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94 lines
4.9 KiB
HTML
94 lines
4.9 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>返回文件指针读/写的位置</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.ftell" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">ftell</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">ftell</span> — <span class="dc-title">返回文件指针读/写的位置</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.ftell-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>ftell</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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返回由 <code class="parameter">handle</code> 指定的文件指针的位置，也就是文件流中的偏移量。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.ftell-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">
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文件指针必须是有效的，且必须指向一个通过 <span class="function"><a href="fopen.html" class="function">fopen()</a></span>
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或 <span class="function"><a href="popen.html" class="function">popen()</a></span> 成功打开的文件。在附加模式（加参数 "a" 打开文件）中 <span class="function"><strong>ftell()</strong></span>
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会返回未定义错误。
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</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.ftell-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the position of the file pointer referenced by
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<code class="parameter">handle</code> as an integer; i.e., its offset into the file stream.
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</p>
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<p class="para">
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如果出错，返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.ftell-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-2808">
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<p><strong>Example #1 <span class="function"><strong>ftell()</strong></span> 例子</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">// opens a file and read some data<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: #DD0000">"/etc/passwd"</span><span style="color: #007700">, </span><span style="color: #DD0000">"r"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$data </span><span style="color: #007700">= </span><span style="color: #0000BB">fgets</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">12</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// where are we ?<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">ftell</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">); </span><span style="color: #FF8000">// 11<br /><br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<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 seealso" id="refsect1-function.ftell-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="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="fseek.html" class="function" rel="rdfs-seeAlso">fseek()</a> - 在文件指针中定位</span></li>
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<li class="member"><span class="function"><a href="rewind.html" class="function" rel="rdfs-seeAlso">rewind()</a> - 倒回文件指针的位置</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> |