<?php

class TextFile {

protected $file;

public function __construct ($file) {
   $this->file = fopen ( $file, 'a+' );
   while ( !feof($this->file) ) {
   $line = fgets($this->file, 1024);
   $this->reviews[] = $line;
 }
}

public function save() {
    fwrite ($this->file, $this->newreview);
   }

}

class GuestBook extends TextFile {

protected $newreview;
protected $reviews = [];

public function getData() {
   return $this->reviews;
}

public function append($newreview) {
   $this->reviews[] = $newreview;
   $this->newreview = $newreview;
}

public function showbook() {
foreach ($this->reviews as $review) {
echo "\n" . $review;
}
}
}
?>