gistfile1.php

<?php
$array[0] = array(1600,1601,1602,1603);
$array[1] = array(1601,1602,1603,1604);
$array[2] = array(1602,1603,1604,1605);

$num_filter = make_filter( "/^160[23]$/" );

$hits = array_map( $num_filter, $array );

exit;

function make_filter ( $pattern ) {
    $code = 'return preg_grep( "'.$pattern.'", $array );';
    $filter_func = create_function( '$array', $code );
    return $filter_func;
}

?>