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>iconv_substr</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN84993"
></A
><P
> (PHP 5)</P
>iconv_substr -- Cut out part of a string</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN84996"
></A
><H2
>说明</H2
>string <B
CLASS="methodname"
>iconv_substr</B
> ( string str, int offset [, int length [, string charset]] )<BR
></BR
><P
> Cuts a portion of <CODE
CLASS="parameter"
>str</CODE
> specified by the
<CODE
CLASS="parameter"
>offset</CODE
> and <CODE
CLASS="parameter"
>length</CODE
> parameters.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN85017"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>str</CODE
></DT
><DD
><P
> The original string.
</P
></DD
><DT
><CODE
CLASS="parameter"
>offset</CODE
></DT
><DD
><P
> If <CODE
CLASS="parameter"
>offset</CODE
> is non-negative,
<B
CLASS="function"
>iconv_substr()</B
> cuts the portion out of
<CODE
CLASS="parameter"
>str</CODE
> beginning at <CODE
CLASS="parameter"
>offset</CODE
>'th
character, counting from zero.
</P
><P
> If <CODE
CLASS="parameter"
>offset</CODE
> is negative,
<B
CLASS="function"
>iconv_substr()</B
> cuts out the portion beginning
at the position, <CODE
CLASS="parameter"
>offset</CODE
> characters
away from the end of <CODE
CLASS="parameter"
>str</CODE
>.
</P
></DD
><DT
><CODE
CLASS="parameter"
>length</CODE
></DT
><DD
><P
> If <CODE
CLASS="parameter"
>length</CODE
> is given and is positive, the return
value will contain at most <CODE
CLASS="parameter"
>length</CODE
> characters
of the portion that begins at <CODE
CLASS="parameter"
>offset</CODE
>
(depending on the length of <CODE
CLASS="parameter"
>string</CODE
>).
</P
><P
> If negative <CODE
CLASS="parameter"
>length</CODE
> is passed,
<B
CLASS="function"
>iconv_substr()</B
> cuts the portion out of
<CODE
CLASS="parameter"
>str</CODE
> from the <CODE
CLASS="parameter"
>offset</CODE
>'th
character up to the character that is
<CODE
CLASS="parameter"
>length</CODE
> characters away from the end of the string.
In case <CODE
CLASS="parameter"
>offset</CODE
> is also negative, the start position
is calculated beforehand according to the rule explained above.
</P
></DD
><DT
><CODE
CLASS="parameter"
>charset</CODE
></DT
><DD
><P
> If <CODE
CLASS="parameter"
>charset</CODE
> parameter is omitted,
<CODE
CLASS="parameter"
>string</CODE
> are assumed to be encoded in
<A
HREF="ref.iconv.html#iconv.configuration"
>iconv.internal_encoding</A
>.
</P
><P
> Note that <CODE
CLASS="parameter"
>offset</CODE
> and <CODE
CLASS="parameter"
>length</CODE
>
parameters are always deemed to represent offsets that are
calculated on the basis of the character set determined by
<CODE
CLASS="parameter"
>charset</CODE
>, whilst the counterpart
<A
HREF="function.substr.html"
><B
CLASS="function"
>substr()</B
></A
> always takes these for byte offsets.
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN85069"
></A
><H2
>返回值</H2
><P
> Returns the portion of <CODE
CLASS="parameter"
>str</CODE
> specified by the
<CODE
CLASS="parameter"
>offset</CODE
> and <CODE
CLASS="parameter"
>length</CODE
> parameters.
</P
><P
> If <CODE
CLASS="parameter"
>str</CODE
> is shorter than <CODE
CLASS="parameter"
>offset</CODE
>
characters long, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> will be returned.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN85079"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.substr.html"
><B
CLASS="function"
>substr()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mb-substr.html"
><B
CLASS="function"
>mb_substr()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mb-strcut.html"
><B
CLASS="function"
>mb_strcut()</B
></A
></TD
></TR
></TBODY
></TABLE
><P
></P
>
</P
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