mb-decode-numericentity.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: d6f54016d62904cfd8200604aadd5e3f0d9bad97 Maintainer: daijie Status: ready -->
<!-- CREDITS: mowangjuanzi, Luffy -->
<refentry xml:id="function.mb-decode-numericentity" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>mb_decode_numericentity</refname>
  <refpurpose>根据 HTML 数字字符串解码成字符</refpurpose>
 </refnamediv>
   
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>mb_decode_numericentity</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
   <methodparam><type>array</type><parameter>map</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>encoding</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   将 <type>string</type> 的数字字符串引用按指定的字符块转换成 <parameter>string</parameter>。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       要解码的 <type>string</type>。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>map</parameter></term>
     <listitem>
      <para>
       <parameter>map</parameter> 是 <type>array</type>，指定了要转换的代码区域。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>encoding</parameter></term>
     <listitem>
      &mbstring.encoding.parameter;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>is_hex</parameter></term>
     <listitem>
      <para>
       不使用此参数。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   转换后的 <type>string</type>。
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <simpara>
   如果 <parameter>map</parameter> 不是 &integer;s 的列表，抛出 <exceptionname>ValueError</exceptionname>。
  </simpara>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.4.0</entry>
      <entry>
       如果 <parameter>map</parameter> 不是 &integer;s 的列表，
       <function>mb_decode_numericentity</function> 现在抛出
       <exceptionname>ValueError</exceptionname>。
      </entry>
     </row>
     &mbstring.changelog.encoding-nullable;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><parameter>map</parameter> 示例</title>
    <programlisting>
<![CDATA[
<?php
$convmap = array (
   int start_code1, int end_code1, int offset1, int mask1,
   int start_code2, int end_code2, int offset2, int mask2,
   // ........
   int start_codeN, int end_codeN, int offsetN, int maskN );
// Specify Unicode value for start_codeN and end_codeN
// Add offsetN to value and take bit-wise 'AND' with maskN, 
// then convert value to numeric string reference.
?>
]]>
    </programlisting>
   </example>
  </para>

  <para>
   <example>
    <title><parameter>map</parameter> 示例，转义 JavaScript 字符串</title>
    <programlisting role="php">
<![CDATA[
<?php
function escape_javascript_string($str) {
  $map = [
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,0,0, // 49
          0,0,0,0,0,0,0,0,1,1,
          1,1,1,1,1,0,0,0,0,0,
          0,0,0,0,0,0,0,0,0,0,
          0,0,0,0,0,0,0,0,0,0,
          0,1,1,1,1,1,1,0,0,0, // 99
          0,0,0,0,0,0,0,0,0,0,
          0,0,0,0,0,0,0,0,0,0,
          0,0,0,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1, // 149
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1, // 199
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1,
          1,1,1,1,1,1,1,1,1,1, // 249
          1,1,1,1,1,1,1, // 255
          ];
  // Char encoding is UTF-8
  $mblen = mb_strlen($str, 'UTF-8');
  $utf32 = bin2hex(mb_convert_encoding($str, 'UTF-32', 'UTF-8'));
  for ($i=0, $encoded=''; $i < $mblen; $i++) {
      $u = substr($utf32, $i*8, 8);
      $v = base_convert($u, 16, 10);
      if ($v < 256 && $map[$v]) {
        $encoded .= '\\x'.substr($u, 6,2);
      } else if ($v == 2028) {
        $encoded .= '\\u2028';
      } else if ($v == 2029) {
        $encoded .= '\\u2029';
      } else {
        $encoded .= mb_convert_encoding(hex2bin($u), 'UTF-8', 'UTF-32');
      }
   }
   return $encoded;
}
 
// Test data
$convmap = [ 0x0, 0xffff, 0, 0xffff ];
$msg = '';
for ($i=0; $i < 1000; $i++) {
  // chr() cannot generate correct UTF-8 data larger value than 128, use mb_decode_numericentity().
  $msg .= mb_decode_numericentity('&#'.$i.';', $convmap, 'UTF-8');
}
 
// var_dump($msg);
var_dump(escape_javascript_string($msg));
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mb_encode_numericentity</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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