<?php
set_time_limit(300);

/*
  $BASE is YOUR Root Endpoint ~ http://blog.hatena.ne.jp/my/config/detail
*/
$BASE = 'https://blog.hatena.ne.jp/{user}/{Hatena::Blog ID  xxx.hatenablog.com}/atom/entry';

/*
  $USER_NAME is YOUR HATENA ID
*/
$USER_NAME = '??????';

/*
  $PASSWORD is YOUR API key  ~ http://blog.hatena.ne.jp/my/config/detail
*/
$PASSWORD = 'randomapikey00';

/*
  OUT PUT FILE NAME (optionally file path)
*/
$FILENAME = '/var/www/html/hatena/entrylist.json';

$target = $BASE;
$result = array();

while (true):
sleep(1);
$xml_buf = get_atom_pub($target);
$xml_obj = simplexml_load_string($xml_buf);
$json = json_encode($xml_obj);
$xml_array = json_decode($json, TRUE);

foreach ($xml_array['entry'] as $key){
  if( isset( $key['link']) ){
    $result[] = array(
      'title' => $key['title'],
      'permalink' => $key['link'][1]['@attributes']['href'],
    );
  } else {
    break;
  }
}

$ptn = $xml_array['link'][0]['@attributes']['href'] . '?page=';
$next_page_num = str_replace($ptn, '', $xml_array['link'][1]['@attributes']['href']);
// echo $next_page_num . " ";

if($next_page_num > 0){
  $target = $xml_array['link'][1]['@attributes']['href'];
} else {
  break;
}
endwhile;

/*
   Write JSON File
*/

if( file_exists($FILENAME) && !is_writable($FILENAME) )
  die('Error: failed to write file');

$fp = fopen($FILENAME, "w");
fwrite($fp, json_encode($result));
fclose($fp);
echo 'done';
exit;

function get_atom_pub($target){
  global $USER_NAME, $PASSWORD;

//  $URL = 'https://blog.hatena.ne.jp/{user}/{Hatena::Blog ID}/atom/entry';

  $ch = curl_init();
  if (!$ch) {
    die("Cannot initialize cURL");
  }
  curl_setopt($ch, CURLOPT_URL, $target);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_USERPWD, $USER_NAME . ":" . $PASSWORD);
  curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  $response = curl_exec($ch);
  if( $response === FALSE ){
    die( curl_error($ch) );
  }
  curl_close($ch);
  return $response;
}

<?php
header("Content-type: text/html; charset=UTF-8");

// Case of this path, in the same directory there is a JSON file.
$json = @file_get_contents('./entrylist.json', true);
if($json === false){
  die ('error');
} else {
  $data = json_decode($json ,true);
  $value = array_rand_value($data);
  foreach($value as $key => $val){
    $title = $val['title'];
    $href  = $val['permalink'];
  }
  $out = '<p class="randEntry"><a href="' . $href . '">' . $title . '</a></p>';  
  print $out;
}

/*
/  lib from Qiita http://qiita.com/Kazuhiro15/items/01d5692950c5fd8dc2a3
/  http://qiita.com/Kazuhiro15/items/01d5692950c5fd8dc2a3#comment-b4c14342ee0cb2908fbf
*/

function array_rand_value($array, $num = 1){
  if ($num < 1) {
    return;
  }
  if ($num >= count($array)) {
    return $array;
  }
  return array_intersect_key($array, array_flip((array)array_rand($array, $num)));
}