YouTube Data API v3 con PHP

La YouTube Data API v3 ha dejado de estar en fase beta por lo que he realizado algunas pruebas en PHP para cuando vaya a implementar esta versión en mi plugin Youtube Channel Gallery. Mi intención es hacer otra prueba con JavaScript, más adelante, para valorar cuál es la opción más interesante para integrar en mi plugin.

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La principales características de esta prueba con la YouTube Data API v3 son:

Mostrar vídeos de una playlist, subidos por un usuario, favoritos, marcados como me gusta y el resultado de una búsqueda.
En lugar de usar OAuth, he usado la API key directamente ya que no he planteado hacer accesos que requieran autorización.
He implementado paginación usando los atributos prevPageToken nextPageToken.
Control de los vídeos privados para que funcione con resultados en los que aparezcan vídeos privados. Se mostrará la miniatura del vídeo con un icono superpuesto que advierte de que es un vídeo privado.

El código del PHP de la demo es el siguiente:

<?php
	// url
	$url = 'https://www.googleapis.com/youtube/v3/';
	//key
	$key = 'key=' . 'my_api_key';

	//defaults
	$_POST['resource'] = isset( $_POST['resource'] ) ? $_POST['resource'] : 'playlistItems';
	$_POST['resource_param'] = isset( $_POST['resource_param'] ) ? $_POST['resource_param'] : 'PLD428BE966FF3B1E9';
	$_POST['maxResults'] = isset( $_POST['maxResults'] ) ? $_POST['maxResults'] : '8';
	$_POST['pageToken'] = isset( $_POST['pageToken'] ) ? $_POST['pageToken'] : '';
	$_POST['page'] = isset( $_POST['page'] ) ? $_POST['page'] : '0';
	$_POST['title'] = isset( $_POST['title'] ) ? $_POST['title'] : '';
	$_POST['description'] = isset( $_POST['description'] ) ? $_POST['description'] : '';

	$channels_type = array( 'likes', 'favorites', 'uploads' );

	//resource
	if ( in_array( $_POST['resource'], $channels_type ) || $_POST['resource'] == 'playlistItems' ) {
		$resource = 'playlistItems?';
	} else {
		$resource = 'search?';
	}

	//Required parameters
	$part = 'part=snippet&';

	//Main resource parameter: playlistId / q
	//-------------------------------
	//playlists ID
	if ( $_POST['resource'] == 'playlistItems' ) {
		// Playlist ID
		$resource_param = 'playlistId=' . $_POST['resource_param'] . '&';
	}
	//user likes, favorites or uploads ID
	if ( in_array( $_POST['resource'], $channels_type ) ) {
		$user_resource = 'channels?';
		$user_part = 'part=contentDetails&';
		$user_name = 'forUsername=' . $_POST['resource_param'] . '&';
		$user_fields = 'fields=items(contentDetails)&';
		$user_str_datos = file_get_contents( $url . $user_resource . $user_part . $user_name . $user_fields . $key );
		$user_datos = json_decode( $user_str_datos, true );
		$resource_param = 'playlistId=' . $user_datos["items"][0]["contentDetails"]["relatedPlaylists"][$_POST['resource']] . '&';
	}
	//search query
	if ( $_POST['resource'] == 'search' ) {
		$resource_param = 'q=' . urlencode( $_POST['resource_param'] ) . '&type=video&';
	}

	//Optional parameters
	$maxResults = 'maxResults=' .  $_POST['maxResults'] . '&';

	if ( empty( $_POST['pageToken'] ) ) {
		$pageToken = '';
	} else {
		$pageToken = 'pageToken=' .  $_POST['pageToken'] . '&';
	}

	$fields = 'fields=items(snippet),nextPageToken,prevPageToken,pageInfo';

	$request = $url . $resource . $part . $resource_param . $maxResults . $pageToken . $key ;
	$str_datos = file_get_contents( $request );
	$datos = json_decode( $str_datos, true );

	//Video gallery
	//-------------------------------
	$youtube_videos = '';

	//gallery title
	if ( $_POST['resource'] == 'search' ) {
		$gallery_title = $_POST['resource_param'];
	}else {
		$gallery_title = $datos["items"][0]["snippet"]["channelTitle"];
	}

