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119 lines
6.3 KiB
HTML
119 lines
6.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>输出文件指针处的所有剩余数据</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.fpassthru" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fpassthru</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fpassthru</span> — <span class="dc-title">输出文件指针处的所有剩余数据</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fpassthru-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>fpassthru</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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将给定的文件指针从当前的位置读取到 EOF 并把结果写到输出缓冲区。
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</p>
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<p class="para">
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如果已经向文件写入数据，就必须调用 <span class="function"><a href="rewind.html" class="function">rewind()</a></span>
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来将文件指针指向文件头。
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</p>
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<p class="para">
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如果既不修改文件也不在特定位置检索，只想将文件的内容下载到输出缓冲区，应该使用
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<span class="function"><a href="readfile.html" class="function">readfile()</a></span>，这样可以省去
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<span class="function"><a href="fopen.html" class="function">fopen()</a></span> 调用。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fpassthru-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">handle</code></dt>
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<dd>
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<p class="para">文件指针必须是有效的，必须指向由
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<span class="function"><a href="fopen.html" class="function">fopen()</a></span> 或 <span class="function"><a href="fsockopen.html" class="function">fsockopen()</a></span> 成功打开的文件(并还未由 <span class="function"><a href="fclose.html" class="function">fclose()</a></span> 关闭)。</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.fpassthru-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果发生错误， <span class="function"><strong>fpassthru()</strong></span> 返回 <strong><code>FALSE</code></strong>。否则
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<span class="function"><strong>fpassthru()</strong></span> 返回从 <code class="parameter">handle</code>
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读取并传递到输出的字符数目。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fpassthru-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-2799">
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<p><strong>Example #1 对二进制文件使用 <span class="function"><strong>fpassthru()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// 以二进制格式打开文件<br /></span><span style="color: #0000BB">$name </span><span style="color: #007700">= </span><span style="color: #DD0000">'./img/ok.png'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$name</span><span style="color: #007700">, </span><span style="color: #DD0000">'rb'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 发送合适的报头<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-Type: image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-Length: " </span><span style="color: #007700">. </span><span style="color: #0000BB">filesize</span><span style="color: #007700">(</span><span style="color: #0000BB">$name</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// 发送图片并终止脚本<br /></span><span style="color: #0000BB">fpassthru</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />exit;<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.fpassthru-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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当在 Windows
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系统中将 <span class="function"><strong>fpassthru()</strong></span>
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用于二进制文件，要确保在用
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<span class="function"><a href="fopen.html" class="function">fopen()</a></span>
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打开文件时在 mode 中附加了
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<em>b</em> 来将文件以二进制方式打开。
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</p>
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<p class="para">
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鼓励在处理二进制文件时使用
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<em>b</em>
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标志，即使系统并不需要，这样可以使脚本的移植性更好。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.fpassthru-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="readfile.html" class="function" rel="rdfs-seeAlso">readfile()</a> - 输出文件</span></li>
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<li class="member"><span class="function"><a href="fopen.html" class="function" rel="rdfs-seeAlso">fopen()</a> - 打开文件或者 URL</span></li>
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<li class="member"><span class="function"><a href="popen.html" class="function" rel="rdfs-seeAlso">popen()</a> - 打开进程文件指针</span></li>
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<li class="member"><span class="function"><a href="fsockopen.html" class="function" rel="rdfs-seeAlso">fsockopen()</a> - 打开一个网络连接或者一个Unix套接字连接</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |