equvalance for IF NOT EXISTS in mysql code example

Example 1: php mysql if not exists insert

$mysqli = new mysqli(SERVER, DBUSER, DBPASS, DATABASE);
$result = $mysqli->query("SELECT id FROM mytable WHERE city = 'c7'");
if($result->num_rows == 0) {
     // row not found, do stuff...
} else {
    // do other stuff...
}
$mysqli->close();

Example 2: mysql insert if not exists

INSERT IGNORE INTO companies
    (id, full_name, address, phone_number)
VALUES
    (1, 'Apple', '1 Infinite Loop, Cupertino, California', 18002752273);