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>utf8_encode</H1
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> (PHP 3 >= 3.0.6, PHP 4, PHP 5)</P
>utf8_encode -- 将 ISO-8859-1 编码的字符串转换为 UTF-8 编码</DIV
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><H2
>描述</H2
>string <B
CLASS="methodname"
>utf8_encode</B
> ( string data )<BR
></BR
><P
> 该函数将 <CODE
CLASS="parameter"
>data</CODE
> 字符串转换为 <TT
CLASS="literal"
>UTF-8</TT
> 编码，并返回编码后的字符串。<TT
CLASS="literal"
>UTF-8</TT
> 是一种用于将<I
CLASS="glossterm"
>宽字符</I
>值转换为字节流的 <ACRONYM
CLASS="acronym"
>Unicode</ACRONYM
> 的标准机制。<TT
CLASS="literal"
>UTF-8</TT
> 对于纯 <ABBR
CLASS="abbrev"
>ASCII</ABBR
> 字符来说是透明的，且是自同步的（也就是说这使得程序能够得知字符从字节流的何处开始），并可被普通字符串比较函数用以比较等操作。PHP 可将 <TT
CLASS="literal"
>UTF-8</TT
> 编码为多达四个字节的字符，如：
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><B
>表 1. UTF-8 编码</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>字节（bytes）</TH
><TH
>位（bits）</TH
><TH
>表 示</TH
></TR
></THEAD
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><TR
><TD
>1</TD
><TD
>7</TD
><TD
>0bbbbbbb</TD
></TR
><TR
><TD
>2</TD
><TD
>11</TD
><TD
>110bbbbb 10bbbbbb</TD
></TR
><TR
><TD
>3</TD
><TD
>16</TD
><TD
>1110bbbb 10bbbbbb 10bbbbbb</TD
></TR
><TR
><TD
>4</TD
><TD
>21</TD
><TD
>11110bbb 10bbbbbb 10bbbbbb 10bbbbbb</TD
></TR
></TBODY
></TABLE
></DIV
>
</P
><P
> 每个 <TT
CLASS="literal"
>UTF-8</TT
> 表示一个能被用以储存字符数据的位。
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