Check if an array is in the key of another array in PHP
<p>I've an array like <code>$ignore_post = array("foo", "bar");</code> and I need to check if <code>foo</code> or <code>bar</code> is a key for <code>$_POST</code> (if <code>$_POST["foo"]</code> or <code>$_POST["bar"]</code> exists).</p>

<p>How I can do that?</p>

<p>Thank you in advance</p>
