WebPage.php (PHP Script)

<?PHP

/* Created by Sirius / James Walston, All rights are reserved.
Failure to comply to the NOTICE of this and/or claim of own
written code is by of losing all legitimacy of the script itself. */

include "errors.php";

interface webclass {
  public function __construct($html_file);
  public function append_header($tag, $value);
  public function delete_header($tag);
  public function commit();
}

final class WebPage implements webclass {
  public $page;
  public $page_headers;

  // Initializes construction of the class
  public function __construct($html_file) {
    if(file_exists($_SERVER["DOCUMENT_ROOT"] . "/templates/{$html_file}")) {
      $this->page = file_get_contents($_SERVER["DOCUMENT_ROOT"] . "/templates/{$html_file}");
      $this->page_headers = [];
    }

    else die("The file {$html_file} does not exist.");
  }

  // Creates for allowable appending to headers list
  public function append_header($tag, $value) {
    if(!empty($this->page_headers[$tag])) {
      die("This tag already exists.");
    }

    else $this->page_headers[$tag] = $value;
  }

  // Deletes a tag in the headers list
  public function delete_header($tag) {
    if(!in_array($tag, $this->page_headers)) {
      die("This tag does not exist.");
    }

    else unset($this->page_headers[$tag]);
  }

  // Begins re-modifying the headers/tags for the page
  public function commit() {
    if(!empty($this->page_headers)) {
      foreach($this->page_headers as $header_tag => $value) {
        # Works as: str_replace(find text, change to this text, inside var);
        $this->page = str_replace(
          $header_tag,
          $value,
          $this->page
        );
      }
    }
  }
}

?>