<?php

  for ( $i = 0; $i < 10; $i++ ) {
    echo $i . ' ' . (( $i % 2 === 0 ) ? "even" : "odd" );
    echo PHP_EOL;
  }

0 even
1 odd
2 even
3 odd
4 even
5 odd
6 even
7 odd
8 even
9 odd