<?php /* If you get an error related to the date and time, please specify the default term zone like ↓ date_default_timezone_set("America/Los_Angeles"); */  //YouTube API v3 $API_KEY = "***************************************";  // Get the channel ID from the user name (skip OK if you know the ID) function get_user_channel_id($user){     global $API_KEY;     $url = 'https://www.googleapis.com/youtube/v3/channels?key=' . $API_KEY . '&part=id&forUsername=';     return search($user,$url)['items'][0]['id']; }  //  function search($searchTerm,$url){     $url = $url . urlencode($searchTerm);      $result = file_get_contents($url);      if($result !== false){         return json_decode($result, true);     }      return false; }  function push_data($searchResults){     global $data;     foreach($searchResults['items'] as $item){         $data[] = $item;     }     return $data; }  function get_url_for_time_period($channelId, $time){     global $API_KEY;     // Date and time type specification     $publishedAfter = date("Y-m-dTH:i:sP",strval($time));     //　Specify the period of 60 days     $publishedBefore_ = $time + (60 * 60 * 24 * 60);     $publishedBefore = date("Y-m-dTH:i:sP",$publishedBefore_);     // Make request URL     $url = 'https://www.googleapis.com/youtube/v3/search?part=snippet&type=video&key=' . $API_KEY . '&maxResults=50&channelId=' . $channelId . '&publishedAfter=' . urlencode($publishedAfter) . '&publishedBefore=' . urlencode($publishedBefore);      return array("url"=>$url,"utc"=>$publishedBefore_); }   $start_date = "YYYY-MM-DD"; // Set date $time = strtotime($start_date); $username = "*****"; // ex. hikakintv  $channelId = get_user_channel_id($username);  while($time < time()){     $url = get_url_for_time_period($channelId, $time);     $searchResults = search("", $url['url']);     $data = push_data($searchResults);     $time += 60 * 60 * 24 * 60; // Add 60 days }  // If you want to display the returned data echo "<pre>"; var_dump($data); echo "</pre>";  // If you want to save the array in JSON format $json = json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES); file_put_contents($username . ".json" , $json);  // If you want to output the number of videos print count($data); 

[     {         "kind": "youtube#searchResult",         "etag": "cRtdkU1jXJ6Abga3q5S490FrsP0",         "id": {             "kind": "youtube#video",             "videoId": "0t8CH5BAgLY"         },         "snippet": {             "publishedAt": "2011-07-20T15:19:55Z",             "channelId": "UCZf__ehlCEBPop-_sldpBUQ",             "title": "世界一おいしい飲み物『ピルクル』 - The World Best Juice『Pirukuru』 -",             "description": "ピルクルに勝る飲み物なし。",             "thumbnails": {                 "default": {                     "url": "https://i.ytimg.com/vi/0t8CH5BAgLY/default.jpg",                     "width": 120,                     "height": 90                 },                 "medium": {                     "url": "https://i.ytimg.com/vi/0t8CH5BAgLY/mqdefault.jpg",                     "width": 320,                     "height": 180                 },                 "high": {                     "url": "https://i.ytimg.com/vi/0t8CH5BAgLY/hqdefault.jpg",                     "width": 480,                     "height": 360                 }             },             "channelTitle": "HikakinTV",             "liveBroadcastContent": "none",             "publishTime": "2011-07-20T15:19:55Z"         }     },