PHP: Condition for field key value

How do I declare a condition for a field key value. I have a custom field and part of this statement is used to开发者_如何学编程 display its value...

function SINGLE_CUSTOMFIELDS($post,$FieldValues){

    global $wpdb,$PPT;$row=1;

    if($FieldValues ==""){ 
        $FieldValues = get_option("customfielddata");
    }

    if(is_array($FieldValues)){

        print "<div class='offer-info'>";

        foreach($FieldValues as $key => $field){

            if(isset($field['show']) && $field['enable'] == 1 ){                 

            $imgArray = array('jpg','gif','png', 'swf');

            $value = $PPT->GetListingCustom($post->ID,$field['key'] );

            if(is_array($value) || strlen($value) < 1){   }else{

                if($field['key'] == "Zipcode"){

                print "<div style='display:none'><p><br />"; 
                print "<b>".$field['name']."</b></p><p><br />";

                }

I want to set a condition for the field key Zipcode that is equal to a value (Ex. 33138)

I was thinking that it would be something like this:

if($field['key'] == "Zipcode" => "33138"){

                print "Print something"; 

                }

But apparently this is wrong. I would appreciate if someone showed how to set a condition for a specific field key value. And also for multiple field keys in the condition statement.

Thanks a lot.

---

I'm not entirely sure this is what you mean by "field key", but how about accessing it by name?

if ($field["Zipcode"] == "33138") {
    print "Print something";
}