Convert an array of arrays into a string?

Here's a one-liner:

$subject = array(
    array('foo' => '11'),
    array('bar' => '22'),
    array('bar' => '33'),
);

echo implode(" ", array_map("implode", $subject ));

11 22 33

You have to use array_reduce method

Solution :

<?php

$a = array(
  array('foo' => '11'),
  array('bar' => '22'),
);

function glue($carry, $item){
    $carry .= array_values($item)[0]." ";
    return $carry;
};

var_dump(trim(array_reduce($a, "glue", "")));
?>

Live example

Very simple, you have a multi dimensional array. Your top-level array has two elements (which are also arrays) with the index of '0' and '1' respectively.

Your child array is an associative array so instead of having an index of 0, 1, 2 ...n you have an index of 'foo' and 'bar' respectively.

So if you want to display the number 11...

$array = array(
  array('foo' => '11'),
  array('bar' => '22'),
);

echo $array[0]['foo'];

To make it into a sentence you would concatenate your two array elements

$array = array(
      array('foo' => '11'),
      array('bar' => '22'),
    );

    echo $array[0]['foo'] . ' ' . $array[1]['bar'];