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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.html-entity-decode"
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>html_entity_decode</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN225116"
></A
><P
>    (PHP 4 &#62;= 4.3.0, PHP 5)</P
>html_entity_decode&nbsp;--&nbsp;
     Convert all HTML entities to their applicable characters
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN225119"
></A
><H2
>Description</H2
>string <B
CLASS="methodname"
>html_entity_decode</B
> ( string string [, int quote_style [, string charset]] )<BR
></BR
><P
>&#13;     <B
CLASS="function"
>html_entity_decode()</B
> is the opposite of
     <A
HREF="function.htmlentities.html"
><B
CLASS="function"
>htmlentities()</B
></A
> in that it converts all HTML entities
     to their applicable characters from <CODE
CLASS="parameter"
>string</CODE
>.
    </P
><P
>&#13;     The optional second <CODE
CLASS="parameter"
>quote_style</CODE
> parameter lets 
     you define what will be done with 'single' and "double" quotes.  It takes 
     on one of three constants with the default being 
     <TT
CLASS="constant"
><B
>ENT_COMPAT</B
></TT
>:
     <DIV
CLASS="table"
><A
NAME="AEN225140"
></A
><P
><B
>表 1. Available <CODE
CLASS="parameter"
>quote_style</CODE
> constants</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Constant Name</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="constant"
><B
>ENT_COMPAT</B
></TT
></TD
><TD
>Will convert double-quotes and leave single-quotes alone.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>ENT_QUOTES</B
></TT
></TD
><TD
>Will convert both double and single quotes.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>ENT_NOQUOTES</B
></TT
></TD
><TD
>Will leave both double and single quotes unconverted.</TD
></TR
></TBODY
></TABLE
></DIV
>
    </P
><P
>&#13;     The ISO-8859-1 character set is used as default for the optional third
     <CODE
CLASS="parameter"
>charset</CODE
>. This defines the character set used in
     conversion.
    </P
><P
>&#13; PHP 4.3.0 及其后续版本支持如下字符集。
 <DIV
CLASS="table"
><A
NAME="AEN225164"
></A
><P
><B
>表 2. 已支持字符集</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>字符集</TH
><TH
>别名</TH
><TH
>描述</TH
></TR
></THEAD
><TBODY
><TR
><TD
>ISO-8859-1</TD
><TD
>ISO8859-1</TD
><TD
>&#13;      西欧，Latin-1
     </TD
></TR
><TR
><TD
>ISO-8859-15</TD
><TD
>ISO8859-15</TD
><TD
>&#13;      西欧，Latin-9。增加了 Latin-1（ISO-8859-1）中缺少的欧元符号、法国及芬兰字母。
     </TD
></TR
><TR
><TD
>UTF-8</TD
><TD
>&nbsp;</TD
><TD
>&#13;      ASCII 兼容多字节 8-bit Unicode。
     </TD
></TR
><TR
><TD
>cp866</TD
><TD
>ibm866, 866</TD
><TD
>&#13;      DOS-特有的 Cyrillic 字母字符集。PHP 4.3.2 开始支持该字符集。
     </TD
></TR
><TR
><TD
>cp1251</TD
><TD
>Windows-1251, win-1251, 1251</TD
><TD
>&#13;      Windows-特有的 Cyrillic 字母字符集。PHP 4.3.2 开始支持该字符集。
     </TD
></TR
><TR
><TD
>cp1252</TD
><TD
>Windows-1252, 1252</TD
><TD
>&#13;      Windows 对于西欧特有的字符集。
     </TD
></TR
><TR
><TD
>KOI8-R</TD
><TD
>koi8-ru, koi8r</TD
><TD
>&#13;      俄文。PHP 4.3.2 开始支持该字符集。
     </TD
></TR
><TR
><TD
>BIG5</TD
><TD
>950</TD
><TD
>&#13;      繁体中文，主要用于中国台湾。
     </TD
></TR
><TR
><TD
>GB2312</TD
><TD
>936</TD
><TD
>&#13;      简体中文，国际标准字符集。
     </TD
></TR
><TR
><TD
>BIG5-HKSCS</TD
><TD
>&nbsp;</TD
><TD
>&#13;      繁体中文，Big5 的延伸，主要用于香港。
     </TD
></TR
><TR
><TD
>Shift_JIS</TD
><TD
>SJIS, 932</TD
><TD
>&#13;      日文。
     </TD
></TR
><TR
><TD
>EUC-JP</TD
><TD
>EUCJP</TD
><TD
>&#13;      日文。
     </TD
></TR
></TBODY
></TABLE
></DIV
>
 <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
   ISO-8859-1 将代替任何其它无法识别的字符集。
  </P
></BLOCKQUOTE
></DIV
>
</P
><P
>&#13;    <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      This function doesn't support multi-byte character sets in PHP &#60; 5.
