Filter array or string(removing some words)
<p>My problem is not very complex but I can't find a solution yet. I have a string:</p>

<pre><code>$temp_string = '20938999038,0.5,83888999289,0.5,98883888778,0.9';

// Meaning syskey, price, syskey, price, syskey, price
</code></pre>

<p>I want to remove price and show only syskey.</p>

<p>My desirable result: </p>

<pre><code> '20938999038,83888999289,98883888778'
</code></pre>

<p>Thanks in advance.</p>
