(PHP 8 >= 8.4.0)
Pdo\Sqlite::createCollation — Registers a user-defined function for use as a collating function in SQL statements
This method is similar to Pdo\Sqlite::createFunction() except that it registers functions that are used to collate strings.
namecallback-1, 0, or 1
if the first string sorts before, sorts identically, or sorts after
the second string respectively.
An internal function that behaves like this is strcmp().
This function need to be defined as:
示例 #1 Pdo\Sqlite::createCollation() example
<?php
$db = new Pdo\Sqlite('sqlite::memory:');
$db->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";
}
?>以上示例会输出：
a1 a10 a2 a1 a2 a10