file_get_contents（）的另一种使用方法，filegetcontents
今天在网上看到一篇挺不错的文章，拿过来保存学习一下。本文源地址为：http://www.kuitao8.com/20140727/2867.shtml
$data = file_get_contents("php://input");
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<span class="php-hl-code"> <span class="php-hl-identifier">php<span class="php-hl-code">:<span class="php-hl-comment">//<span class="php-hl-comment">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 $HTTP_RAW_POST_DATA 默认没有<span id="12_nwp">填充， 比激活 always_populate_raw_post_<span id="13_nwp">data 潜在需要更少的内存。 enctype="multipart/form-data" 的时候 php://input 是无效的。
<span class="php-hl-number">1<span class="php-hl-code">, <span class="php-hl-identifier">php<span class="php-hl-code">:<span class="php-hl-comment">//<span class="php-hl-comment">input 可以读取http entity body中指定长度的值,由Content-Length指定长度,不管是POST方式或者GET方法提交过来的数据。但是，一般GET方法提交数据 时，http request entity body部分都为空。
<span class="php-hl-number">2<span class="php-hl-code">,<span class="php-hl-identifier">php<span class="php-hl-code">:<span class="php-hl-comment">//<span class="php-hl-comment">input 与$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 class="php-hl-code">
学习<span id="11_nwp">笔记
<span class="php-hl-number">1<span class="php-hl-code">，<span class="php-hl-identifier">Coentent<span class="php-hl-code">-<span class="php-hl-identifier">Type<span class="php-hl-code">仅在取值为<span class="php-hl-identifier">application<span class="php-hl-code">/<span class="php-hl-identifier">x<span class="php-hl-code">-<span class="php-hl-identifier">www<span class="php-hl-code">-<span class="php-hl-identifier">data<span class="php-hl-code">-<span class="php-hl-identifier">urlencoded<span class="php-hl-code">和<span class="php-hl-identifier">multipart<span class="php-hl-code">/<span class="php-hl-identifier">form<span class="php-hl-code">-<span class="php-hl-identifier">data<span class="php-hl-code">两种情况下，<span class="php-hl-identifier">PHP<span class="php-hl-code">才会将<span class="php-hl-identifier">http<span class="php-hl-code">请求数据包中相应的数据填入全局变量<span class="php-hl-var">$_POST
<span class="php-hl-number">2<span class="php-hl-code">，<span class="php-hl-identifier">PHP<span class="php-hl-code">不能<span id="10_nwp">识别的<span class="php-hl-identifier">Content<span class="php-hl-code">-<span class="php-hl-identifier">Type<span class="php-hl-code">类型的时候，会将<span class="php-hl-identifier">http<span class="php-hl-code">请求包中相应的数据填入变量<span class="php-hl-var">$HTTP_RAW_POST_DATA
<span class="php-hl-number">3<span class="php-hl-code">, 只有<span class="php-hl-identifier">Coentent<span class="php-hl-code">-<span class="php-hl-identifier">Type<span class="php-hl-code">为<span class="php-hl-identifier">multipart<span class="php-hl-code">/<span class="php-hl-identifier">form<span class="php-hl-code">-<span class="php-hl-identifier"><span id="9_nwp">data<span class="php-hl-code">的时候，<span class="php-hl-identifier">PHP<span class="php-hl-code">不会将<span class="php-hl-identifier">http<span class="php-hl-code">请求数据包中的相应数据填入<span class="php-hl-identifier">php<span class="php-hl-code">:<span class="php-hl-comment">//<span class="php-hl-comment">input，否则其它情况都会。填入的长度，由Coentent-Length指定。
<span class="php-hl-number">4<span class="php-hl-code">，只有<span class="php-hl-identifier">Content<span class="php-hl-code">-<span class="php-hl-identifier">Type<span class="php-hl-code">为<span class="php-hl-identifier">application<span class="php-hl-code">/<span class="php-hl-identifier">x<span class="php-hl-code">-<span class="php-hl-identifier">www<span class="php-hl-code">-<span class="php-hl-identifier">data<span class="php-hl-code">-<span class="php-hl-identifier">urlencoded<span class="php-hl-code">时，<span class="php-hl-identifier">php<span class="php-hl-code">:<span class="php-hl-comment">//<span class="php-hl-comment">input数据才跟$_POST数据相一致。
<span class="php-hl-number">5<span class="php-hl-code">，<span class="php-hl-identifier">php<span class="php-hl-code">:<span class="php-hl-comment">//<span class="php-hl-comment">input数据总是跟$HTTP_RAW_POST_DATA相同，但是php://input比$HTTP_RAW_POST_DATA更凑效，且不需要特殊设置php.ini
<span class="php-hl-number">6<span class="php-hl-code">，<span class="php-hl-identifier">PHP<span class="php-hl-code">会将<span class="php-hl-identifier">PATH<span class="php-hl-code">字段的<span class="php-hl-identifier">query_path<span class="php-hl-code">部分，填入全局变量<span class="php-hl-var">$_GET<span class="php-hl-code">。通常情况下，<span class="php-hl-identifier">GET<span class="php-hl-code">方法提交的<span class="php-hl-identifier">http<span class="php-hl-code">请求，<span class="php-hl-identifier">body<span class="php-hl-code">为空。
