PHP Array Readable : <p>I have an Array format.</p>

<pre><code>Array
(
    [0] =&gt; Array
        (
            [order_id] =&gt; 1
        )

    [1] =&gt; Array
        (
            [order_id] =&gt; 11
        )

    [2] =&gt; Array
        (
            [order_id] =&gt; 12
        )

)
</code></pre>

<p>It should to be changed the array format to be like this format:</p>

<pre><code>[1,11,12];
</code></pre>

<p>Please help. Thank you in advanced.</p>
