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83 lines
2.8 KiB
HTML
83 lines
2.8 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>Truncates file descriptor fd to offset bytes</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.dio-truncate" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dio_truncate</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)</p><p class="refpurpose"><span class="refname">dio_truncate</span> — <span class="dc-title">
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Truncates file descriptor fd to offset bytes
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dio-truncate-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>dio_truncate</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$fd</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</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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<span class="function"><strong>dio_truncate()</strong></span> truncates a file to at most
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<code class="parameter">offset</code> bytes in size.
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</p>
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<p class="para">
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If the file previously was larger than this size, the extra data is
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lost. If the file previously was shorter, it is unspecified whether the
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file is left unchanged or is extended. In the latter case the extended
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part reads as zero bytes.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dio-truncate-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">fd</code></dt>
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<dd>
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<p class="para">
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The file descriptor returned by <span class="function"><a href="dio_open.html" class="function">dio_open()</a></span>.
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</p>
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</dd>
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<dt>
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<code class="parameter">offset</code></dt>
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<dd>
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<p class="para">
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The offset in bytes.
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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.dio-truncate-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 notes" id="refsect1-function.dio-truncate-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">此函数未在 Windows 平台下实现。</span></p></blockquote>
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</div>
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</div></div></div></body></html> |