php 8.1

[cfconsultancy]

In php 8.1 change

line 387
$x = (($x - (1 / 3) + 1.0) % 2.0 * 0.5 - 0.5) * 16;

to
$x = ((int)($x - (1 / 3) + 1.0) % 2.0 * 0.5 - 0.5) * 16;

[nickdekh]

or maybe change to
$x = (fmod($x - (1 / 3) + 1.0, 2.0) * 0.5 - 0.5) * 16;