Untitled

Vaildate a Zip code against a list
var badZips = {
  "19020": true,
  "19021": true
  ...
};


var goodZips = {
  "90210": true,
  ...
};

if(badZips[zip]) {
  alert("You entered a bad zip code");
}

else if(goodZips[zip]) {
  alert("You entered a good zip code");
}

else {
  alert("That zip code is not recognized");
}

<?php
   $areaCodes = array( array('aCode'='19020','aFlag'=>true),
                       array('aCode'='19021','aFlag'=>true),
                       array('aCode'='19022','aFlag'=>false)
                     );
?>

<?php
 $BadZip = array("19020", "19021");

 if (in_array($Zip, $BadZip))
 {
   echo "Bad Zip code!";
 }
?>