Arrays multidimensionales en PHP

$b=array(array('A','b'),array('c','d','e','f'),array('g','h','i'));
echo "<pre>";
print_r($b);

echo "</pre>";

echo $b[1][2];
echo "<br/>";
for ($i=0;$i<count($b);$i++){
 for($j=0;$j<count($b[$i]);$j++){
 echo "($i,$j) ".$b[$i][$j]." | ";
 }
 echo "<br/>";
}

foreach($b as $valor){
 foreach($valor as $letra){
 echo $letra."|";
 }
 echo "<br/>";
}


for ($i = 0; $i < 5; $i++)
 for ($j = 0; $j < 5; $j++)
 $c[$i][$j] = $j + $i * 5;

 echo array_to_table($c);
 
function array_to_table($tabla) {
 $res="<table border=1>";
 for ($i = 0; $i < count($tabla); $i++) {
 $res.="<tr>";
 for ($j = 0; $j < count($tabla[$i]); $j++) {
 $res.="<td>" . $tabla[$i][$j] . "</td>";
 }
 $res.="</tr>";
 }
 $res.="</table>";
 return $res;
}

//Mezcla sin sentido, a lo loco:

$tutifruti=array('juan'=>array('a','b','c'),'ana'=>array('c'=>3,'d'=>6,'e'=>8),'rosa'=>array('j','k',array(1,2,3,4)));

var_dump($tutifruti);