Trikotprinter

<?php

    if(!isset($_GET["bildtext"])) {
        echo 'Error';
        exit;
    }
    $pic_name = $_GET["bildtext"];
    $img = imagecreatefrompng ("imgsource/trikotblank.png");
    $text_color = imagecolorallocate($img, 18, 2, 2);                   //  Schriftfarbe
    $font_file = "fonts/masque.TTF";                             // Schriftart
    $font_size = 125;                                                        // Schriftgröße
    $text_x = 117;                                                          //  Pos X
    $text_y = 117;                                                          //  Pos Y
    imagettftext($img, $font_size, 0, ImageTTFCenter($img,$_POST["bildtext"],$font_file,$font_size), $text_y, $text_color, $font_file, $_POST["bildtext"]);
    imagepng($img, 'images/user/'.$pic_name.'.png');
    //imagedestroy($img);
    echo "<a href='http://$_SERVER[HTTP_HOST]/trikotprinter/images/user/$pic_name.png'>Profilbild von $pic_name</a>";
    function ImageTTFCenter($image, $text, $font, $size, $angle = 0)
    {
        $xi = imagesx($image);
        $box = imagettfbbox($size, $angle, $font, $text);
        $xr = abs(max($box[2], $box[4]));
        $x = intval(($xi - $xr) / 2);
        return $x;
    }
?>