/php/function.rtrim.html
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- <title>删除字符串末端的空白字符(或者其他字符)</title>
- </head>
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- </div><hr /><div id="function.rtrim" class="refentry">
- <div class="refnamediv">
- <h1 class="refname">rtrim</h1>
- <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">rtrim</span> — <span class="dc-title">删除字符串末端的空白字符(或者其他字符)</span></p>
- </div>
-
- <div class="refsect1 description" id="refsect1-function.rtrim-description">
- <h3 class="title">说明</h3>
- <div class="methodsynopsis dc-description">
- <span class="type">string</span> <span class="methodname"><strong>rtrim</strong></span>
- ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
- [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$charlist</code></span>
- ] )</div>
- <p class="para rdfs-comment">
- 该函数删除 <em><code class="parameter">str</code></em> 末端的空白字符并返回。
- </p>
- <p class="para">
- 不使用第二个参数, <span class="function"><strong>rtrim()</strong></span> 仅删除以下字符:
-
- <ul class="itemizedlist">
- <li class="listitem">
- <span class="simpara">
- " " (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>32</em>
- (<em>0x20</em>)),普通空白符。
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- "\t" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>9</em>
- (<em>0x09</em>)),制表符。
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- "\n" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>10</em>
- (<em>0x0A</em>)),换行符。
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- "\r" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>13</em>
- (<em>0x0D</em>)),回车符。
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- "\0" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>0</em>
- (<em>0x00</em>)),<em>NUL</em> 空字节符。
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- "\x0B" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>11</em>
- (<em>0x0B</em>)),垂直制表符。
- </span>
- </li>
- </ul>
- </p>
- </div>
- <div class="refsect1 parameters" id="refsect1-function.rtrim-parameters">
- <h3 class="title">参数</h3>
- <p class="para">
- <dl>
- <dt>
- <span class="term"><em><code class="parameter">str</code></em></span>
- <dd>
- <p class="para">
- 输入字符串。
- </p>
- </dd>
- </dt>
- <dt>
- <span class="term"><em><code class="parameter">charlist</code></em></span>
- <dd>
- <p class="para">
- 通过指定 <em><code class="parameter">charlist</code></em>,可以指定想要删除的字符列表。简单地列出你想要删除的全部字符。使用 <em>..</em> 格式,可以指定一个范围。
- </p>
- </dd>
- </dt>
- </dl>
- </p>
- </div>
- <div class="refsect1 returnvalues" id="refsect1-function.rtrim-returnvalues">
- <h3 class="title">返回值</h3>
- <p class="para">
- 返回改变后的字符串。
- </p>
- </div>
- <div class="refsect1 changelog" id="refsect1-function.rtrim-changelog">
- <h3 class="title">更新日志</h3>
- <p class="para">
- <table class="doctable informaltable">
-
- <thead>
- <tr>
- <th>版本</th>
- <th>说明</th>
- </tr>
- </thead>
- <tbody class="tbody">
- <tr>
- <td>4.1.0</td>
- <td>
- 新增 <em><code class="parameter">charlist</code></em> 参数。
- </td>
- </tr>
- </tbody>
-
- </table>
- </p>
- </div>
- <div class="refsect1 examples" id="refsect1-function.rtrim-examples">
- <h3 class="title">范例</h3>
- <p class="para">
- <div class="example" id="example-4616">
- <p><strong>Example #1 <span class="function"><strong>rtrim()</strong></span> 使用范例</strong></p>
- <div class="example-contents">
- <div class="phpcode"><code><span style="color: #000000">
- <span style="color: #0000BB"><?php<br /><br />$text </span><span style="color: #007700">= </span><span style="color: #DD0000">"\t\tThese are a few words :) ... "</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$binary </span><span style="color: #007700">= </span><span style="color: #DD0000">"\x09Example string\x0A"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$hello </span><span style="color: #007700">= </span><span style="color: #DD0000">"Hello World"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #0000BB">$binary</span><span style="color: #007700">, </span><span style="color: #0000BB">$hello</span><span style="color: #007700">);<br /><br />print </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$trimmed </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$trimmed </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">" \t."</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$trimmed </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$hello</span><span style="color: #007700">, </span><span style="color: #DD0000">"Hdle"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 删除 $binary 末端的 ASCII 码控制字符<br />// (包括 0 - 31)<br /></span><span style="color: #0000BB">$clean </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$binary</span><span style="color: #007700">, </span><span style="color: #DD0000">"\x00..\x1F"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$clean</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
- </span>
- </code></div>
- </div>
- <div class="example-contents"><p>以上例程会输出:</p></div>
- <div class="example-contents screen">
- <div class="cdata"><pre>
- string(32) " These are a few words :) ... "
- string(16) " Example string
- "
- string(11) "Hello World"
- string(30) " These are a few words :) ..."
- string(26) " These are a few words :)"
- string(9) "Hello Wor"
- string(15) " Example string"
- </pre></div>
- </div>
- </div>
- </p>
- </div>
- <div class="refsect1 seealso" id="refsect1-function.rtrim-seealso">
- <h3 class="title">参见</h3>
- <p class="para">
- <ul class="simplelist">
- <li class="member"> <span class="function"><a href="function.trim.html" class="function" rel="rdfs-seeAlso">trim()</a> - 去除字符串首尾处的空白字符(或者其他字符)</span></li>
- <li class="member"> <span class="function"><a href="function.ltrim.html" class="function" rel="rdfs-seeAlso">ltrim()</a> - Strip whitespace (or other characters) from the beginning of a string</span></li>
- </ul>
- </p>
- </div>
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