将常量(非变量)插值到"heredoc"中

分类: 技术问答 • 2022-05-04 17:56:13

问题描述：

考虑:

<?php
   define('my_const', 100);
   echo <<<MYECHO
      <p>The value of my_const is {my_const}.</p>
MYECHO;
?>

如果我在大括号内放一个变量，它将打印出来.但不是常数.我该怎么办?

If I put a variable inside the braces, it prints out. But not the constant. How can I do it?

答

define('my_const', 100);
$string = <<< heredoc
      <p>The value of my_const is %s.</p>
heredoc;

$string = sprintf($string, my_const);