PDO::sqliteCreateCollation
Registers a User Defined Function for use as a collating function in SQL statements
&reftitle.description;
public boolPDO::sqliteCreateCollation
stringname
callablecallback
&warn.experimental.func;
&reftitle.parameters;
name
Name of the SQL collating function to be created or redefined.
callback
The name of a PHP function or user-defined function to apply as a callback, defining the behavior of the collation. It should accept two strings and return as strcmp() does, i.e. it should return -1, 1, or 0 if the first string sorts before, sorts after, or is equal to the second.
This function need to be defined as:
intcollation
stringstring1
stringstring2
&reftitle.returnvalues;
&return.success;
&reftitle.examples;
<function>PDO::sqliteCreateCollation</function> example
exec("CREATE TABLE test (col1 string)");
$db->exec("INSERT INTO test VALUES ('a1')");
$db->exec("INSERT INTO test VALUES ('a10')");
$db->exec("INSERT INTO test VALUES ('a2')");
$db->sqliteCreateCollation('NATURAL_CMP', 'strnatcmp');
foreach ($db->query("SELECT col1 FROM test ORDER BY col1") as $row) {
echo $row['col1'] . "\n";
}
echo "\n";
foreach ($db->query("SELECT col1 FROM test ORDER BY col1 COLLATE NATURAL_CMP") as $row) {
echo $row['col1'] . "\n";
}
?>
]]>
&example.outputs;