dbx_compare
(PHP 4 >= 4.1.0, PHP 5)
dbx_compare -- Compare two rows for sorting purposes
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:
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.
例子 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().