Writing text to an image using php - php

Question

I have this task working great! I have successfully wrote text to an image then displayed the image using php, however the problem I'm running into is getting the font size perfect and to fit within a contained area. Im using imagettftext()
I'm getting this to work however when i move the text to the desired location im manually changing the font to then get it to fit. I would like to text to perfectly fill a "box" inside the image.
Here is my code
Main.php
check out the promo code below<br />
<img src="imagem.php?promo=DISH120" alt="" />
imagem.php
$font = 'font-type.ttf';
$rImg = ImageCreateFromJPEG( "test.jpg" );
$color = imagecolorallocate($rImg, 255, 255, 255);
imagettftext($rImg, 20, 0, 660, 130, $color, $font, urldecode($_GET['promo']));
header('Content-type: image/jpeg');
imagejpeg($rImg, NULL,100);
Here is the image im writing
i want the text to write to the bottom right next to code, however when i make the font big enough to match the CODE height it way to wide.
ADDITION
<?php
function makeTextBlock($text, $fontfile, $fontsize, $width)
{
$words = explode(' ', $text);
$lines = array($words[0]);
$currentLine = 0;
for($i = 1; $i < count($words); $i++)
{
$lineSize = imagettfbbox($fontsize, 0, $fontfile, $lines[$currentLine] . ' ' . $words[$i]);
if($lineSize[2] - $lineSize[0] < $width)
{
$lines[$currentLine] .= ' ' . $words[$i];
}
else
{
$currentLine++;
$lines[$currentLine] = $words[$i];
}
}
return implode("\n", $lines);
}
?>
I found this function re formats a text string into a text block of a given width, this is kinda what im trying to achieve however, im not sure how to integrate this. I want a box which width and height never change that will be filled with text that its character count will change.

Answer 1

This sounds like an issue with the font you're using. Try to make sure that the font matches the font of the text in the image, so that when you increase the size of the font to fit the image, it doesn't go too wide.
Other things I'd point out:
Based on what you're doing, I don't recommend a $_GET parameter.
You should remove the image from memory once you're done with it, like this: imagedestroy($rImg);