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<?php

// Create connection
$con = mysqli_connect("localhost", "username", "password", "dbname");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* Create table doesn't return a resultset */
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
    printf("Table myCity successfully created.\n" );
}

/* Select queries return a resultset */
if ($result = mysqli_query($con , "SELECT Name FROM City LIMIT 10")) {
    printf("Select returned %d rows.\n", mysqli_num_rows($result));
    while ( $results = mysqli_fetch_row($qeury) ) 
	{
       // logic here
	   
    } // End of while loop 

    /* free result set */
    mysqli_free_result($result);
}

/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = mysqli_query($con , "SELECT * FROM City", MYSQLI_USE_RESULT)) {

    /* 
    Note, that we can't execute any functions which interact with the
       server until result set was closed. All calls will return an
       'out of sync' error 
    */
    if (!mysqli_query($con , "SET @a:='this will not work'")) {
        printf("Error: %s\n", mysqli_error($con));
    }
    mysqli_free_result($result);
}

mysqli_close($con);