PHP & MySQL - Get Last ID

The PHP mysqli_insert_id() function can be used to get the ID generated by an INSERT or UPDATE statements on a table with a column having the AUTO_INCREMENT attribute. In the case of a multiple-row INSERT statement, it returns the first automatically generated value that was successfully inserted.

Get Last ID - Object-oriented style

Consider a table called Employee which contains four columns: EmpID, Name, City, and Salary. The EmpID column of this table is an AUTO_INCREMENT field.

CREATE TABLE Employee (
  EmpID INT AUTO_INCREMENT PRIMARY KEY,
  Name VARCHAR(255) NOT NULL,
  City VARCHAR(100),
  Salary DECIMAL(18,2)
);

Assuming that the table contain no records at present. The example below demonstrates how to get the last id after performing insert operation using object-oriented style.

<?php
//establishing connection to the database
$mysqli = new mysqli("localhost", "user", "password", "database");
if ($mysqli->connect_errno) {
  echo "Failed to connect to MySQL: ". $mysqli->connect_error;
  exit();
}

//inserting first record
$query = "INSERT INTO Employee (Name, City, Salary) VALUES ('John', 'London', 2800)";
$mysqli->query($query);

//getting the last insert id
printf("New record has ID %d.\n", $mysqli->insert_id);

//inserting two records
$query = "INSERT INTO Employee (Name, City, Salary) VALUES ('Marry', 'Paris', 2750)";
$mysqli->query($query);
$query = "INSERT INTO Employee (Name, City, Salary) VALUES ('Jo', 'Amsterdam', 2900)";
$mysqli->query($query);

//getting the last insert id
printf("New record has ID %d.\n", $mysqli->insert_id);

//closing the connection
$mysqli->close();
?>

The output of the above code will be:

New record has ID 1.
New record has ID 3.

Get Last ID - Procedural style

The same can be achieved using procedural style with following script:

<?php
//establishing connection to the database
$mysqli = mysqli_connect("localhost", "user", "password", "database");
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: ". mysqli_connect_error();
  exit();
}

//inserting first record
$query = "INSERT INTO Employee (Name, City, Salary) VALUES ('John', 'London', 2800)";
mysqli_query($mysqli, $query);

//getting the last insert id
printf("New record has ID %d.\n", mysqli_insert_id($mysqli));

//inserting two records
$query = "INSERT INTO Employee (Name, City, Salary) VALUES ('Marry', 'Paris', 2750)";
mysqli_query($mysqli, $query);
$query = "INSERT INTO Employee (Name, City, Salary) VALUES ('Jo', 'Amsterdam', 2900)";
mysqli_query($mysqli, $query);

//getting the last insert id
printf("New record has ID %d.\n", mysqli_insert_id($mysqli));

//closing the connection
mysqli_close($mysqli);
?>

The output of the above code will be:

New record has ID 1.
New record has ID 3.

Complete PHP MySQLi Reference

For a complete reference of all properties, methods and functions of PHP MySQLi extension, see PHP MySQLi Reference.