测试代码

<?php
  // Declare the variable 'string' and assign it a value.
  // The <br> is the HTML equivalent to a new line.
  $string = 'Hello World!<br>';

  // You can echo the variable, similar to the way you would echo a string.
  echo $string;

  // You could also use print.
  print $string;

  // Or, if you are familiar with C, printf can be used too.
  printf('%s', $string);
?>