gistfile1.txt

<?php
Header ("Content-type: image/jpeg");


function ImageTTFCenter($image, $text, $font, $size, $angle = 45) {
    $xi = imagesx($image);
    $yi = imagesy($image);

    $box = imagettfbbox($size, $angle, $font, $text);

    $xr = abs(max($box[2], $box[4]));
    $yr = abs(max($box[5], $box[7]));

    $x = intval(($xi - $xr) / 2);
    $y = intval(($yi + $yr) / 2);

    return array($x, $y);
}

$im = @imagecreatefrompng('someimage.png');

// Create some colors
$white = imagecolorallocate($im, 255, 255, 255);
$grey = imagecolorallocate($im, 128, 128, 128);
$black = imagecolorallocate($im, 0, 0, 0);
//imagefilledrectangle($im, 0, 0, 399, 29, $white);

// The text to draw
$text = $_GET["text"];

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

//image file name
//$name ="$fbid.png";
$name = $uploads_dir."test.png"; //this saves the image inside uploaded_files folder

list($x, $y) = ImageTTFCenter($im, $text, $font, 20);

// Add some shadow to the4 text
imagettftext($im, 20, 0, $x, $y+1, $grey, $font, $text);

// Add the text
imagettftext($im, 20, 0, $x, $y, $black, $font, $text);

// Using imagepng() results in clearer text compared with imagejpeg()
//imagepng($im);
ImageJPEG($im,null,100);
imagedestroy($im);