what is prepared statement in php code example

Example 1: mysqli_connect using prepare statement

$stmt = $mysqli->prepare("INSERT INTO myTable (name, age) VALUES (?, ?)");
$stmt->bind_param("si", $_POST['name'], $_POST['age']);
$stmt->execute();
$stmt->close();
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Example 2: php my sql prepare bind param with multiple statements

$array_of_values = array( "Brasil", "Argentina" );
$types = "ss";
$mysqli_stmt->bind_param( $types, ...$array_of_values );