Is "last_inserted()" a built-in PHP function?

No, "last_inserted()" is not a built-in PHP function. To retrieve the last inserted ID in PHP after performing an INSERT query, you can use the mysqli_insert_id() function if you are using MySQLi or the PDO::lastInsertId() method if you are using PDO. 

// Using MySQLi
$mysqli = new mysqli("localhost", "username", "password", "database");
// Perform your INSERT query here
$last_inserted_id = $mysqli->insert_id;

// Using PDO
$pdo = new PDO("mysql:host=localhost;dbname=database", "username", "password");
// Perform your INSERT query here
$last_inserted_id = $pdo->lastInsertId();

Keywords

last_inserted PHP function built-in library

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