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

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>substr_count</H1
><DIV
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><A
NAME="AEN228455"
></A
><P
>    (PHP 4, PHP 5)</P
>substr_count&nbsp;--&nbsp;Count the number of substring occurrences</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228458"
></A
><H2
>说明</H2
>int <B
CLASS="methodname"
>substr_count</B
> ( string haystack, string needle [, int offset [, int length]] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>substr_count()</B
> returns the number of times the
   <CODE
CLASS="parameter"
>needle</CODE
> substring occurs in the
   <CODE
CLASS="parameter"
>haystack</CODE
> string. Please note that
   <CODE
CLASS="parameter"
>needle</CODE
> is case sensitive.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    This function doesn't count overlapped substrings. See the example below!
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228482"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>haystack</CODE
></DT
><DD
><P
>&#13;       The string to search in
      </P
></DD
><DT
><CODE
CLASS="parameter"
>needle</CODE
></DT
><DD
><P
>&#13;       The substring to search for
      </P
></DD
><DT
><CODE
CLASS="parameter"
>offset</CODE
></DT
><DD
><P
>&#13;       The offset where to start counting
      </P
></DD
><DT
><CODE
CLASS="parameter"
>length</CODE
></DT
><DD
><P
>&#13;       The maximum length after the specified offset to search for the
       substring. It outputs a warning if the offset plus the length is
       greater than the <CODE
CLASS="parameter"
>haystack</CODE
> length.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228507"
></A
><H2
>返回值</H2
><P
>&#13;   This functions returns an <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228511"
></A
><H2
>更新日志</H2
><P
>&#13;   <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN228514"
></A
><TABLE
BORDER="1"
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><COL><COL><THEAD
><TR
><TH
>版本</TH
><TH
>说明</TH
></TR
></THEAD
><TBODY
><TR
><TD
>5.1.0</TD
><TD
>&#13;        Added the <CODE
CLASS="parameter"
>offset</CODE
> and
        the <CODE
CLASS="parameter"
>length</CODE
> parameters
       </TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228526"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN228529"
></A
><P
><B
>例 1. A <B
CLASS="function"
>substr_count()</B
> example</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$text </font><font color="#007700">= </font><font color="#DD0000">'This is a test'</font><font color="#007700">;<br />echo </font><font color="#0000BB">strlen</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">); </font><font color="#FF8000">// 14<br /><br /></font><font color="#007700">echo </font><font color="#0000BB">substr_count</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">, </font><font color="#DD0000">'is'</font><font color="#007700">); </font><font color="#FF8000">// 2<br /><br />// the string is reduced to 's is a test', so it prints 1<br /></font><font color="#007700">echo </font><font color="#0000BB">substr_count</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">, </font><font color="#DD0000">'is'</font><font color="#007700">, </font><font color="#0000BB">3</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// the text is reduced to 's i', so it prints 0<br /></font><font color="#007700">echo </font><font color="#0000BB">substr_count</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">, </font><font color="#DD0000">'is'</font><font color="#007700">, </font><font color="#0000BB">3</font><font color="#007700">, </font><font color="#0000BB">3</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// generates a warning because 5+10 &gt; 14<br /></font><font color="#007700">echo </font><font color="#0000BB">substr_count</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">, </font><font color="#DD0000">'is'</font><font color="#007700">, </font><font color="#0000BB">5</font><font color="#007700">, </font><font color="#0000BB">10</font><font color="#007700">);<br /><br /><br /></font><font color="#FF8000">// prints only 1, because it doesn't count overlapped subtrings<br /></font><font color="#0000BB">$text2 </font><font color="#007700">= </font><font color="#DD0000">'gcdgcdgcd'</font><font color="#007700">;<br />echo </font><font color="#0000BB">substr_count</font><font color="#007700">(</font><font color="#0000BB">$text2</font><font color="#007700">, </font><font color="#DD0000">'gcdgcd'</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228533"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><TR
><TD
><A
HREF="function.count-chars.html"
><B
CLASS="function"
>count_chars()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.strpos.html"
><B
CLASS="function"
>strpos()</B
></A
></TD
></TR
><TR
><TD
><A
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><B
CLASS="function"
>substr()</B
></A
></TD
></TR
><TR
><TD
><A
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><B
CLASS="function"
>strstr()</B
></A
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>
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