How to Retrieve the Last Inserted ID in PHP Using PDO?

Retrieving the Last Inserted ID with PDO

Issue:

Many beginners face an error while attempting to retrieve the last inserted ID using LAST_INSERT_ID(), resulting in the fatal error "Call to undefined function LAST_INSERT_ID()." This error arises from the misconception that LAST_INSERT_ID() is a PHP function, when in reality it's an SQL function.

Solution with PDO:

The correct method to retrieve the last inserted ID using PDO is through the lastInsertId() method:

$stmt = $db->prepare("...");
$stmt->execute();
$id = $db->lastInsertId();

Solution with SQL:

$stmt = $db->query("SELECT LAST_INSERT_ID()");
$lastId = $stmt->fetchColumn();

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