gistfile1.php

<?php

$blueprint = json_decode( '{
  "sample": {
    "themes": [
      "automattic/_s"
    ],
    "mu_plugins": {
      "wds-required-plugins": "https://github.com/WebDevStudios/WDS-Required-Plugins.git"
    },
    "plugins": {
      "clef": "https://github.com/clef/wordpress/archive/master.zip",
      "cmb2": "CMB2"
    },
    "options": {
      "active_theme": "_s"
    },
    "defines": {
      "WP_CACHE": false
    }
  }
}', true );
 
/**
 * Loop through blueprint
 */
foreach ( $blueprint as $key => $value ) {
  // Continue looping through $value if it's another map, or just use $value
  foreach ( $map as $k => $v ) {
    // etc.
  }
}