dbx_sort

(PHP 4 >= 4.0.6, PHP 5 <= 5.0.5, PECL dbx >= 1.1.0)

dbx_sort — Sort a result from a dbx_query by a custom sort function

说明

bool dbx_sort ( object $result , string $user_compare_function )

Sort a result from a dbx_query() call with a custom sort function.

参数

result: A result set returned by dbx_query() .
user_compare_function: The user-defined comparison function. It must accept two arguments and return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

返回值

成功时返回 TRUE ，或者在失败时返回 FALSE 。

范例

Example #1 dbx_sort() example

  <?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 tbl ORDER BY id" );
     // data in $result is now ordered by id

 dbx_sort ( $result ,  "user_re_order" );
     // data in $result is now ordered by parentid (descending), then by id

 dbx_close ( $link );
 ?>

注释

Note:

It is always better to use ORDER BY SQL clause instead of dbx_sort() if possible.

参见

dbx_compare() - Compare two rows for sorting purposes