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>dbx_compare</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN13016"
></A
><P
> (PHP 4 >= 4.1.0)</P
>dbx_compare -- Compare two rows for sorting purposes</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN13019"
></A
><H2
>Description</H2
>int <B
CLASS="methodname"
>dbx_compare</B
> ( array row_a, array row_b, string column_key [, int flags])<BR
></BR
><P
> <B
CLASS="function"
>dbx_compare()</B
> 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
<TT
CLASS="parameter"
><I
>flag</I
></TT
> is set to <TT
CLASS="constant"
><B
>DBX_CMP_DESC</B
></TT
>.
<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
><P
> The <TT
CLASS="parameter"
><I
>flags</I
></TT
> can be set to specify comparison
direction:
<P
></P
><UL
><LI
><P
> <TT
CLASS="constant"
><B
>DBX_CMP_ASC</B
></TT
> - ascending order
</P
></LI
><LI
><P
> <TT
CLASS="constant"
><B
>DBX_CMP_DESC</B
></TT
> - descending order
</P
></LI
></UL
>
and the preferred comparison type:
<P
></P
><UL
><LI
><P
> <TT
CLASS="constant"
><B
>DBX_CMP_NATIVE</B
></TT
> - no type conversion
</P
></LI
><LI
><P
> <TT
CLASS="constant"
><B
>DBX_CMP_TEXT</B
></TT
> - compare items as strings
</P
></LI
><LI
><P
> <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
<TT
CLASS="parameter"
><I
>flags</I
></TT
> parameter is <TT
CLASS="constant"
><B
>DBX_CMP_ASC</B
></TT
>
| <TT
CLASS="constant"
><B
>DBX_CMP_NATIVE</B
></TT
>.
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></A
><P
><B
>Ejemplo 1. <B
CLASS="function"
>dbx_compare()</B
> example</B
></P
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><PRE
CLASS="php"
><?php
function user_re_order ($a, $b) {
$rv = dbx_compare ($a, $b, "parentid", DBX_CMP_DESC);
if ( !$rv ) {
$rv = dbx_compare ($a, $b, "id", DBX_CMP_NUMBER);
}
return $rv;
}
$link = dbx_connect (DBX_ODBC, "", "db", "username", "password")
or die ("Could not connect");
$result = dbx_query ($link, "SELECT id, parentid, description FROM table ORDER BY id");
// data in $result is now ordered by id
dbx_sort ($result, "user_re_order");
// date in $result is now ordered by parentid (descending), then by id
dbx_close ($link);
?></PRE
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><P
> See also <A
HREF="function.dbx-sort.html"
><B
CLASS="function"
>dbx_sort()</B
></A
>.
</P
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