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  2. <html>
    3. 

  3.  <head>
    4. 

  4.   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    5. 

  5.   <title>删除字符串末端的空白字符（或者其他字符）</title>
    6. 

  6. 

  7.  </head>
    8. 

  8.  <body><div class="manualnavbar" style="text-align: center;">
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  9.  <div class="prev" style="text-align: left; float: left;"><a href="function.quotemeta.html">quotemeta</a></div>
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    11. 

  11.  <div class="up"><a href="ref.strings.html">字符串函数</a></div>
    12. 

  12.  <div class="home"><a href="index.html">PHP Manual</a></div>
    13. 

  13. </div><hr /><div id="function.rtrim" class="refentry">
    14. 

  14.  <div class="refnamediv">
    15. 

  15.   <h1 class="refname">rtrim</h1>
    16. 

  16.   <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">rtrim</span> &mdash; <span class="dc-title">删除字符串末端的空白字符（或者其他字符）</span></p>
    17. 

  17. 

  18.  </div>
    19. 

  19.  
    20. 

  20.  <div class="refsect1 description" id="refsect1-function.rtrim-description">
    21. 

  21.   <h3 class="title">说明</h3>
    22. 

  22.   <div class="methodsynopsis dc-description">
    23. 

  23.    <span class="type">string</span> <span class="methodname"><strong>rtrim</strong></span>
    24. 

  24.     ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
    25. 

  25.    [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$charlist</code></span>
    26. 

  26.   ] )</div>
    27. 

  27. 

  28.   <p class="para rdfs-comment">
    29. 

  29.    该函数删除 <em><code class="parameter">str</code></em> 末端的空白字符并返回。
    30. 

  30.   </p>
    31. 

  31.   <p class="para">
    32. 

  32.    不使用第二个参数， <span class="function"><strong>rtrim()</strong></span> 仅删除以下字符：
    33. 

  33.    
    34. 

  34.    <ul class="itemizedlist">
    35. 

  35.     <li class="listitem">
    36. 

  36.      <span class="simpara">
    37. 

  37.       &quot; &quot; (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>32</em>
    38. 

  38.       (<em>0x20</em>))，普通空白符。
    39. 

  39.      </span>
    40. 

  40.     </li>
    41. 

  41.     <li class="listitem">
    42. 

  42.      <span class="simpara">
    43. 

  43.       &quot;\t&quot; (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>9</em>
    44. 

  44.       (<em>0x09</em>))，制表符。
    45. 

  45.      </span>
    46. 

  46.     </li>
    47. 

  47.     <li class="listitem">
    48. 

  48.      <span class="simpara">
    49. 

  49.       &quot;\n&quot; (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>10</em>
    50. 

  50.       (<em>0x0A</em>))，换行符。
    51. 

  51.      </span>
    52. 

  52.     </li>
    53. 

  53.     <li class="listitem">
    54. 

  54.      <span class="simpara">
    55. 

  55.       &quot;\r&quot; (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>13</em>
    56. 

  56.       (<em>0x0D</em>))，回车符。
    57. 

  57.      </span>
    58. 

  58.     </li>
    59. 

  59.     <li class="listitem">
    60. 

  60.      <span class="simpara">
    61. 

  61.       &quot;\0&quot; (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>0</em>
    62. 

  62.       (<em>0x00</em>))，<em>NUL</em> 空字节符。
    63. 

  63.      </span>
    64. 

  64.     </li>
    65. 

  65.     <li class="listitem">
    66. 

  66.      <span class="simpara"> 
    67. 

  67.       &quot;\x0B&quot; (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <em>11</em>
    68. 

  68.       (<em>0x0B</em>))，垂直制表符。
    69. 

  69.      </span>
    70. 

  70.     </li>
    71. 

  71.    </ul>
    72. 

  72.   </p>
    73. 

  73.  </div>
    74. 

  74. 

  75. 

  76.  <div class="refsect1 parameters" id="refsect1-function.rtrim-parameters">
    77. 

  77.   <h3 class="title">参数</h3>
    78. 

  78.   <p class="para">
    79. 

  79.    <dl>
    80. 

  80. 

  81.     <dt>
    82. 

  82. 

  83.      <span class="term"><em><code class="parameter">str</code></em></span>
    84. 

  84.      <dd>
    85. 

  85. 

  86.       <p class="para">
    87. 

  87.        输入字符串。
    88. 

  88.       </p>
    89. 

  89.      </dd>
    90. 

  90. 

  91.     </dt>
    92. 

  92. 

  93.     <dt>
    94. 

  94. 

  95.      <span class="term"><em><code class="parameter">charlist</code></em></span>
    96. 

  96.      <dd>
    97. 

  97. 

  98.       <p class="para">
    99. 

  99.        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。
    100. 

  100.       </p>
    101. 

