How to loop an array within another array?

[SubhanUllah]

$arrays_array = array(array("foo", "bar"), array("baz", "quux")); 
$parent_array_len = count($arrays_array); 
 
for($i = 0; $i < $parent_array_len; $i++){ 
  $nested_array = $arrays_array[$i]; 
  $nested_array_len = count($nested_array); 
 
  for($j = 0; $j < $nested_array_len; $j++){ 
 
    /* 
     * Outputs: 
     * foo 
     * bar 
     * baz 
     * quux 
     */ 
    echo $nested_array[$j].PHP_EOL; 
  } 
}