PHP : how to get element from array with key like
<p>If i have array like that</p>

<pre><code>array [
       y =&gt; 35
       x =&gt; 51
       z =&gt; 35
       c_3 =&gt; 4
       c_1 =&gt; 54
       c_6 =&gt; 53
       c_9 =&gt; 52
] 
</code></pre>

<p>i want to get array of </p>

<pre><code>array [c_3=&gt;4, c_1=&gt;54, c_6=&gt;53, c_9=&gt;52]
</code></pre>

<p>without unrest the unwanted fields </p>
