<?php

$arr = Array(0 => 22017, 1 => 160270, 2 => 2, 3 => 62017, 4 => 135026, 5 
=> 82017, 6 => 150154);

$arr_filtrado = array_filter($arr, function($elemento){
    return $elemento > 999;
});

print_r($arr_filtrado);