'What's the PostgreSQL equivalent of $mysqli->connect_error?

If mysqli error is thrown while connecting to database, it could be detected as below.

if ($mysqli->connect_error) {
    $this->Session->setFlash(__('Cannot Connect to the host'));
    return;
}

connect_error does not exist for PostgreSQL.

How could I do this in PostgreSQL? How can I catch the connect error?

php postgresql

Solution 1:^[1]

Use PDO to connect to PostgreSQL. It will throw an exception on connect error, which is way better than manual checking.

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Solution	Source
Solution 1	Your Common Sense