<?php
$search = '358545454554';
$countries = [[1, 'USA'], [93, 'Afghanistan'], [358, 'Finland']];
$country = null;
foreach ($countries as $c) {
  if (substr($search, 0, strlen($c[0])) == $c[0]) {
    $country = $c[1];
    break;
  }
}
echo ($country === null) ? 'No country found!' : $country;