PocketMine-MP: print all characters/symbols inside a font image file (glyph_XX.png)

pmmp_glyph_send.php

<?php
const GRID = 16;//16 * 16 icons
$filename = basename("glyph_E1",".png");
$startChar = hexdec(substr($filename, strrpos($filename, "_")+1)."00");
$i=0;
do{
  $x = $i % GRID;
  $z = ($i - ($i % GRID)) / GRID;
  $ci = $startChar + $i;//char index
  $char = mb_chr($ci);
  $hex = dechex($ci);
  print "I:$i X:$x Z:$z H:$hex C#:$ci C:$char".PHP_EOL;
}
while(++$i < GRID**2);