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149 lines
7.5 KiB
HTML
149 lines
7.5 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>读取资源流到一个字符串</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.stream-get-contents" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">stream_get_contents</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">stream_get_contents</span> — <span class="dc-title">读取资源流到一个字符串</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.stream-get-contents-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>stream_get_contents</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$maxlength</code><span class="initializer"> = -1</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = -1</span></span>
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]] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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与 <span class="function"><a href="file_get_contents.html" class="function">file_get_contents()</a></span> 一样，但是
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<span class="function"><strong>stream_get_contents()</strong></span> 是对一个已经打开的资源流进行操作，并将其内容写入一个字符串返回。
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返回的内容取决于 <code class="parameter">maxlength</code> 字节长度和 <code class="parameter">offset</code> 指定的起始位置。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.stream-get-contents-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> (<span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>)</dt>
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<dd>
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<p class="para">
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一个资源流（例如 <span class="function"><a href="fopen.html" class="function">fopen()</a></span> 操作之后返回的结果）
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</p>
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</dd>
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<dt>
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<code class="parameter">maxlength</code> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)</dt>
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<dd>
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<p class="para">
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需要读取的最大的字节数。默认是-1（读取全部的缓冲数据）。
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</p>
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</dd>
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<dt>
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<code class="parameter">offset</code> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)</dt>
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<dd>
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<p class="para">
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在读取数据之前先查找指定的偏移量。如果这个数字是负数，就不进行查找，直接从当前位置开始读取。
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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.stream-get-contents-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回一个字符串 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 changelog" id="refsect1-function.stream-get-contents-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>5.1.0</td>
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<td>
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增加参数 <code class="parameter">offset</code> 。
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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.stream-get-contents-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-4823">
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<p><strong>Example #1 <span class="function"><strong>stream_get_contents()</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 /><br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">$stream </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'http://www.example.com'</span><span style="color: #007700">, </span><span style="color: #DD0000">'r'</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// print all the page starting at the offset 10<br /> </span><span style="color: #007700">echo </span><span style="color: #0000BB">stream_get_contents</span><span style="color: #007700">(</span><span style="color: #0000BB">$stream</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$stream</span><span style="color: #007700">);<br />}<br /><br /><br />if (</span><span style="color: #0000BB">$stream </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'http://www.example.net'</span><span style="color: #007700">, </span><span style="color: #DD0000">'r'</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// print the first 5 bytes<br /> </span><span style="color: #007700">echo </span><span style="color: #0000BB">stream_get_contents</span><span style="color: #007700">(</span><span style="color: #0000BB">$stream</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$stream</span><span style="color: #007700">);<br />}<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.stream-get-contents-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.stream-get-contents-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="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="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="fpassthru.html" class="function" rel="rdfs-seeAlso">fpassthru()</a> - 输出文件指针处的所有剩余数据</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> |