Php/docs/function.dbx-compare

• PHP Manual
• dbx 函数
• Compare two rows for sorting purposes

dbx_compare

(PHP 4 >= 4.1.0, PHP 5 < 5.1.0, PECL dbx >= 1.1.0)

dbx_compare — Compare two rows for sorting purposes

说明

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

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

参数

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 (|).

返回值

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.

范例

Example #1 dbx_compare() example

<?phpfunction 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 $result is now ordered by iddbx_sort($result, "user_re_order");    // date in $result is now ordered by parentid (descending), then by iddbx_close($link);?>

参见

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