dbx_compare

Description

int dbx_compare ( array row_a, array row_b, string column_key [, int flags])

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

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 (|). The default value for the flags parameter is DBX_CMP_ASC | DBX_CMP_NATIVE.

Пример 1. dbx_compare() 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 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); ?>

See also dbx_sort().