Arrays en PHP

<?php
 $miArray = [3, 4, "pepe", 5, false];
 $otro = array(3, 4, 5);
 var_dump($miArray);
 var_dump($otro);

$miArray[] = "otro elemento";
 $miArray[] = "y otro más";

var_dump($miArray);

$asociativo = ["a" => 5, "b" => 6, "c" => 12];
 foreach ($asociativo as $clave => $valor) {
 echo $clave . " - " . $valor . "<br/>";
 }
 $multi = [
 [1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]
 ];
 echo $multi[1][1]."<br/>";
 for ($i = 0; $i < count($multi); $i++) {
 for ($j = 0; $j < count($multi[$i]); $j++) {
 echo $i . " - " . $j . " : " . $multi[$i][$j] . "<br/>";
 }
 }
 foreach ($multi as $f=>$filas){
 foreach($filas as $c=>$valor){
 echo $f." - ".$c." : ".$valor."<br/>";
 }
 }
 
 print_r($multi);
 ?>