	$youtube_videos .= '<h2>' . $gallery_title . '</h2>';

	//gallery
	$youtube_videos .= '<ul>';
	foreach ( $datos["items"] as $items ) {
		$youtube_videos .= '<li>';

		//video id
		if ( $_POST['resource'] == 'search' ) {
			$videoId = $items["id"]["videoId"];
		} else {
			$videoId = $items["snippet"]["resourceId"]["videoId"];
		}

		//check private thumbnail videos
		if ( !isset( $items["snippet"]["thumbnails"] ) && $items["snippet"]["title"] == 'Private video' ) {
			//get private thumbnail videos
			$thumbnail_url = 'https://i1.ytimg.com/vi/' . $items["snippet"]["resourceId"]["videoId"] . '/default.jpg';
			$video_state = 'private';
		} else {
			$thumbnail_url = $items["snippet"]["thumbnails"]["default"]["url"];
			$video_state = 'public';
		}

		//thumbnail
		$youtube_videos .= '<div class="' . $video_state . '"><a href="https://www.youtube.com/watch?v=' . $videoId . '"><img src="' . $thumbnail_url . '"></a></div>';

		//title
		if ( !empty( $_POST['title'] ) ) {
			$youtube_videos .= '<h3><a href="https://www.youtube.com/watch?v=' . $videoId . '">' . $items["snippet"]["title"] . '</a></h3>';
		}
		//description
		if ( !empty( $_POST['description'] ) ) {
			$youtube_videos .= '<p>' . $items["snippet"]["description"] . '</p>';
		}
		$youtube_videos .= '</li>';
	}
	$youtube_videos .= '</ul>';

	//Pagination
	//-------------------------------
	//previous page link
	$youtube_videos .= '<div class="pagination">';
	$youtube_videos .= '<div>';
	if ( isset( $datos["prevPageToken"] ) ) {
		$youtube_videos .= '<a data-prev="' .$datos["prevPageToken"]. '" class="prev-button">Previous</a>';
	}
	$youtube_videos .= '</div>';

	//current and total pages
	$youtube_videos .= '<div>';
	$current_page = $_POST['page'];
	$total_pages = ceil( $datos["pageInfo"]["totalResults"] / $datos["pageInfo"]["resultsPerPage"] );
	$youtube_videos .= $current_page . '/' . $total_pages;
	$youtube_videos .= '</div>';

	//next page link
	$youtube_videos .= '<div>';
	if ( isset( $datos["nextPageToken"] ) ) {
		$youtube_videos .= '<a data-next="' .$datos["nextPageToken"]. '" class="next-button">Next</a>';
	}
	$youtube_videos .= '</div>';
	$youtube_videos .= '</div>';

	echo $youtube_videos;
?>

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<?php

// url

$url = 'https://www.googleapis.com/youtube/v3/';

//key

$key = 'key=' . 'my_api_key';

//defaults

$_POST['resource'] = isset( $_POST['resource'] ) ? $_POST['resource'] : 'playlistItems';

$_POST['resource_param'] = isset( $_POST['resource_param'] ) ? $_POST['resource_param'] : 'PLD428BE966FF3B1E9';

$_POST['maxResults'] = isset( $_POST['maxResults'] ) ? $_POST['maxResults'] : '8';

$_POST['pageToken'] = isset( $_POST['pageToken'] ) ? $_POST['pageToken'] : '';

$_POST['page'] = isset( $_POST['page'] ) ? $_POST['page'] : '0';

$_POST['title'] = isset( $_POST['title'] ) ? $_POST['title'] : '';

$_POST['description'] = isset( $_POST['description'] ) ? $_POST['description'] : '';

$channels_type = array( 'likes', 'favorites', 'uploads' );

//resource

if ( in_array( $_POST['resource'], $channels_type ) || $_POST['resource'] == 'playlistItems' ) {

$resource = 'playlistItems?';

} else {

$resource = 'search?';

}

//Required parameters

$part = 'part=snippet&';

//Main resource parameter: playlistId / q

//-------------------------------

//playlists ID

if ( $_POST['resource'] == 'playlistItems' ) {

// Playlist ID

$resource_param = 'playlistId=' . $_POST['resource_param'] . '&';

