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php-gdHow to control objects overlapping order (z-index)


There's nothing like z-index in gd, but you can control what's being on top. Objects that are drawn later will be on top of previously drawn. Red ellipse will be on top of green one since it was drawn later:

<?php

$im = imagecreatetruecolor(400, 300);

$c_black = imageColorAllocate($im, 0,0,0);
$c_green = imageColorAllocate($im, 46,204,64);
$c_red = imageColorAllocate($im, 255, 64, 64);

imagefilledellipse($im, 200, 150, 100, 100, $c_green);
imagefilledellipse($im, 250, 200, 100, 100, $c_red);

imagePng($im, '/tmp/image.png');ctrl + c
imagecreatetruecolor

creates true color GD image object with specified width & height

imageColorAllocate

creates color object to later use in image

imagefilledellipse

creates ellipse with specified coordinates, radius and color

imagePng

saves image in PNG format to the given path


How to control objects overlapping order (z-index), php gd

Usage example

<?php

$im = imagecreatetruecolor(400, 300);

$c_black = imageColorAllocate($im, 0,0,0);
$c_green = imageColorAllocate($im, 46,204,64);
$c_red = imageColorAllocate($im, 255, 64, 64);

imagefilledellipse($im, 200, 150, 100, 100, $c_green);
imagefilledellipse($im, 250, 200, 100, 100, $c_red);

imagePng($im, '/tmp/image.png');