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

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><H1
><A
NAME="function.dbx-compare"
></A
>dbx_compare</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN35167"
></A
><P
>    (PHP 4 &#62;= 4.1.0, PHP 5 &#60;= 5.0.4)</P
>dbx_compare&nbsp;--&nbsp;Compare two rows for sorting purposes</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN35170"
></A
><H2
>说明</H2
>int <B
CLASS="methodname"
>dbx_compare</B
> ( array row_a, array row_b, string column_key [, int flags] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>dbx_compare()</B
> is a helper function for 
   <A
HREF="function.dbx-sort.html"
><B
CLASS="function"
>dbx_sort()</B
></A
> to ease the make and use of the custom 
   sorting function.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN35190"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>row_a</CODE
></DT
><DD
><P
>&#13;       First row
      </P
></DD
><DT
><CODE
CLASS="parameter"
>row_b</CODE
></DT
><DD
><P
>&#13;       Second row
      </P
></DD
><DT
><CODE
CLASS="parameter"
>column_key</CODE
></DT
><DD
><P
>&#13;       The compared column
      </P
></DD
><DT
><CODE
CLASS="parameter"
>flags</CODE
></DT
><DD
><P
>&#13;       The <CODE
CLASS="parameter"
>flags</CODE
> can be set to specify comparison
       direction: 
       <P
></P
><UL
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>DBX_CMP_ASC</B
></TT
> - ascending order
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>DBX_CMP_DESC</B
></TT
> - descending order
         </P
></LI
></UL
>
       and the preferred comparison type:
       <P
></P
><UL
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>DBX_CMP_NATIVE</B
></TT
> - no type conversion
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>DBX_CMP_TEXT</B
></TT
> - compare items as strings
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>DBX_CMP_NUMBER</B
></TT
> - compare items numerically
         </P
></LI
></UL
>
       One of the direction and one of the type constant can be combined with
       bitwise OR operator (|). The default value for the 
       <CODE
CLASS="parameter"
>flags</CODE
> parameter is 
       <TT
CLASS="constant"
><B
>DBX_CMP_ASC</B
></TT
> | <TT
CLASS="constant"
><B
>DBX_CMP_NATIVE</B
></TT
>.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN35235"
></A
><H2
>返回值</H2
><P
>&#13;   Returns <TT
CLASS="literal"
>0</TT
> if the <TT
CLASS="literal"
>row_a[$column_key]</TT
>
   is equal to <TT
CLASS="literal"
>row_b[$column_key]</TT
>, and <TT
CLASS="literal"
>1</TT
>
   or <TT
CLASS="literal"
>-1</TT
> if the former is greater or is smaller than the 
   latter one, respectively, or vice versa if the <CODE
CLASS="parameter"
>flag</CODE
> 
   is set to <TT
CLASS="constant"
><B
>DBX_CMP_DESC</B
></TT
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN35245"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN35248"
></A
><P
><B
>例 1. <B
CLASS="function"
>dbx_compare()</B
> example</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">user_re_order</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">$b</font><font color="#007700">) <br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$rv </font><font color="#007700">= </font><font color="#0000BB">dbx_compare</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">$b</font><font color="#007700">, </font><font color="#DD0000">"parentid"</font><font color="#007700">, </font><font color="#0000BB">DBX_CMP_DESC</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;if (!</font><font color="#0000BB">$rv</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$rv </font><font color="#007700">= </font><font color="#0000BB">dbx_compare</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">$b</font><font color="#007700">, </font><font color="#DD0000">"id"</font><font color="#007700">, </font><font color="#0000BB">DBX_CMP_NUMBER</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">$rv</font><font color="#007700">;<br />}<br /><br /></font><font color="#0000BB">$link&nbsp;&nbsp;&nbsp;</font><font color="#007700">= </font><font color="#0000BB">dbx_connect</font><font color="#007700">(</font><font color="#0000BB">DBX_ODBC</font><font color="#007700">, </font><font color="#DD0000">""</font><font color="#007700">, </font><font color="#DD0000">"db"</font><font color="#007700">, </font><font color="#DD0000">"username"</font><font color="#007700">, </font><font color="#DD0000">"password"</font><font color="#007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;or die(</font><font color="#DD0000">"Could not connect"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">dbx_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"SELECT id, parentid, description FROM table ORDER BY id"</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// data in $result is now ordered by id<br /><br /></font><font color="#0000BB">dbx_sort</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">, </font><font color="#DD0000">"user_re_order"</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// date in $result is now ordered by parentid (descending), then by id<br /><br /></font><font color="#0000BB">dbx_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></DIV
></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN35252"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><TBODY
><TR
><TD
><A
HREF="function.dbx-sort.html"
><B
CLASS="function"
>dbx_sort()</B
></A
></TD
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><P
></P
>
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