Oracle 5.0 Reference Manual page 2720

Mysqlnd query result cache plugin (mysqlnd_qc)
$mysqli = new mysqli("host", "user", "password", "schema", "port", "socket");
$mysqli->query("DROP TABLE IF EXISTS test");
$mysqli->query("CREATE TABLE test(id INT)");
$mysqli->query("INSERT INTO test(id) VALUES (1), (2)");
/* not cached */
$res = $mysqli->query("SELECT id FROM test WHERE id = 1");
var_dump($res->fetch_assoc());
$res->free();
/* cache put */
$res = $mysqli->query("/*" . MYSQLND_QC_ENABLE_SWITCH . "*/" . "SELECT id FROM test WHERE id = 2");
var_dump($res->fetch_assoc());
$res->free();
/* cache hit */
$res = $mysqli->query("/*" . MYSQLND_QC_ENABLE_SWITCH . "*/" . "SELECT id FROM test WHERE id = 2");
var_dump($res->fetch_assoc());
$res->free();
var_dump(mysqlnd_qc_get_query_trace_log());
?>
The above examples will output:
array(1) {
["id"]=>
string(1) "1"
}
array(1) {
["id"]=>
string(1) "2"
}
array(1) {
["id"]=>
string(1) "2"
}
array(6) {
[0]=>
array(8) {
["query"]=>
string(25) "DROP TABLE IF EXISTS test"
["origin"]=>
string(102) "#0 qc.php(4): mysqli->query('DROP TABLE IF E...')
#1 {main}"
["run_time"]=>
int(0)
["store_time"]=>
int(0)
["eligible_for_caching"]=>
bool(false)
["no_table"]=>
bool(false)
["was_added"]=>
bool(false)
["was_already_in_cache"]=>
bool(false)
}
[1]=>
array(8) {
["query"]=>
string(25) "CREATE TABLE test(id INT)"
["origin"]=>
string(102) "#0 qc.php(5): mysqli->query('CREATE TABLE te...')
#1 {main}"
["run_time"]=>
int(0)
["store_time"]=>
int(0)
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