Output Text on Image using PHP imagettfbbox

<?php
$image_width 		= 	500; //image width
$image_height 		= 	150; //image height
$font_color			= 	array(0, 0, 0); //RGB color
$background_color	= 	array(152, 183, 236); //RGB Color
$font_size 			= 	10; //size of font
$text_rotation 		= 	0; //text rotation value
$margin_left		= 	10; //margin left
$margin_top			= 	20; //margin top
$font 				= 	'verdana.ttf'; //font path
$string				=	"This is the string\nwritten on the image.";

//create 300x300 pixel image
$new_image 	= imagecreatetruecolor($image_width, $image_height);

$font_color 			= imagecolorallocate($new_image, $font_color[0],$font_color[1],$font_color[2]);
$background_color 		= imagecolorallocate($new_image, $background_color[0],$background_color[1],$background_color[2]);

// Set background color
imagefilledrectangle($new_image, 0, 0, ($image_width-1), ($image_height-1),$background_color);

$Text = imagettfbbox(0, 0, $font, $string);
imagettftext($new_image, $font_size, $text_rotation, $margin_left, $margin_top, $font_color, $font, $string);

//output image
header('Content-Type: image/jpeg');
imagepng($new_image);
imagedestroy($new_image);
?>