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99 lines
5.3 KiB
HTML
99 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>倒回文件指针的位置</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.rewind" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">rewind</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">rewind</span> — <span class="dc-title">倒回文件指针的位置</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.rewind-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>rewind</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">bool</span></div>
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<p class="para rdfs-comment">
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将 <code class="parameter">handle</code> 的文件位置指针设为文件流的开头。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果将文件以附加（"a" 或者 "a+"）模式打开，写入文件的任何数据总是会被附加在后面，不管文件指针的位置。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.rewind-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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文件指针必须合法，并且指向由 <span class="function"><a href="fopen.html" class="function">fopen()</a></span>
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成功打开的文件。
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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.rewind-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <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.rewind-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-2842">
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<p><strong>Example #1 <span class="function"><strong>rewind()</strong></span> overwriting example</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">'output.txt'</span><span style="color: #007700">, </span><span style="color: #DD0000">'r+'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #DD0000">'Really long sentence.'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">rewind</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #DD0000">'Foo'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">rewind</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">fread</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #0000BB">filesize</span><span style="color: #007700">(</span><span style="color: #DD0000">'output.txt'</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$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 class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Foolly long sentence.
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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.rewind-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="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="ftell.html" class="function" rel="rdfs-seeAlso">ftell()</a> - 返回文件指针读/写的位置</span></li>
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<li class="member"><span class="function"><a href="fwrite.html" class="function" rel="rdfs-seeAlso">fwrite()</a> - 写入文件（可安全用于二进制文件）</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> |