<?php
  $identifiers = [
    ['contact', 1],
    ['company', 2],
    ['contact', 4],
    ['company', 3]
  ];

  foreach ($identifiers as list($type, $id)) {
    echo ucfirst($type) . ' - ' . $id . "\n";
  }
?>

Outputs:

Contact - 1
Company - 2
Contact - 4
Company - 3