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175 lines
14 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>写入文件（可安全用于二进制文件）</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.fwrite" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fwrite</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fwrite</span> — <span class="dc-title">写入文件（可安全用于二进制文件）</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fwrite-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>fwrite</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code></span>
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] ) : <span class="type">int</span></div>
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<p class="simpara">
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<span class="function"><strong>fwrite()</strong></span> 把 <code class="parameter">string</code> 的内容写入
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文件指针 <code class="parameter">handle</code> 处。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fwrite-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">string</code></dt>
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<dd>
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<p class="para">
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The string that is to be written.
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</p>
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</dd>
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<dt>
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<code class="parameter">length</code></dt>
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<dd>
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<p class="para">
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如果指定了
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<code class="parameter">length</code>，当写入了
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<code class="parameter">length</code> 个字节或者写完了 <code class="parameter">string</code>
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以后，写入就会停止，视乎先碰到哪种情况。
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</p>
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<p class="para">
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注意如果给出了
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<code class="parameter">length</code>
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参数，则 <a href="info.configuration.html#ini.magic-quotes-runtime" class="link">magic_quotes_runtime</a>
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配置选项将被忽略，而
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<code class="parameter">string</code> 中的斜线将不会被抽去。
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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.fwrite-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="simpara">
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<span class="function"><strong>fwrite()</strong></span> 返回写入的字符数，出现错误时则返回 <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.fwrite-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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Writing to a network stream may end before the whole string is written.
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Return value of <span class="function"><strong>fwrite()</strong></span> may be checked:
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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 /></span><span style="color: #007700">function </span><span style="color: #0000BB">fwrite_stream</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">$string</span><span style="color: #007700">) {<br /> for (</span><span style="color: #0000BB">$written </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$written </span><span style="color: #007700">< </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">); </span><span style="color: #0000BB">$written </span><span style="color: #007700">+= </span><span style="color: #0000BB">$fwrite</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$fwrite </span><span style="color: #007700">= </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">, </span><span style="color: #0000BB">$written</span><span style="color: #007700">));<br /> if (</span><span style="color: #0000BB">$fwrite </span><span style="color: #007700">=== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">$written</span><span style="color: #007700">;<br /> }<br /> }<br /> return </span><span style="color: #0000BB">$written</span><span style="color: #007700">;<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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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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在区分二进制文件和文本文件的系统上（如 Windows）
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打开文件时，<span class="function"><a href="fopen.html" class="function">fopen()</a></span> 函数的 mode 参数要加上 'b'。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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If <code class="parameter">handle</code> was <span class="function"><a href="fopen.html" class="function">fopen()</a></span>ed in
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append mode, <span class="function"><strong>fwrite()</strong></span>s are atomic (unless the size of
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<code class="parameter">string</code> exceeds the filesystem's block size, on some
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platforms, and as long as the file is on a local filesystem). That is,
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there is no need to <span class="function"><a href="flock.html" class="function">flock()</a></span> a resource before calling
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<span class="function"><strong>fwrite()</strong></span>; all of the data will be written without
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interruption.
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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If writing twice to the file pointer, then the data will be appended to
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the end of the file content:
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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 />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'data.txt'</span><span style="color: #007700">, </span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">'1'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">'23'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// the content of 'data.txt' is now 123 and not 23!<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fwrite-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-2810">
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<p><strong>Example #1 一个简单的 <span class="function"><strong>fwrite()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$filename </span><span style="color: #007700">= </span><span style="color: #DD0000">'test.txt'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$somecontent </span><span style="color: #007700">= </span><span style="color: #DD0000">"添加这些文字到文件\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// 首先我们要确定文件存在并且可写。<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">is_writable</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #FF8000">// 在这个例子里，我们将使用添加模式打开$filename，<br /> // 因此，文件指针将会在文件的末尾，<br /> // 那就是当我们使用fwrite()的时候，$somecontent将要写入的地方。<br /> </span><span style="color: #007700">if (!</span><span style="color: #0000BB">$handle </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">, </span><span style="color: #DD0000">'a'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"不能打开文件 </span><span style="color: #0000BB">$filename</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br /> exit;<br /> }<br /><br /> </span><span style="color: #FF8000">// 将$somecontent写入到我们打开的文件中。<br /> </span><span style="color: #007700">if (</span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #0000BB">$somecontent</span><span style="color: #007700">) === </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"不能写入到文件 </span><span style="color: #0000BB">$filename</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br /> exit;<br /> }<br /><br /> echo </span><span style="color: #DD0000">"成功地将 </span><span style="color: #0000BB">$somecontent</span><span style="color: #DD0000"> 写入到文件</span><span style="color: #0000BB">$filename</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">);<br /><br />} else {<br /> echo </span><span style="color: #DD0000">"文件 </span><span style="color: #0000BB">$filename</span><span style="color: #DD0000"> 不可写"</span><span style="color: #007700">;<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 seealso" id="refsect1-function.fwrite-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="fopen.html" class="function" rel="rdfs-seeAlso">fopen()</a> - 打开文件或者 URL</span></li>
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<li class="member"><span class="function"><a href="fsockopen.html" class="function" rel="rdfs-seeAlso">fsockopen()</a> - 打开一个网络连接或者一个Unix套接字连接</span></li>
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<li class="member"><span class="function"><a href="popen.html" class="function" rel="rdfs-seeAlso">popen()</a> - 打开进程文件指针</span></li>
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<li class="member"><span class="function"><a href="file_get_contents.html" class="function" rel="rdfs-seeAlso">file_get_contents()</a> - 将整个文件读入一个字符串</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> |