Generate alphabetic character image with PHP

image.php

<?php
header("Content-Type: image/png");
$im = @imagecreate(16, 16)
or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 255, 255, 100);
$text_color = imagecolorallocate($im, 0, 195, 10);

imagestring($im, 5, 4, 0,  "A", $text_color);

imagepng($im);
imagedestroy($im); 
//https://www.php.net/manual/en/function.imagecreate.php