new line in php not working code example

Example 1: new line php

<?php
echo "If you view the page source \r\n you will find a newline in this string.";
echo "<br>";
echo nl2br("You will find the \n newlines in this string \r\n on the browser window.");
?>
  // 2 Way
  <?php echo $clientid, ' ', $lastname, PHP_EOL;?>

Example 2: newline not working php

// When you run a PHP script in a browser, it will be rendered as HTML by default.
// Use <br /> instead or modify the header to content type plain text
echo "Hello <br /> World";