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98 lines
5.3 KiB
HTML
98 lines
5.3 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>从文件指针中读取字符</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.fgetc" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fgetc</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fgetc</span> — <span class="dc-title">从文件指针中读取字符</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fgetc-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>fgetc</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">string</span></div>
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<p class="para rdfs-comment">
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从文件句柄中获取一个字符。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fgetc-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.fgetc-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回一个包含有一个字符的字符串，该字符从 <code class="parameter">handle</code> 指向的文件中得到。
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碰到 EOF 则返回 <strong><code>FALSE</code></strong>。
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</p>
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<div class="warning"><strong class="warning">Warning</strong><p class="simpara">此函数可能返回布尔值
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<strong><code>FALSE</code></strong>，但也可能返回等同于 <strong><code>FALSE</code></strong> 的非布尔值。请阅读 <a href="language.types.boolean.html" class="link">布尔类型</a>章节以获取更多信息。应使用
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<a href="language.operators.comparison.html" class="link">===
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运算符</a>来测试此函数的返回值。</p></div>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fgetc-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-2773">
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<p><strong>Example #1 一个 <span class="function"><strong>fgetc()</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 />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'somefile.txt'</span><span style="color: #007700">, </span><span style="color: #DD0000">'r'</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$fp</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'Could not open file somefile.txt'</span><span style="color: #007700">;<br />}<br />while (</span><span style="color: #0000BB">false </span><span style="color: #007700">!== (</span><span style="color: #0000BB">$char </span><span style="color: #007700">= </span><span style="color: #0000BB">fgetc</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">))) {<br /> echo </span><span style="color: #DD0000">"</span><span style="color: #0000BB">$char</span><span style="color: #DD0000">\n"</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 notes" id="refsect1-function.fgetc-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数可安全用于二进制对象。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.fgetc-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="fread.html" class="function" rel="rdfs-seeAlso">fread()</a> - 读取文件（可安全用于二进制文件）</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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<li class="member"><span class="function"><a href="fgets.html" class="function" rel="rdfs-seeAlso">fgets()</a> - 从文件指针中读取一行</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> |