     </P
></BLOCKQUOTE
></DIV
>
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN225226"
></A
><P
><B
>例 1. Decoding HTML entities</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$orig </font><font color="#007700">= </font><font color="#DD0000">"I'll \"walk\" the &lt;b&gt;dog&lt;/b&gt; now"</font><font color="#007700">;<br /><br /></font><font color="#0000BB">$a </font><font color="#007700">= </font><font color="#0000BB">htmlentities</font><font color="#007700">(</font><font color="#0000BB">$orig</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$b </font><font color="#007700">= </font><font color="#0000BB">html_entity_decode</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">);<br /><br />echo </font><font color="#0000BB">$a</font><font color="#007700">; </font><font color="#FF8000">// I'll &amp;quot;walk&amp;quot; the &amp;lt;b&amp;gt;dog&amp;lt;/b&amp;gt; now<br /><br /></font><font color="#007700">echo </font><font color="#0000BB">$b</font><font color="#007700">; </font><font color="#FF8000">// I'll "walk" the &lt;b&gt;dog&lt;/b&gt; now<br /><br /><br />// For users prior to PHP 4.3.0 you may do this:<br /></font><font color="#007700">function </font><font color="#0000BB">unhtmlentities</font><font color="#007700">(</font><font color="#0000BB">$string</font><font color="#007700">) <br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// replace numeric entities<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$string </font><font color="#007700">= </font><font color="#0000BB">preg_replace</font><font color="#007700">(</font><font color="#DD0000">'~&amp;#x([0-9a-f]+);~ei'</font><font color="#007700">, </font><font color="#DD0000">'chr(hexdec("\\1"))'</font><font color="#007700">, </font><font color="#0000BB">$string</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$string </font><font color="#007700">= </font><font color="#0000BB">preg_replace</font><font color="#007700">(</font><font color="#DD0000">'~&amp;#([0-9]+);~e'</font><font color="#007700">, </font><font color="#DD0000">'chr("\\1")'</font><font color="#007700">, </font><font color="#0000BB">$string</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// replace literal entities<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$trans_tbl </font><font color="#007700">= </font><font color="#0000BB">get_html_translation_table</font><font color="#007700">(</font><font color="#0000BB">HTML_ENTITIES</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$trans_tbl </font><font color="#007700">= </font><font color="#0000BB">array_flip</font><font color="#007700">(</font><font color="#0000BB">$trans_tbl</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">strtr</font><font color="#007700">(</font><font color="#0000BB">$string</font><font color="#007700">, </font><font color="#0000BB">$trans_tbl</font><font color="#007700">);<br />}<br /><br /></font><font color="#0000BB">$c </font><font color="#007700">= </font><font color="#0000BB">unhtmlentities</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">);<br /><br />echo </font><font color="#0000BB">$c</font><font color="#007700">; </font><font color="#FF8000">// I'll "walk" the &lt;b&gt;dog&lt;/b&gt; now<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
       You might wonder why trim(html_entity_decode('&#38;nbsp;')); doesn't
       reduce the string to an empty string, that's because the '&#38;nbsp;'
       entity is not ASCII code 32 (which is stripped by
       <A
HREF="function.trim.html"
><B
CLASS="function"
>trim()</B
></A
>) but ASCII code 160 (0xa0) in the default ISO
       8859-1 characterset.
      </P
></BLOCKQUOTE
></DIV
>
    </P
><P
>&#13;     See also <A
HREF="function.htmlentities.html"
><B
CLASS="function"
>htmlentities()</B
></A
>,
     <A
HREF="function.htmlspecialchars.html"
><B
CLASS="function"
>htmlspecialchars()</B
></A
>,
     <A
HREF="function.get-html-translation-table.html"
><B
CLASS="function"
>get_html_translation_table()</B
></A
>, 
     and <A
HREF="function.urldecode.html"
><B
CLASS="function"
>urldecode()</B
></A
>.
    </P
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