Text position is not coming in footer left - php

Question

Please check my code -
<?php
function watermarkImage ($SourceFile, $WaterMarkText, $DestinationFile) {
list($width, $height) = getimagesize($SourceFile);
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($SourceFile);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width, $height);
$black = imagecolorallocate($image_p, 0, 0, 0);
$font = 'dum13d100.ttf';
$font_size = 10;
imagettftext($image_p, $font_size, 0, 10, 20, $black, $font, $WaterMarkText);
if ($DestinationFile<>'') {
imagejpeg ($image_p, $DestinationFile, 100);
} else {
header('Content-Type: image/jpeg');
imagejpeg($image_p, null, 100);
};
imagedestroy($image);
imagedestroy($image_p);
}
$SourceFile = 'myimage.jpg';
$DestinationFile = 'images/myimage2.jpg';
$WaterMarkText = 'CHINMAY';
watermarkImage ($SourceFile,$WaterMarkText,$DestinationFile);
?>
Original Source code -
http://www.learnphp.in/index.php?page=forum&op=viewThread&id=687
Above code is showing -
I want to -
The above image height is 280px
I have increased my text height 250($y angel) from top check below code-
imagettftext($image_p, $font_size, 0, 10, 250, $black, $font, $WaterMarkText);
It works fine but my question is if someone upload 800px or more size image the text will not showing in footer it comes 250px from top.
I need to my watermark image will show padding-button:20px from left of the image.
Please anybody help me how to make height dynamic?

Answer 1

Change your line
imagettftext($image_p, $font_size, 0, 10, 20, $black, $font, $WaterMarkText);
to
imagettftext($image_p, $font_size, 0, 10, $height - 20, $black, $font, $WaterMarkText);

Answer 2

You can calculate the height of the image using getimagesize() (key index 1 being the height) then pad from the bottom by taking 20 away from the height.
$height = getimagesize($image)[1];
imagettftext($image_p, $font_size, 0, 10, $height - 20, $black, $font, $WaterMarkText);