Building a PHP script to create new image - php

Question

I'm on my way to create a new script for my personal website. I want some kind of function where visitors can write something in an input field and then press generate image.
The script should then take a background image and insert the visitors text on top.
My question is: What is the php code to actually generate the image file and how do i connect the input data to the image?
I do not need full code examples if you don't have the time, i just need the basis practice of how to setup such a system.

Answer 1

Try this code:
$filename = "layout.jpg";
$im = #imagecreatefromjpeg($filename);
$font = "tahoma.ttf";
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
imagettftext($im, 15, 0, 50, 50, $black, $font, $_POST['message_from_user']);
header('Content-Type: image/jpeg');
imagejpeg($im, null, 100);
imagedestroy($im);
layout.jpg is background image, tahoma.ttf is font file
Both files should be placed in the same folder.
This code would generate jpg-image with user string.
More details you would get by searching "gd in php".

Answer 2

do something like this:
$text = 'put ur txt here';
$height = 25;
$width = 65;
$image_p = imagecreate($width, $height);
$black = imagecolorallocate($image_p, 0, 0, 0);
$white = imagecolorallocate($image_p, 255, 255, 255);
$font_size = 14;
imagestring($image_p, $font_size, 5, 5, $text, $white);
imagejpeg($image_p, 'file name here', 80);