入全局变量<span>$_POST <span>2<span>，<span>PHP<span>不能<span>识别的<span>Content<span>-<span>Type<span>类型的时候，会将<span>http<span>请求包中相应的数据填入变量<span>$HTTP_RAW_POST_DATA <span>3<span>, 只有<span>Coentent<span>-<span>Type<span>为<span>multipart<span>/<span>form<span>-<span><span>data<span>的时候，<span>PHP<span>不会将<span>http<span>请求数据包中的相应数据填入<span>php<span>:<span>//<span>input，否则其它情况都会。填入的长度，由Coentent-Length指定。 <span>4<span>，只有<span>Content<span>-<span>Type<span>为<span>application<span>/<span>x<span>-<span>www<span>-<span>data<span>-<span>urlencoded<span>时，<span>php<span>:<span>//<span>input数据才跟$_POST数据相一致。 <span>5<span>，<span>php<span>:<span>//<span>input数据总是跟$HTTP_RAW_POST_DATA相同，但是php://input比$HTTP_RAW_POST_DATA更凑效，且不需要特殊设置php.ini <span>6<span>，<span>PHP<span>会将<span>PATH<span>字段的<span>query_path<span>部分，填入全局变量<span>$_GET<span>。通常情况下，<span>GET<span>方法提交的<span>http<span>请求，<span>body<span>为空。
 
例子 <span>1<span>.<span>php<span>用<span>file_get_contents<span>(<span>"<span>php://input<span>"<span>)<span>或者<span>$HTTP_RAW_POST_DATA<span>可以接收<span>xml<span>数据
 比如： <span>getXML<span>.<span>php<span>;<span>//<span>接收XML地址<span> <span>php <span>$xmldata<span> = <span>file_get_contents<span>(<span>"<span>php://input<span>"<span>)<span>; <span>$data<span> = <span>(<span>array<span>)<span>simplexml_load_string<span>(<span>$xmldata<span>)<span>; <span>?><span> 这里的<span>$<span>data<span>就是包含<span><span>xml<span>数据的数组，具体<span>php<span>解析<span>xml<span>数据更新详细的方法 <span>sendXML<span>.<span>php<span> <span>php <span>$xml<span> = <span>'<span><xml>xmldata</xml><span>'<span>;<span>//<span>要发送的xml <span>$url<span> = <span>'<span>http://localhost/test/getXML.php<span>'<span>;<span>//<span>接收XML地址 <span>$header<span> = <span>'<span>Content-type: text/xml<span>'<span>;<span>//<span>定义content-type为xml <span>$ch<span> = <span>curl_init<span>(<span>)<span>; <span>//<span>初始化curl <span>curl_setopt<span>(<span>$ch<span>, <span>CURLOPT_URL<span>, <span>$url<span>)<span>;<span>//<span>设置链接 <span>curl_setopt<span>(<span>$ch<span>, <span>CURLOPT_RETURNTRANSFER<span>, <span>1<span>)<span>;<span>//<span>设置是否返回信息 <span>curl_setopt<span>(<span>$ch<span>, <span>CURLOPT_HTTPHEADER<span>, <span>$header<span>)<span>;<span>//<span>设置HTTP头 <span>curl_setopt<span>(<span>$ch<span>, <span>CURLOPT_POST<span>, <span>1<span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>