Pretend PHP in Eleventy with Nunjucks

gistfile1.txt

// .eleventy.js
let Nunjucks = require("nunjucks");

module.exports = function(eleventyConfig) {
  let env = Nunjucks.configure(".", {
    tags: {
      blockStart: '<?php',
      blockEnd: '?>',
    }
  });

  eleventyConfig.setLibrary("njk", env);

  eleventyConfig.addShortcode("echo", function(str) {
    return str;
  })
};

// test.njk
hi

<?php if true ?>
hi again
<?php endif ?>

<?php echo "test" ?>