PHP : How to check value from multi arrays?
<p>I have an output arrays like this..</p>

<pre><code>array
'B5' =&gt; string 'user1' (length=5)
'B4' =&gt; string 'user1' (length=5)

array
'D3' =&gt; string 'user1' (length=5)
'D2' =&gt; string 'user1' (length=5)
'D1' =&gt; string 'user1' (length=5)

array
'A4' =&gt; string 'user1' (length=5)
'A2' =&gt; string 'user1' (length=5)

array
 'E3' =&gt; string 'user1' (length=5)
 'E2' =&gt; string 'user1' (length=5)
 'E1' =&gt; string 'user1' (length=5)
</code></pre>

<p>I would like to check if a particular item such as 'E1' exists in these arrays.
How should I go about this?</p>
