<?php
$word = "Koordinatensystem";
$psdoc = ps_new();
ps_set_parameter($psdoc, "hyphendict", "hyph_de.dic");
$hyphens = ps_hyphenate($psdoc, $word);
for($i=0; $i<strlen($word); $i++) {
echo $word[$i];
if(in_array($i, $hyphens))
echo "-";
}
ps_delete($psdoc);
?>
The above example will output: