(PHP 4 >= 4.1.0, PHP 5 <= 5.0.5, PECL dbx >= 1.1.0)

dbx_compare — Compare two rows for sorting purposes


int dbx_compare ( array $row_a , array $row_b , string $column_key [, int $flags = DBX_CMP_ASC | DBX_CMP_NATIVE ] )

dbx_compare() is a helper function for dbx_sort() to ease the make and use of the custom sorting function.

Список параметров

row_a -

First row

row_b -

Second row

column_key -

The compared column

flags -

The flags can be set to specify comparison direction:

  • DBX_CMP_ASC - ascending order
  • DBX_CMP_DESC - descending order
and the preferred comparison type:
  • DBX_CMP_NATIVE - no type conversion
  • DBX_CMP_TEXT - compare items as strings
  • DBX_CMP_NUMBER - compare items numerically
One of the direction and one of the type constant can be combined with bitwise OR operator (|).

Возвращаемые значения

Returns 0 if the row_a[$column_key] is equal to row_b[$column_key], and 1 or -1 if the former is greater or is smaller than the latter one, respectively, or vice versa if the flag is set to DBX_CMP_DESC.


Пример #1 dbx_compare() example
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

Смотрите также

  • dbx_sort() - Sort a result from a dbx_query by a custom sort function

Описание на ru2.php.net
Описание на php.ru




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