<?php
 
// your code goes here
 
 
 
$addr1 = "5285 KEYES DR  KALAMAZOO MI 49004 2613";
$addr2 = "PO BOX 35  COLFAX LA 71417 35";
$addr3 = "64938 MAGNOLIA LN APT B PINEVILLE LA 71360-9781";
 
function extract_zipcode($address, $remove_statecode = false) {
    $zipcode = preg_match("/\b[A-Z]{2}\s+\d{5}(-\d{4})?\b/", $address, $matches);
    return $remove_statecode ? preg_replace("/[^\d\-]/", "", extract_zipcode($matches[0])) : $matches[0];
}
 
    echo extract_zipcode($addr1, 1) . ' ';
    echo extract_zipcode($addr2) . ' ';
 

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