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Print the contents of a multidimensional array php

I am trying to print the contents of a multidimensional array using a while loop. only the word "array" is displayed 4 times on the browser

<?php
$cars = array
  (
  array("Volvo"),
  array("BMW"),
  array("Saab"),
  array("Land Rover")
  );  
$i=0;
while ($i < count($cars)) {
   $a = $cars[$i];
   echo $a ."
";
   $i++;
}
?>
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by (71.8m points)
foreach($cars as $car){
    echo $car[0];
}

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