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

  5.   <title>计算字串出现的次数</title>
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  6. 

  7.  </head>
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  8.  <body><div class="manualnavbar" style="text-align: center;">
    9. 

  9.  <div class="prev" style="text-align: left; float: left;"><a href="function.substr-compare.html">substr_compare</a></div>
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  10.  <div class="next" style="text-align: right; float: right;"><a href="function.substr-replace.html">substr_replace</a></div>
    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.substr-count" class="refentry">
    14. 

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

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

  16.   <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">substr_count</span> &mdash; <span class="dc-title">计算字串出现的次数</span></p>
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  17. 

  18.  </div>
    19. 

  19.  <div class="refsect1 description" id="refsect1-function.substr-count-description">
    20. 

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

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

  22.    <span class="type">int</span> <span class="methodname"><strong>substr_count</strong></span>
    23. 

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

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

  25.    [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 0</span></span>
    26. 

  26.    [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code></span>
    27. 

  27.   ]] )</div>
    28. 

  28. 

  29.   <p class="para rdfs-comment">
    30. 

  30.     <span class="function"><strong>substr_count()</strong></span> 返回子字符串<em><code class="parameter">needle</code></em> 在字符串 <em><code class="parameter">haystack</code></em> 中出现的次数。注意 <em><code class="parameter">needle</code></em> 区分大小写。
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  31.   </p>
    32. 

  32.   <blockquote class="note"><p><strong class="note">Note</strong>: 
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  33.    <p class="para">
    34. 

  34.     该函数不会计算重叠字符串。参见下面的例子。
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  35.    </p>
    36. 

  36.   </p></blockquote>
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  37.  </div>
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  38. 

  39. 

  40.  <div class="refsect1 parameters" id="refsect1-function.substr-count-parameters">
    41. 

  41.   <h3 class="title">参数</h3>
    42. 

  42.   <p class="para">
    43. 

  43.    <dl>
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  44. 

  45.     <dt>
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  46. 

  47.      <span class="term"><em><code class="parameter">haystack</code></em></span>
    48. 

  48.      <dd>
    49. 

  49. 

  50.       <p class="para">
    51. 

  51.        在此字符串中进行搜索。
    52. 

  52.       </p>
    53. 

  53.      </dd>
    54. 

  54. 

  55.     </dt>
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  56. 

  57.     <dt>
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  58. 

  59.      <span class="term"><em><code class="parameter">needle</code></em></span>
    60. 

  60.      <dd>
    61. 

  61. 

  62.       <p class="para">
    63. 

  63.        要搜索的字符串。
    64. 

  64.       </p>
    65. 

  65.      </dd>
    66. 

  66. 

  67.     </dt>
    68. 

  68. 

  69.     <dt>
    70. 

  70. 

  71.      <span class="term"><em><code class="parameter">offset</code></em></span>
    72. 

  72.      <dd>
    73. 

  73. 

  74.       <p class="para">
    75. 

  75.        开始计数的偏移位置。
    76. 

  76.       </p>
    77. 

  77.      </dd>
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  78. 

  79.     </dt>
    80. 

  80. 

  81.     <dt>
    82. 

  82. 

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

  84.      <dd>
    85. 

  85. 

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

  87.        指定偏移位置之后的最大搜索长度。如果偏移量加上这个长度的和大于 <em><code class="parameter">haystack</code></em> 的总长度，则打印警告信息。
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  88.       </p>
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  89.      </dd>
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  90. 

  91.     </dt>
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  92. 

  93.    </dl>
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  94. 

  95.   </p>
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  96.  </div>
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  97. 

  98. 

  99.  <div class="refsect1 returnvalues" id="refsect1-function.substr-count-returnvalues">
    100. 

  100.   <h3 class="title">返回值</h3>
    101. 

  101.   <p class="para">
    102. 

  102.   该函数返回<span class="type"><span class="type 整型">整型</span></span>。
    103. 

  103.   </p>
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  104.  </div>
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  105. 

  106. 

  107.  <div class="refsect1 changelog" id="refsect1-function.substr-count-changelog">
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  108.   <h3 class="title">更新日志</h3>
    109. 

