<?php
$tab = Array(
Array('A','C','C','D','D','D','D','E','E','Q','R','R','W'));
for($z=0; $z<count($tab); $z++){
for($x=0; $x<count($tab[$z])-1; $x++){
if($tab[$z][$x]== $tab[$z][$x+1]){
unset($tab[$z][$x]);
$tab[$z] = array_values($tab[$z]);
$x--;
}
}
}
print_r($tab);
?>