Question

This one is empty image before writing

Here is my code

<?php
function LoadJpeg($imgname)
{
    $im = @imagecreatefromjpeg($imgname);

    $grey = imagecolorallocate($im, 255, 255, 0);

    // The text to draw
    $text = 'http://www.stackoverflow.com';

    // Replace path by your own font path
    $font = 'CONSOLA.TTF';

    list($width, $height) = getimagesize($imgname);

    // wants to know how to use this width/height dynamically //

    imagettftext($im, 20, 45, 200, 450, $grey, $font, $text);

    return $im;
}

header('Content-Type: image/jpeg');

$img = LoadJpeg('Blue_hills.jpg');

imagejpeg($img);
imagedestroy($img);
?>

Image after writing text on it

What I want is vertically and horizontally center the text on 45 degree. Please help me on this. Thanks for you all.

Answer 1

Use the imagettfbbox function to retrieve the dimensions the text rendering would require. Then use that information to calculate the x,y coordinate you should target within the destination image for the text to be centered respective to the width/height.