Watermarking: Display the same text on multiple parts of the image - php

Question

I want to add a text to a image. The text should be displayed in multiple areas of the image (not just one).
For example I want to watermark with a text stack. Stack should be displayed in the image at least 8 times in different areas in the image.
I just learned about imagestring() and imagettftext(), but these two only displays my text on a single spot.
Image is not fixed size, so i cannot specify exact and multiple location in advance. It should work on all sizes of images
<?php
/*
image.php
*/
header("Content-type: image/jpeg");
$imgPath = 'olximage.jpg';
$image = imagecreatefromjpeg($imgPath);
$color = imagecolorallocate($image, 255, 255, 255);
$string = "stack overflow";
$fontSize = 3;
$x = 15;
$y = 185;
imagestring($image, $fontSize, $x, $y, $string, $color);
$x = 15;
$y = 175;
imagestring($image, $fontSize, $x, $y, $string, $color);
imagejpeg($image);
?>
Thanks in advance

Answer 1

For example:
<?php
/*
image.php
*/
header("Content-type: image/jpeg");
$imgPath = 'olximage.jpg';
$image = imagecreatefromjpeg($imgPath);
$color = imagecolorallocate($image, 255, 255, 255);
$string = "stack overflow";
$fontSize = 3;
$imageHeight = imagesy($image);
$distanceY = 10;
$maxImageStrings = max(8, $imageHeight / $distanceY);
$x = 15;
for ($i = 0; $i < $maxImageStrings; $i++) {
$y = $i * $distanceY;
imagestring($image, $fontSize, $x, $y, $string, $color);
}
imagejpeg($image);
You can finetune calculations for your needs.

Answer 2

I'm using Imagick extension for same. If you want to go with this then follow detail:
PHP:
// Create objects
$image = new Imagick('image.png');
$watermark = new Imagick();
// Watermark text
$text = 'Copyright';
// Create a new drawing palette
$draw = new ImagickDraw();
$watermark->newImage(140, 80, new ImagickPixel('none'));
// Set font properties
$draw->setFont('Arial');
$draw->setFillColor('grey');
$draw->setFillOpacity(.5);
// Position text at the top left of the watermark
$draw->setGravity(Imagick::GRAVITY_NORTHWEST);
// Draw text on the watermark
$watermark->annotateImage($draw, 10, 10, 0, $text);
// Position text at the bottom right of the watermark
$draw->setGravity(Imagick::GRAVITY_SOUTHEAST);
// Draw text on the watermark
$watermark->annotateImage($draw, 5, 15, 0, $text);
// Repeatedly overlay watermark on image
for ($w = 0; $w < $image->getImageWidth(); $w += 140) {
for ($h = 0; $h < $image->getImageHeight(); $h += 80) {
$image->compositeImage($watermark, Imagick::COMPOSITE_OVER, $w, $h);
}
}
// Set output image format
$image->setImageFormat('png');
// Output the new image
header('Content-type: image/png');
echo $image;
although there are plenty of command-line examples to be found on the ImageMagick website, so that is where we shall begin.