例子
<span class="php-hl-number">1<span class="php-hl-code">.<span class="php-hl-identifier">php<span class="php-hl-code">用<span class="php-hl-identifier">file_get_contents<span class="php-hl-brackets">(<span class="php-hl-quotes">"<span class="php-hl-string">php://input<span class="php-hl-quotes">"<span class="php-hl-brackets">)<span class="php-hl-code">或者<span class="php-hl-var">$HTTP_RAW_POST_DATA<span class="php-hl-code">可以接收<span class="php-hl-identifier">xml<span class="php-hl-code">数据
比如：
<span class="php-hl-identifier">getXML<span class="php-hl-code">.<span class="php-hl-identifier">php<span class="php-hl-code">;<span class="php-hl-comment">//<span class="php-hl-comment">接收XML地址<span class="php-hl-code">
<?<span class="php-hl-identifier">php
<span class="php-hl-var">$xmldata<span class="php-hl-code"> = <span class="php-hl-identifier">file_get_contents<span class="php-hl-brackets">(<span class="php-hl-quotes">"<span class="php-hl-string">php://input<span class="php-hl-quotes">"<span class="php-hl-brackets">)<span class="php-hl-code">;
<span class="php-hl-var">$data<span class="php-hl-code"> = <span class="php-hl-brackets">(<span class="php-hl-reserved">array<span class="php-hl-brackets">)<span class="php-hl-identifier">simplexml_load_string<span class="php-hl-brackets">(<span class="php-hl-var">$xmldata<span class="php-hl-brackets">)<span class="php-hl-code">;
<span class="php-hl-inlinetags">?><span class="php-hl-code">
这里的<span class="php-hl-var">$<span id="8_nwp">data<span class="php-hl-code">就是包含<span class="php-hl-identifier"><span id="7_nwp">xml<span class="php-hl-code">数据的数组，具体<span class="php-hl-identifier">php<span class="php-hl-code">解析<span class="php-hl-identifier">xml<span class="php-hl-code">数据更新详细的方法
<span class="php-hl-identifier">sendXML<span class="php-hl-code">.<span class="php-hl-identifier">php<span class="php-hl-code">
<?<span class="php-hl-identifier">php
<span class="php-hl-var">$xml<span class="php-hl-code"> = <span class="php-hl-quotes">'<span class="php-hl-string"><xml>xmldata</xml><span class="php-hl-quotes">'<span class="php-hl-code">;<span class="php-hl-comment">//<span class="php-hl-comment">要发送的xml
<span class="php-hl-var">$url<span class="php-hl-code"> = <span class="php-hl-quotes">'<span class="php-hl-string">http://localhost/test/getXML.php<span class="php-hl-quotes">'<span class="php-hl-code">;<span class="php-hl-comment">//<span class="php-hl-comment">接收XML地址
<span class="php-hl-var">$header<span class="php-hl-code"> = <span class="php-hl-quotes">'<span class="php-hl-string">Content-type: text/xml<span class="php-hl-quotes">'<span class="php-hl-code">;<span class="php-hl-comment">//<span class="php-hl-comment">定义content-type为xml
<span class="php-hl-var">$ch<span class="php-hl-code"> = <span class="php-hl-identifier">curl_init<span class="php-hl-brackets">(<span class="php-hl-brackets">)<span class="php-hl-code">; <span class="php-hl-comment">//<span class="php-hl-comment">初始化curl
<span class="php-hl-identifier">curl_setopt<span class="php-hl-brackets">(<span class="php-hl-var">$ch<span class="php-hl-code">, <span class="php-hl-identifier">CURLOPT_URL<span class="php-hl-code">, <span class="php-hl-var">$url<span class="php-hl-brackets">)<span class="php-hl-code">;<span class="php-hl-comment">//<span class="php-hl-comment">设置链接
<span class="php-hl-identifier">curl_setopt<span class="php-hl-brackets">(<span class="php-hl-var">$ch<span class="php-hl-code">, <span class="php-hl-identifier">CURLOPT_RETURNTRANSFER<span class="php-hl-code">, <span class="php-hl-number">1<span class="php-hl-brackets">)<span class="php-hl-code">;<span class="php-hl-comment">//<span class="php-hl-comment">设置是否返回信息
<span class="php-hl-identifier">curl_setopt<span class="php-hl-brackets">(<span class="php-hl-var">$ch<span class="php-hl-code">, <span class="php-hl-identifier">CURLOPT_HTTPHEADER<span class="php-hl-code">, <span class="php-hl-var">$header<span class="php-hl-brackets">)<span class="php-hl-code">;<span class="php-hl-comment">//<span class="php-hl-comment">设置HTTP头
<span class="php-hl-identifier">curl_setopt<span class="php-hl-brackets">(<span class="php-hl-var">$ch<span class="php-hl-code">, <span class="php-hl-identifier">CURLOPT_POST<span class="php-hl-code">, <span class="php-hl-number">1<span class="php-hl-brackets">)<span class="php-hl-code" class="php-hl-comment">;<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></span></span>
