How can PHP's graphic functions be utilized to determine the size of text output in True-Type format?

To determine the size of text output in True-Type format using PHP's graphic functions, you can use the `imagettfbbox()` function. This function calculates the bounding box of a text string using a specified TrueType font. By retrieving the coordinates of the bounding box, you can determine the width and height of the text output.

$text = 'Hello, World!';
$font = 'arial.ttf';
$size = 12;

$bbox = imagettfbbox($size, 0, $font, $text);

$textWidth = $bbox[2] - $bbox[0];
$textHeight = $bbox[1] - $bbox[7];

echo "Text width: $textWidth, Text height: $textHeight";