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125 lines
5.1 KiB
HTML
125 lines
5.1 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>Seek on a gz-file pointer</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.gzseek" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gzseek</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gzseek</span> — <span class="dc-title">Seek on a gz-file pointer</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gzseek-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>gzseek</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$zp</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$whence</code><span class="initializer"> = SEEK_SET</span></span>
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] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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Sets the file position indicator for the given file pointer to the
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given offset byte into the file stream. Equivalent to calling (in C)
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<em>gzseek(zp, offset, SEEK_SET)</em>.
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</p>
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<p class="para">
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If the file is opened for reading, this function is emulated but
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can be extremely slow. If the file is opened for writing, only
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forward seeks are supported; <span class="function"><strong>gzseek()</strong></span> then compresses
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a sequence of zeroes up to the new starting position.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gzseek-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">zp</code></dt>
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<dd>
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<p class="para">
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The gz-file pointer. It must be valid, and must point to a file
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successfully opened by <span class="function"><a href="gzopen.html" class="function">gzopen()</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 seeked offset.
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</p>
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</dd>
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<dt>
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<code class="parameter">whence</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">whence</code> values are:
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<ul class="simplelist">
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<li class="member"><strong><code>SEEK_SET</code></strong> - Set position equal to <code class="parameter">offset</code> bytes.</li>
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<li class="member"><strong><code>SEEK_CUR</code></strong> - Set position to current location plus <code class="parameter">offset</code>.</li>
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</ul>
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</p>
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<p class="para">
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If <code class="parameter">whence</code> is not specified, it is assumed to be
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<strong><code>SEEK_SET</code></strong>.
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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.gzseek-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Upon success, returns 0; otherwise, returns -1. Note that seeking
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past EOF is not considered an error.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.gzseek-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-881">
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<p><strong>Example #1 <span class="function"><strong>gzseek()</strong></span> 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 />$gz </span><span style="color: #007700">= </span><span style="color: #0000BB">gzopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'somefile.gz'</span><span style="color: #007700">, </span><span style="color: #DD0000">'r'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">gzseek</span><span style="color: #007700">(</span><span style="color: #0000BB">$gz</span><span style="color: #007700">,</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">gzgetc</span><span style="color: #007700">(</span><span style="color: #0000BB">$gz</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">gzclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$gz</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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</div>
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<div class="refsect1 seealso" id="refsect1-function.gzseek-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="gztell.html" class="function" rel="rdfs-seeAlso">gztell()</a> - Tell gz-file pointer read/write position</span></li>
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<li class="member"><span class="function"><a href="gzrewind.html" class="function" rel="rdfs-seeAlso">gzrewind()</a> - Rewind the position of a gz-file pointer</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> |