Why does the keys of PDO query() result contain tablename? - php

Question

I connected mysql with PDO like this:
$servername = 'localhost';
$servername = 'localhost';
$dbname = 'atlas';
$table = 'homepage_pv';
$username = 'root';
$password = 'mysql';
$conn = null;
try {
$conn = new PDO(
"mysql:host=$servername;dbname=$dbname",
$username,
$password,
array(
PDO::ATTR_PERSISTENT => true,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
)
);
}
catch(PDOException $e) {
echo "connect to mysql failed : " . $e->getMessage();
$conn = null;
exit;
}
$result = $conn->query('SELECT * from homepage_pv')->fetchAll(PDO::FETCH_NAMED);
echo "result=" . json_encode($result);
the result is :
result=[{"homepage_pv.id":"1","homepage_pv.datetime":"2019-08-19 22:56:26"},{"homepage_pv.id":"2","homepage_pv.datetime":"2019-08-19 22:56:28"},{"homepage_pv.id":"3","homepage_pv.datetime":"2019-08-19 23:01:58"}]
The keys contain the table name "homepage_pv" , which is not expected;
But where I create PDO like this :
try {
$conn = new PDO(
"mysql:host=$servername;",
...
);
}
...
$result = $conn->query('SELECT * from atlas.homepage_pv')->fetchAll(PDO::FETCH_NAMED);
echo "result=" . json_encode($result);
the keys in the result do not contain tablename any more, like this:
result=[{"id":"1","datetime":"2019-08-19 22:56:26"},{"id":"2","datetime":"2019-08-19 22:56:28"},{"id":"3","datetime":"2019-08-19 23:01:58"},{"id":"4","datetime":"2019-08-19 23:08:48"}]
In case1 , I specified dbname when creating PDO and leaved out it when doing query;
In case2 , it's is on the contrary;
So what cause it? how can I specify dbname when creating PDO without the keys in result containing tablename?

Answer 1

Use PDO::FETCH_ASSOC in fetchAll(). If you use PDO::FETCH_NAMED it will return with alias name. If alias not present then with the table name. Attaching the doc for your further reference.