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