Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

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

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>strrpos</H1
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NAME="AEN228126"
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><P
>    (PHP 3, PHP 4, PHP 5)</P
>strrpos&nbsp;--&nbsp;
     Find position of last occurrence of a char in a string
    </DIV
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><H2
>Description</H2
>int <B
CLASS="methodname"
>strrpos</B
> ( string haystack, string needle [, int offset] )<BR
></BR
><P
>&#13;     Returns the numeric position of the last occurrence of
     <CODE
CLASS="parameter"
>needle</CODE
> in the
     <CODE
CLASS="parameter"
>haystack</CODE
> string.  Note that the needle in
     this case can only be a single character in PHP 4.  If a string is passed
     as the needle, then only the first character of that string will
     be used.
    </P
><P
>&#13;     If <CODE
CLASS="parameter"
>needle</CODE
> is not found, returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
>.
    </P
><P
>&#13;     It is easy to mistake the return values for "character found at
     position 0" and "character not found".  Here's how to detect
     the difference:
     <DIV
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><P
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#FF8000">// in PHP 4.0.0 and newer:<br /></font><font color="#0000BB">$pos </font><font color="#007700">= </font><font color="#0000BB">strrpos</font><font color="#007700">(</font><font color="#0000BB">$mystring</font><font color="#007700">, </font><font color="#DD0000">"b"</font><font color="#007700">);<br />if (</font><font color="#0000BB">$pos </font><font color="#007700">=== </font><font color="#0000BB">false</font><font color="#007700">) { </font><font color="#FF8000">// note: three equal signs<br />&nbsp;&nbsp;&nbsp;&nbsp;// not found...<br /></font><font color="#007700">}<br /><br /></font><font color="#FF8000">// in versions older than 4.0.0:<br /></font><font color="#0000BB">$pos </font><font color="#007700">= </font><font color="#0000BB">strrpos</font><font color="#007700">(</font><font color="#0000BB">$mystring</font><font color="#007700">, </font><font color="#DD0000">"b"</font><font color="#007700">);<br />if (</font><font color="#0000BB">is_bool</font><font color="#007700">(</font><font color="#0000BB">$pos</font><font color="#007700">) &amp;&amp; !</font><font color="#0000BB">$pos</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// not found...<br /></font><font color="#007700">}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
></P
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>
    </P
><P
>&#13;     If <CODE
CLASS="parameter"
>needle</CODE
> is not a string, it is converted
     to an integer and applied as the ordinal value of a character.
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      As of PHP 5.0.0 <CODE
CLASS="parameter"
>offset</CODE
> may
      be specified to begin searching an arbitrary number of characters into
      the string.  Negative values will stop searching at an arbitrary point
      prior to the end of the string.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      The <CODE
CLASS="parameter"
>needle</CODE
> may be a string of more than one
      character as of PHP 5.0.0.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <A
HREF="function.strpos.html"
><B
CLASS="function"
>strpos()</B
></A
>,
     <A
HREF="function.strripos.html"
><B
CLASS="function"
>strripos()</B
></A
>,
     <A
HREF="function.strrchr.html"
><B
CLASS="function"
>strrchr()</B
></A
>, 
     <A
HREF="function.substr.html"
><B
CLASS="function"
>substr()</B
></A
>,
     <A
HREF="function.stristr.html"
><B
CLASS="function"
>stristr()</B
></A
>, and
     <A
HREF="function.strstr.html"
><B
CLASS="function"
>strstr()</B
></A
>.
    </P
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