(PHP 4 >= 4.1.0, PHP 5 <= 5.0.5, PECL dbx >= 1.1.0)
dbx_compare — Compare two rows for sorting purposes
$row_a
, array $row_b
, string $column_key
[, int $flags = DBX_CMP_ASC | DBX_CMP_NATIVE
] )dbx_compare() is a helper function for dbx_sort() to ease the make and use of the custom sorting function.
row_a
First row
row_b
Second row
column_key
The compared column
flags
The flags can be set to specify comparison
direction:
DBX_CMP_ASC - ascending order
DBX_CMP_DESC - descending order
DBX_CMP_NATIVE - no type conversion
DBX_CMP_TEXT - compare items as strings
DBX_CMP_NUMBER - compare items numerically
Returns 0 if the row_a[$column_key]
is equal to row_b[$column_key], and 1
or -1 if the former is greater or is smaller than the
latter one, respectively, or vice versa if the flag
is set to DBX_CMP_DESC.
Example #1 dbx_compare() example
<?php
function user_re_order($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);
?>