}

//user likes, favorites or uploads ID

if ( in_array( $_POST['resource'], $channels_type ) ) {

$user_resource = 'channels?';

$user_part = 'part=contentDetails&';

$user_name = 'forUsername=' . $_POST['resource_param'] . '&';

$user_fields = 'fields=items(contentDetails)&';

$user_str_datos = file_get_contents( $url . $user_resource . $user_part . $user_name . $user_fields . $key );

$user_datos = json_decode( $user_str_datos, true );

$resource_param = 'playlistId=' . $user_datos["items"][0]["contentDetails"]["relatedPlaylists"][$_POST['resource']] . '&';

}

//search query

if ( $_POST['resource'] == 'search' ) {

$resource_param = 'q=' . urlencode( $_POST['resource_param'] ) . '&type=video&';

}

//Optional parameters

$maxResults = 'maxResults=' . $_POST['maxResults'] . '&';

if ( empty( $_POST['pageToken'] ) ) {

$pageToken = '';

} else {

$pageToken = 'pageToken=' . $_POST['pageToken'] . '&';

}

$fields = 'fields=items(snippet),nextPageToken,prevPageToken,pageInfo';

$request = $url . $resource . $part . $resource_param . $maxResults . $pageToken . $key ;

$str_datos = file_get_contents( $request );

$datos = json_decode( $str_datos, true );

//Video gallery

//-------------------------------

$youtube_videos = '';

//gallery title

if ( $_POST['resource'] == 'search' ) {

$gallery_title = $_POST['resource_param'];

}else {

$gallery_title = $datos["items"][0]["snippet"]["channelTitle"];

}

$youtube_videos .= '<h2>' . $gallery_title . '</h2>';

//gallery

$youtube_videos .= '<ul>';

foreach ( $datos["items"] as $items ) {

$youtube_videos .= '<li>';

//video id

if ( $_POST['resource'] == 'search' ) {

$videoId = $items["id"]["videoId"];

} else {

$videoId = $items["snippet"]["resourceId"]["videoId"];

}

//check private thumbnail videos

if ( !isset( $items["snippet"]["thumbnails"] ) && $items["snippet"]["title"] == 'Private video' ) {

//get private thumbnail videos

$thumbnail_url = 'https://i1.ytimg.com/vi/' . $items["snippet"]["resourceId"]["videoId"] . '/default.jpg';

$video_state = 'private';

} else {

$thumbnail_url = $items["snippet"]["thumbnails"]["default"]["url"];

$video_state = 'public';

}

//thumbnail

$youtube_videos .= '<div class="' . $video_state . '"><a href="https://www.youtube.com/watch?v=' . $videoId . '"><img src="' . $thumbnail_url . '"></a></div>';

//title

if ( !empty( $_POST['title'] ) ) {

$youtube_videos .= '<h3><a href="https://www.youtube.com/watch?v=' . $videoId . '">' . $items["snippet"]["title"] . '</a></h3>';

}

//description

if ( !empty( $_POST['description'] ) ) {

$youtube_videos .= '<p>' . $items["snippet"]["description"] . '</p>';

}

$youtube_videos .= '</li>';

}

$youtube_videos .= '</ul>';

//Pagination

//-------------------------------

//previous page link

$youtube_videos .= '<div class="pagination">';

$youtube_videos .= '<div>';

if ( isset( $datos["prevPageToken"] ) ) {

$youtube_videos .= '<a data-prev="' .$datos["prevPageToken"]. '" class="prev-button">Previous</a>';

}

$youtube_videos .= '</div>';

//current and total pages

$youtube_videos .= '<div>';

$current_page = $_POST['page'];

$total_pages = ceil( $datos["pageInfo"]["totalResults"] / $datos["pageInfo"]["resultsPerPage"] );

$youtube_videos .= $current_page . '/' . $total_pages;

$youtube_videos .= '</div>';

//next page link

$youtube_videos .= '<div>';

if ( isset( $datos["nextPageToken"] ) ) {

$youtube_videos .= '<a data-next="' .$datos["nextPageToken"]. '" class="next-button">Next</a>';

}

$youtube_videos .= '</div>';

echo $youtube_videos;

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