PHP mysqli_insert_id() Function

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Definition and Usage

If you have a table with an AUTO_INCREMENT attribute for a column and, if your last MySQLi function call executes INSERT or UPDATE statement. The mysqli_insert_id() function returns the auto generated id of the last executed query.

Syntax

mysqli_insert_id($con)

Parameters

Return Values

PHP mysqli_insert_id() function returns the value of the "Auto Increment" column in the last query In case it is INSERT or, UPDATE operation. If the last executed query is not INSERT or, UPDATE or, if the table doesn't have any column/field with "AUTO_INCREMENT" attribute, this function returns 0.

PHP Version

This function was first introduced in PHP Version 5 and works works in all the later versions.

Assume we have created a table named Cricketers in the database mydb, where the field ID is PRIMARY KEY and it is AUTO INCREMENTED as −

CREATE TABLE Cricketers(
   ID INT PRIMARY KEY AUTO_INCREMENT,
   First_Name VARCHAR(255), 
   Last_Name VARCHAR(255), 
   Date_Of_Birth date, 
   Place_Of_Birth VARCHAR(255), 
   Country VARCHAR(255)
);

Example

Following example demonstrates the usage of the mysqli_insert_id() function (in procedural style) −

<?php
   //Creating a connection
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   //Inserting a record into the employee table
   $sql = "insert into Cricketers values(1, 'Shikhar', 'Dhawan', DATE('1981-12-05'), 'Delhi', 'India')";
   mysqli_query($con, $sql);
   //Insert ID
   $id = mysqli_insert_id($con);
   print("Insert ID: ".$id ."\n");

   $sql = "insert into Cricketers values(2, 'Jonathan', 'Trott', DATE('1981-04-22'), 'CapeTown', 'SouthAfrica')";
   mysqli_query($con, $sql);
   $id = mysqli_insert_id($con);
   print("Insert ID: ".$id);

   //Closing the connection
   mysqli_close($con);
?>

This will produce following result −

Insert ID: 1
Insert ID: 2

Example

In object oriented style the syntax of this function is $con->insert_id(); Following is the example of this function in object oriented style $minus;

<?php
   //Creating a connection
   $con = new mysqli("localhost", "root", "password", "mydb");

   //Inserting a record into the employee table
   $con -> query("insert into Cricketers values(3, 'Kumara', 'Sangakkara', DATE('1977-10-27'), 'Matale', 'Srilanka')");
   //Insert ID
   $state = $con->insert_id;
   print("Insert ID: ".$state."\n");

   //Inserting a record into the employee table
   $con -> query("insert into Cricketers values(4, 'Virat', 'Kohli', DATE('1988-11-05'), 'Delhi', 'India')");
   //Insert ID
   $state = $con->insert_id;
   print("Insert ID: ".$state);

   //Closing the connection
   $con -> close();
?>

This will produce following result −

Insert ID: 3
Insert ID: 4

Example

Following is another example of the function mysqli_insert_id −

<?php
   //Creating a connection
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   //Query to SELECT all the rows of the Cricketers table
   mysqli_query($con, "SELECT * FROM Cricketers");
   print("Insert ID (select query): ".mysqli_insert_id($con)."\n");

   //Query to INSERT multiple rows into the Cricketers table
   mysqli_query($con, "INSERT INTO Cricketers VALUES (5, 'Rohit', 'Sharma', DATE('1987-04-30'), 'Nagpur', 'India'), (6, 'Ravindra', 'Jadeja', DATE('1988-12-06'), 'Nagpur', 'India') ");
   print("Insert ID: (multiple inserts) ".mysqli_insert_id($con)."\n");

   //Query to UPDATE the rows of the employee table
   mysqli_query($con, "UPDATE Cricketers set COUNTRY = 'S.Africa' where ID = 2");
   print("Insert ID (update query): ".mysqli_insert_id($con)."\n");

   //Query to INSERT a record into the employee table
   mysqli_query($con, "INSERT INTO employee VALUES ('Sarmista', 'Sharma', 28, 'F', 15000,  101)");
   print("Insert ID: (table with out auto incremented key) ".mysqli_insert_id($con)."\n");

   //Closing the connection
   mysqli_close($con);
?>

This will produce following result −

Insert ID (select query): 0
Insert ID: (multiple inserts) 6
Insert ID (update query): 0
Insert ID: (table with out auto incremented key) 0

Example

Following example demonstrates the usage of the mysqli_insert_id function with SELECT, UPDATE, INSERT and, DELETE queries −

<?php
   $connection_mysql = mysqli_connect("localhost", "root", "password", "mydb");
   
   if (mysqli_connect_errno($connection_mysql)){
      echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }
   
   mysqli_query($connection_mysql,"INSERT INTO Employee (name) VALUES('PHP')");
   echo "New record has id: " . mysqli_insert_id($connection_mysql); 
   
   mysqli_close($connection_mysql);
?>

This will produce following result −

New record has id: 0