PHP mysqli_query() Function

The mysqli_query() function accepts a string value representing a query as one of the parameters and, executes/performs the given query on the database.
mysqli_query($con, query)

con(Mandatory)
This is an object representing a connection to MySQL Server.
query(Mandatory)
This is a string value representing the query to be executed.
mode(Optional)
This is a integer value representing the result mode. You can pass MYSQLI_USE_RESULT  or MYSQLI_STORE_RESULT as values to this parameter.
For SELECT, SHOW, DESCRIBE and EXPLAIN queries this function returns a mysqli_result object holding the result of the query in case of success and, false if failed.
For other queries this function returns an boolean value  which is, true if the operation/query is successful and, false if not.
This function was first introduced in PHP Version 5 and works works in all the later versions.
Following example demonstrates the usage of the mysqli_query() function (in procedural style) −
<?php
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   mysqli_query($con, "CREATE TABLE IF NOT EXISTS my_team(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created ..."."\n");

   //Inserting a records into the my_team table
   mysqli_query($con, "insert into my_team values(1, 'Shikhar', 'Dhawan', 'Delhi', 'India')");
   mysqli_query($con, "insert into my_team values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   mysqli_query($con, "insert into my_team values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
   mysqli_query($con, "insert into my_team values(4, 'Virat', 'Kohli', 'Delhi', 'India')");

   print("Records Inserted ..."."\n");
  
   //Closing the connection
   mysqli_close($con);
?>
This will produce following result −
Table Created ...
Records Inserted ...

If you observe the contents of the table in the database you can see the inserted records as shown below −
mysql> select * from my_team;
+------+------------+------------+----------------+-------------+
| ID   | First_Name | Last_Name  | Place_Of_Birth | Country     |
+------+------------+------------+----------------+-------------+
|    1 | Shikhar    | Dhawan     | Delhi          | India       |
|    2 | Jonathan   | Trott      | CapeTown       | SouthAfrica |
|    3 | Kumara     | Sangakkara | Matale         | Srilanka    |
|    4 | Virat      | Kohli      | Delhi          | India       |
+------+------------+------------+----------------+-------------+
4 rows in set (0.00 sec)

In object oriented style the syntax of this function is $con->query(); Following is the example of this function in object oriented style $minus;
<?php
   $con = new mysqli("localhost", "root", "password", "mydb");

   //Inserting a records into the players table
   $con->query("CREATE TABLE IF NOT EXISTS players(First_Name VARCHAR(255), Last_Name VARCHAR(255), Country VARCHAR(255))");
   $con->query("insert into players values('Shikhar', 'Dhawan', 'India')");
   $con->query("insert into players values('Jonathan', 'Trott', 'SouthAfrica')");

   print("Data Created......");
   //Closing the connection
   $res = $con -> close();
?>
This will produce following result −
Data Created......

If you observe the contents of the table in the database you can see the inserted records as shown below −
mysql> select * from players;
+------------+-----------+-------------+
| First_Name | Last_Name | Country     |
+------------+-----------+-------------+
| Shikhar    | Dhawan    | India       |
| Jonathan   | Trott     | SouthAfrica |
+------------+-----------+-------------+
2 rows in set (0.00 sec)
Following example prints the results of INSERT and SELECT queries −
<?php
   //Creating a connection
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   mysqli_query($con, "CREATE TABLE IF NOT EXISTS my_team(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created ..."."\n");

   //Inserting a records into the my_team table
   $res = mysqli_query($con, "insert into my_team values(1, 'Shikhar', 'Dhawan', 'Delhi', 'India')");
   print("Result of Insert Query: ".$res."\n");
   $res = mysqli_query($con, "insert into my_team values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   print("Result of Insert Query: ".$res);

   $res = mysqli_query($con, "SELECT * FROM my_team");
   print("Result of the SELECT query: ");
   print_r($res);

   //Closing the connection
   mysqli_close($con);
?>
This will produce following result −
Table Created ...
Result of Insert Query: 1
Result of Insert Query: 1Result of the SELECT query: mysqli_result Object
(
    [current_field] => 0
    [field_count] => 5
    [lengths] =>
    [num_rows] => 2
    [type] => 0
)

Assume we have created a table players in the database and populated it, as shown below −
CREATE TABLE Players (Name VARCHAR(255), Age INT, Score INT);
   insert into Players values('Dhavan', 33, 90),('Rohit', 28, 26),('Kohli', 25, 50);
Following example retrieves the resultset from a 
mysqli_multi_query
<?php
   //Creating a connection
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   //Executing the multi query
   $query = "SELECT * FROM players";
 
   //Retrieving the records
   $res = mysqli_query($con, $query, MYSQLI_USE_RESULT);
   if ($res) {
      while ($row = mysqli_fetch_row($res)) {
         print("Name: ".$row[0]."\n");
         print("Age: ".$row[1]."\n");
      }
   }

   //Closing the connection
   mysqli_close($con);
?>
This will produce following result −
Name: Dhavan
Age: 33
Name: Rohit
Age: 28
Name: Kohli
Age: 25


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