  101.      </dd>
    102. 

  102. 

  103.     </dt>
    104. 

  104. 

  105.    </dl>
    106. 

  106. 

  107.   </p>
    108. 

  108.  </div>
    109. 

  109. 

  110. 

  111.  <div class="refsect1 returnvalues" id="refsect1-function.rtrim-returnvalues">
    112. 

  112.   <h3 class="title">返回值</h3>
    113. 

  113.   <p class="para">
    114. 

  114.    返回改变后的字符串。
    115. 

  115.   </p>
    116. 

  116.  </div>
    117. 

  117. 

  118. 

  119.  <div class="refsect1 changelog" id="refsect1-function.rtrim-changelog">
    120. 

  120.   <h3 class="title">更新日志</h3>
    121. 

  121.   <p class="para">
    122. 

  122.    <table class="doctable informaltable">
    123. 

  123.     
    124. 

  124.      <thead>
    125. 

  125.       <tr>
    126. 

  126.        <th>版本</th>
    127. 

  127.        <th>说明</th>
    128. 

  128.       </tr>
    129. 

  129. 

  130.      </thead>
    131. 

  131. 

  132.      <tbody class="tbody">
    133. 

  133.       <tr>
    134. 

  134.        <td>4.1.0</td>
    135. 

  135.        <td>
    136. 

  136.         新增 <em><code class="parameter">charlist</code></em> 参数。
    137. 

  137.        </td>
    138. 

  138.       </tr>
    139. 

  139. 

  140.      </tbody>
    141. 

  141.     
    142. 

  142.    </table>
    143. 

  143. 

  144.   </p>
    145. 

  145.  </div>
    146. 

  146. 

  147. 

  148.  <div class="refsect1 examples" id="refsect1-function.rtrim-examples">
    149. 

  149.   <h3 class="title">范例</h3>
    150. 

  150.   <p class="para">
    151. 

  151.    <div class="example" id="example-4616">
    152. 

  152.     <p><strong>Example #1  <span class="function"><strong>rtrim()</strong></span> 使用范例</strong></p>
    153. 

  153.     <div class="example-contents">
    154. 

  154. <div class="phpcode"><code><span style="color: #000000">
    155. 

  155. <span style="color: #0000BB">&lt;?php<br /><br />$text&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"\t\tThese&nbsp;are&nbsp;a&nbsp;few&nbsp;words&nbsp;:)&nbsp;...&nbsp;&nbsp;"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$binary&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"\x09Example&nbsp;string\x0A"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$hello&nbsp;&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"Hello&nbsp;World"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$binary</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$hello</span><span style="color: #007700">);<br /><br />print&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$trimmed&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$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&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"&nbsp;\t."</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$trimmed&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$hello</span><span style="color: #007700">,&nbsp;</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">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;删除&nbsp;$binary&nbsp;末端的&nbsp;ASCII&nbsp;码控制字符<br />//&nbsp;(包括&nbsp;0&nbsp;-&nbsp;31)<br /></span><span style="color: #0000BB">$clean&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$binary</span><span style="color: #007700">,&nbsp;</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">?&gt;</span>
    156. 

  156. </span>
    157. 

  157. </code></div>
    158. 

  158.     </div>
    159. 

  159. 

  160.     <div class="example-contents"><p>以上例程会输出：</p></div>
    161. 

  161.     <div class="example-contents screen">
    162. 

  162. <div class="cdata"><pre>
    163. 

  163. string(32) &quot;        These are a few words :) ...  &quot;
    164. 

  164. string(16) &quot;    Example string
    165. 

  165. &quot;
    166. 

  166. string(11) &quot;Hello World&quot;
    167. 

  167. 

  168. string(30) &quot;        These are a few words :) ...&quot;
    169. 

  169. string(26) &quot;        These are a few words :)&quot;
    170. 

  170. string(9) &quot;Hello Wor&quot;
    171. 

  171. string(15) &quot;    Example string&quot;
    172. 

  172. </pre></div>
    173. 

  173.     </div>
    174. 

  174.    </div>   
    175. 

  175.   </p>
    176. 

  176.  </div>
    177. 

  177. 

  178. 

  179.  <div class="refsect1 seealso" id="refsect1-function.rtrim-seealso">
    180. 

  180.   <h3 class="title">参见</h3>
    181. 

  181.   <p class="para">
    182. 

  182.    <ul class="simplelist">
    183. 

  183.     <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>
    184. 

  184.     <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>
    185. 

  185.    </ul>
    186. 

  186.   </p>
    187. 

  187.  </div>
    188. 

  188. 

  189. 

  190. </div><hr /><div class="manualnavbar" style="text-align: center;">
    191. 

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    193. 

  193.  <div class="up"><a href="ref.strings.html">字符串函数</a></div>
    194. 

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    195. 

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    196. 

  196.