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172 lines
7.4 KiB
HTML
172 lines
7.4 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>从文件中格式化输入</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.fscanf" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fscanf</h1>
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<p class="verinfo">(PHP 4 >= 4.0.1, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fscanf</span> — <span class="dc-title">从文件中格式化输入</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fscanf-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>fscanf</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$format</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter reference">&$...</code></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>fscanf()</strong></span> 函数和
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<span class="function"><a href="sscanf.html" class="function">sscanf()</a></span> 相似，但是它从与
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<code class="parameter">handle</code> 关联的文件中接受输入并根据指定的
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<code class="parameter">format</code>（定义于 <span class="function"><a href="sprintf.html" class="function">sprintf()</a></span>
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的文档中）来解释输入。
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</p>
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<p class="para">
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格式字符串中的任何空白会与输入流中的任何空白匹配。这意味着甚至格式字符串中的制表符
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<em>\t</em> 也会与输入流中的一个空格字符匹配。
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</p>
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<p class="para">
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每次调用 <span class="function"><strong>fscanf()</strong></span> 都会从文件中读取一行。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fscanf-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">文件系统指针，是典型地由
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<span class="function"><a href="fopen.html" class="function">fopen()</a></span> 创建的 <span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>(资源)。</p>
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</dd>
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<dt>
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<code class="parameter">format</code></dt>
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<dd>
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<p class="para">
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参数格式是 <span class="function"><a href="sprintf.html" class="function">sprintf()</a></span> 文档中所描述的格式。
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</p>
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</dd>
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<dt>
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<code class="parameter">...</code></dt>
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<dd>
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<p class="para">
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The optional assigned values.
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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.fscanf-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果只给此函数传递了两个参数，解析后的值会被作为数组返回。否则，如果提供了可选参数，此函数将返回被赋值的数目。
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可选参数必须用引用传递。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.fscanf-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>4.3.0</td>
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<td>
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在 PHP 4.3.0 之前，从文件中读入的最大字符数是
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512（或者第一个 \n，看先碰到哪种情况）。从
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PHP 4.3.0 起可以读取任意长的行。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fscanf-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-2804">
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<p><strong>Example #1 <span class="function"><strong>fscanf()</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 />$handle </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"users.txt"</span><span style="color: #007700">, </span><span style="color: #DD0000">"r"</span><span style="color: #007700">);<br />while (</span><span style="color: #0000BB">$userinfo </span><span style="color: #007700">= </span><span style="color: #0000BB">fscanf</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #DD0000">"%s\t%s\t%s\n"</span><span style="color: #007700">)) {<br /> list (</span><span style="color: #0000BB">$name</span><span style="color: #007700">, </span><span style="color: #0000BB">$profession</span><span style="color: #007700">, </span><span style="color: #0000BB">$countrycode</span><span style="color: #007700">) = </span><span style="color: #0000BB">$userinfo</span><span style="color: #007700">;<br /> </span><span style="color: #FF8000">//... do something with the values<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">);<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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<p class="para">
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<div class="example" id="example-2805">
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<p><strong>Example #2 users.txt 的内容</strong></p>
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<div class="example-contents">
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<div class="txtcode"><pre class="txtcode">javier argonaut pe
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hiroshi sculptor jp
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robert slacker us
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luigi florist it</pre>
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</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.fscanf-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="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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<li class="member"><span class="function"><a href="fgetss.html" class="function" rel="rdfs-seeAlso">fgetss()</a> - 从文件指针中读取一行并过滤掉 HTML 标记</span></li>
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<li class="member"><span class="function"><a href="sscanf.html" class="function" rel="rdfs-seeAlso">sscanf()</a> - 根据指定格式解析输入的字符</span></li>
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<li class="member"><span class="function"><a href="printf.html" class="function" rel="rdfs-seeAlso">printf()</a> - 输出格式化字符串</span></li>
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<li class="member"><span class="function"><a href="sprintf.html" class="function" rel="rdfs-seeAlso">sprintf()</a> - Return a formatted string</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> |