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?>
<div id="function.hexdec" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">hexdec</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">hexdec</span> &mdash; <span class="dc-title">十六进制转换为十进制</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.hexdec-description">
  <h3 class="title">说明</h3>
   <div class="methodsynopsis dc-description">
    <span class="methodname"><strong>hexdec</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.string.php" class="type string">string</a></span> <code class="parameter">$hex_string</code></span>): <span class="type"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span>|<span class="type"><a href="language.types.float.php" class="type float">float</a></span></span></div>

  <p class="para rdfs-comment">
   返回与 <code class="parameter">hex_string</code>
   参数所表示的十六进制数等值的的十进制数。<span class="function"><strong>hexdec()</strong></span>
   将一个十六进制字符串转换为十进制数。
  </p>
  <p class="para">
   <span class="function"><strong>hexdec()</strong></span> 会忽略它遇到的任意非十六进制的字符。自 PHP 7.4.0 起，弃用使用任何无效字符。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.hexdec-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt><code class="parameter">hex_string</code></dt>
     <dd>
      <p class="para">
       要转换的十六进制的字符串
      </p>
     </dd>
    
   </dl>
  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.hexdec-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   <code class="parameter">hex_string</code> 十进制的表示
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.hexdec-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>7.4.0</td>
      <td>
       传递任何无效字符现在将生成弃用通知。但仍会计算结果，就好像无效字符不存在一样。
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.hexdec-examples">
  <h3 class="title">示例</h3>
  <p class="para">
   <div class="example" id="example-1">
    <p><strong>示例 #1 <span class="function"><strong>hexdec()</strong></span> 示例</strong></p>
    <div class="example-contents">
<div class="annotation-interactive phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"ee"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// prints "int(238)"<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"a0"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// prints "int(160)"<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
    </div>

   </div>
  </p>
  <p class="para">
   <div class="example" id="example-2">
    <p><strong>示例 #2 <span class="function"><strong>hexdec()</strong></span> 包含无效字符</strong></p>
    <div class="example-contents">
<div class="annotation-interactive phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"See"</span><span style="color: #007700">));  </span><span style="color: #FF8000">// print "int(238)"<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"that"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// print "int(10)"<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.hexdec-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">注意</strong>: 
   <p class="para">
    此函数可以将太大的数字转换为适应平台的 <span class="type"><a href="language.types.integer.php" class="type int">int</a></span> 类型，在这种情况下，较大值将会作为
    <span class="type"><a href="language.types.float.php" class="type float">float</a></span> 返回。
   </p>
  </p></blockquote>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.hexdec-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li><span class="function"><a href="function.dechex.php" class="function" rel="rdfs-seeAlso">dechex()</a> - 十进制转换为十六进制</span></li>
    <li><span class="function"><a href="function.bindec.php" class="function" rel="rdfs-seeAlso">bindec()</a> - 二进制转换为十进制</span></li>
    <li><span class="function"><a href="function.octdec.php" class="function" rel="rdfs-seeAlso">octdec()</a> - 八进制转换为十进制</span></li>
    <li><span class="function"><a href="function.base-convert.php" class="function" rel="rdfs-seeAlso">base_convert()</a> - 在任意进制之间转换数字</span></li>
   </ul>
  </p>
 </div>

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