$str = "This is a string";
$str = $str . " with some more text";
$str .= " and a newline at the end.\n";
$num = 9;
$str = "Number: $num
";
$num = 9;
$str = 'Number: $num
';
$str = 'This is a test.';
$first = $str[0];
$str = 'This is still a test.';
$last = $str[strlen($str)-1];
?>