PHP | imagettfbbox() Function

Last Updated : 28 Apr, 2025

The imagettfbbox() function is an inbuilt function in PHP that is used to calculate the bounding box in pixels for a TrueType text.
Syntax:

array imagettfbbox( float $size, float $angle, 
                 string $fontfile, string $text)

Parameters: This function accepts four parameters as mentioned above and described below:

$size: It specifies the font size in points.
$angle: It specifies the angle in degrees in which text will be measured.
$fontfile: It specifies the font filename.
$text: It specifies the string to be measured.

Return Value: This function returns an array on success.
Below examples illustrate the imagettfbbox() function in PHP:
Example 1:

php

<?php

// Create bounding box with local font file
$bbox = imagettfbbox(100, 100,
       './Pacifico.ttf', 'GeeksforGeeks');

// Print the boundbox data
print("<pre>".print_r($bbox, true)."</pre>");
?>

Output:

Array
(
    [0] => 47
    [1] => -13
    [2] => -91
    [3] => -806
    [4] => -264
    [5] => -776
    [6] => -124
    [7] => 17
)

Example 2:

php

<?php

// Create a image
$im = imagecreatetruecolor(800, 250);

// Set the background to be light blue
imagefilledrectangle($im, 0, 0, 800, 299, 
            imagecolorallocate($im, 255, 0, 100));

// Create bounding box with local font file
$bbox = imagettfbbox(10, 0,
            './Pacifico.ttf', 'GeeksforGeeks');

// Calculate coordinates using bounding box
$x = $bbox[0] + 130;
$y = $bbox[1] + 130;

// Add text
imagettftext($im, 50, 0, $x, $y, 
        imagecolorallocate($im, 0, 150, 0), 
        './Pacifico.ttf', 'GeeksforGeeks');

// Output to browser
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>