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PHP使用文件流下载文件方法
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<code class=" hljs ">1、flush — 刷新输出缓冲2、ob_clean — 清空（擦掉）输出缓冲区注：上面2个函数可以解决PHP下载文件内容乱码</code>
DEMO :
<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php </span> <span class="hljs-comment">//fname为要下载的文件名</span> <span class="hljs-comment">//$fpath为下载文件所在文件夹，默认是downlod</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">download</span><span class="hljs-params">(<span class="hljs-variable">$fname</span>,<span class="hljs-variable">$fpath</span>=<span class="hljs-string">"download/"</span>)</span>{</span> <span class="hljs-comment">//避免中文文件名出现检测不到文件名的情况，进行转码utf-8->gbk</span> <span class="hljs-variable">$filename</span>=iconv(<span class="hljs-string">'utf-8'</span>, <span class="hljs-string">'gb2312'</span>, <span class="hljs-variable">$fname</span>); <span class="hljs-variable">$path</span>=<span class="hljs-variable">$fpath</span>.<span class="hljs-variable">$filename</span>; <span class="hljs-keyword">if</span>(!file_exists(<span class="hljs-variable">$path</span>)){<span class="hljs-comment">//检测文件是否存在</span> <span class="hljs-keyword">echo</span> <span class="hljs-string">"文件不存在！"</span>; <span class="hljs-keyword">die</span>(); } <span class="hljs-variable">$fp</span>=fopen(<span class="hljs-variable">$path</span>,<span class="hljs-string">'r'</span>);<span class="hljs-comment">//只读方式打开</span> <span class="hljs-variable">$filesize</span>=filesize(<span class="hljs-variable">$path</span>);<span class="hljs-comment">//文件大小</span> <span class="hljs-comment">//返回的文件(流形式)</span> header(<span class="hljs-string">"Content-type: application/octet-stream"</span>); <span class="hljs-comment">//按照字节大小返回</span> header(<span class="hljs-string">"Accept-Ranges: bytes"</span>); <span class="hljs-comment">//返回文件大小</span> header(<span class="hljs-string">"Accept-Length: $filesize"</span>); <span class="hljs-comment">//这里客户端的弹出对话框，对应的文件名</span> header(<span class="hljs-string">"Content-Disposition: attachment; filename="</span>.<span class="hljs-variable">$filename</span>); <span class="hljs-comment">//================重点====================</span> ob_clean(); flush(); <span class="hljs-comment">//=================重点===================</span> <span class="hljs-comment">//设置分流</span> <span class="hljs-variable">$buffer</span>=<span class="hljs-number">1024</span>; <span class="hljs-comment">//来个文件字节计数器</span> <span class="hljs-variable">$count</span>=<span class="hljs-number">0</span>; <span class="hljs-keyword">while</span>(!feof(<span class="hljs-variable">$fp</span>)&&(<span class="hljs-variable">$filesize</span>-<span class="hljs-variable">$count</span>><span class="hljs-number">0</span>)){ <span class="hljs-variable">$data</span>=fread(<span class="hljs-variable">$fp</span>,<span class="hljs-variable">$buffer</span>); <span class="hljs-variable">$count</span>+=<span class="hljs-variable">$data</span>;<span class="hljs-comment">//计数</span> <span class="hljs-keyword">echo</span> <span class="hljs-variable">$data</span>;<span class="hljs-comment">//传数据给浏览器端</span> } fclose(<span class="hljs-variable">$fp</span>); } download(<span class="hljs-string">"testfile.doc"</span>);<span class="hljs-preprocessor">?></span></span></span></code>