  109.   <p class="para">
    110. 

  110.    <table class="doctable informaltable">
    111. 

  111.     
    112. 

  112.      <thead>
    113. 

  113.       <tr>
    114. 

  114.        <th>版本</th>
    115. 

  115.        <th>说明</th>
    116. 

  116.       </tr>
    117. 

  117. 

  118.      </thead>
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  119. 

  120.      <tbody class="tbody">
    121. 

  121.       <tr>
    122. 

  122.        <td>5.1.0</td>
    123. 

  123.        <td>
    124. 

  124.         新增 <em><code class="parameter">offset</code></em> 和 <em><code class="parameter">length</code></em> 参数。
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  125.        </td>
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  126.       </tr>
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  127. 

  128.      </tbody>
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  129.     
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  130.    </table>
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  131. 

  132.   </p>
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  133.  </div>
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  134. 

  135. 

  136.  <div class="refsect1 examples" id="refsect1-function.substr-count-examples">
    137. 

  137.   <h3 class="title">范例</h3>
    138. 

  138.   <p class="para">
    139. 

  139.    <div class="example" id="example-4672">
    140. 

  140.     <p><strong>Example #1  <span class="function"><strong>substr_count()</strong></span> 范例</strong></p>
    141. 

  141.     <div class="example-contents">
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  142. <div class="phpcode"><code><span style="color: #000000">
    143. 

  143. <span style="color: #0000BB">&lt;?php<br />$text&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'This&nbsp;is&nbsp;a&nbsp;test'</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;14<br /><br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'is'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;2<br /><br />//&nbsp;字符串被简化为&nbsp;'s&nbsp;is&nbsp;a&nbsp;test'，因此输出&nbsp;1<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'is'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;字符串被简化为&nbsp;'s&nbsp;i'，所以输出&nbsp;0<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'is'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;因为&nbsp;5+10&nbsp;&gt;&nbsp;14，所以生成警告<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'is'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /><br /><br /></span><span style="color: #FF8000">//&nbsp;输出&nbsp;1，因为该函数不计算重叠字符串<br /></span><span style="color: #0000BB">$text2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'gcdgcdgcd'</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text2</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'gcdgcd'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
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  144. </span>
    145. 

  145. </code></div>
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  146.     </div>
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  147. 

  148.    </div>
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  149.   </p>
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  150.  </div>
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  151. 

  152. 

  153.  <div class="refsect1 seealso" id="refsect1-function.substr-count-seealso">
    154. 

  154.   <h3 class="title">参见</h3>
    155. 

  155.   <p class="para">
    156. 

  156.    <ul class="simplelist">
    157. 

  157.     <li class="member"> <span class="function"><a href="function.count-chars.html" class="function" rel="rdfs-seeAlso">count_chars()</a> - 返回字符串所用字符的信息</span></li>
    158. 

  158.     <li class="member"> <span class="function"><a href="function.strpos.html" class="function" rel="rdfs-seeAlso">strpos()</a> - 查找字符串首次出现的位置</span></li>
    159. 

  159.     <li class="member"> <span class="function"><a href="function.substr.html" class="function" rel="rdfs-seeAlso">substr()</a> - 返回字符串的子串</span></li>
    160. 

  160.     <li class="member"> <span class="function"><a href="function.strstr.html" class="function" rel="rdfs-seeAlso">strstr()</a> - 查找字符串的首次出现</span></li>
    161. 

  161.    </ul>
    162. 

  162.   </p>
    163. 

  163.  </div>
    164. 

  164. 

  165. </div><hr /><div class="manualnavbar" style="text-align: center;">
    166. 

  166.  <div class="prev" style="text-align: left; float: left;"><a href="function.substr-compare.html">substr_compare</a></div>
    167. 

  167.  <div class="next" style="text-align: right; float: right;"><a href="function.substr-replace.html">substr_replace</a></div>
    168. 

  168.  <div class="up"><a href="ref.strings.html">字符串函数</a></div>
    169. 

  169.  <div class="home"><a href="index.html">PHP Manual</a></div>
    170. 

  170. </div></body></html>
    171. 

  171.