我有一个Instagram小部件，它使用Instagram刮刀，根据自定义程序输入的用户名，在瞬间缓存数据以显示照片。
不幸的是，当我更新用户名时，瞬态不会更新。它使用旧的（来自旧用户名），这实际上不允许我使用新用户名渲染照片，这使得小部件在第一次使用后有些无用。
简言之，我正在寻找类似的东西：
if( is_updated($username) ? new_transient($username) : get_transient($username).
scrapper[skip to next block for the transient bit]:
<?php
namespace Social_Space;
/**
* Interface to scrape most popular JSON-enabled social networks.
*/
interface Scrape_Interface {
/* Builds the end-point, or the link that will be queried */
public function build_endpoint();
/* Ingests the pure, non-altered JSON data */
public function get_json();
/* Handles and cleans the data */
public function get_data();
}
class Scrape_Instagram implements Scrape_Interface {
private $username;
public function set_username( $username ) {
$this->username = $username;
}
/**
* Builds the endpoint for the Instagram API, provided the username from constructor.
* @param $end_cursor Used in case the user wants more pictures to be scrapped.
*/
public function build_endpoint() {
return \'https://www.instagram.com/\' . trim( strtolower( $this->username ) ) . \'/?__a=1\';
}
/**
* GETs the data from Instagram, provided the endpoint.
*/
public function get_json() {
if ( false === ( $data = get_transient( \'instagram_data\' ) ) ) {
$request = wp_remote_get( $this->build_endpoint() );
if( is_wp_error( $request ) ) {
return new WP_Error( \'site-down\', esc_html__( \'Instagram may be down. Unable to communicate.\', \'_s\') );
}
elseif( wp_remote_retrieve_response_code( $request ) !== 200 ) {
return new WP_Error( \'invalid-response\', esc_html__( \'Got an invalid response.\', \'_s\') );
}
else {
set_transient( \'instagram_data\', wp_remote_retrieve_body( $request ), 5 );
}
}
return $data;
}
/**
* Ingests the data from get_json() then converts / decodes into an array.
*/
public function get_data() {
$json = $this->get_json();
if( is_wp_error( $json ) ) {
return new WP_Error( \'invalid-json\', esc_html__( \'Something is wrong. Did you enter the right username?\', \'_s\' ) );
}
$data = json_decode( $json, true);
if( is_wp_error( $data ) ) {
return new WP_Error( \'invalid-data\', esc_html__( \'Something is wrong. Did you enter the right username?\', \'_s\' ) );
} else {
return $data;
}
}
}
class Generate_Instagram_Links {
private $instagram_object;
private $username;
public function __construct( $username, Scrape_Instagram $instagram_object = null ) {
$this->username = $username;
$this->instagram_object = $instagram_object === null ? new Scrape_Instagram : $instagram_object;
$this->instagram_object->set_username( $this->username );
}
/**
* Generates the link to the source image, as well as to the instagram post of each image
* requested by our script.
*/
public function get_links() {
$response = $this->instagram_object->get_data();
/**
* Based on the array generated from get_data(), some nodes have resulted that contain * information about
* each photo the user has, as such, we\'ll loop through each photo and access any data.
* @see [\'user\'][\'media\'][\'nodes\'] - individual node / image.
*/
if( is_wp_error( $response ) ) {
return new WP_Error( \'invalid-json\', esc_html__( \'Ouch. The data was not parsed correctly. Cannot continue.\' ) );
} else {
foreach( $response[\'user\'][\'media\'][\'nodes\'] as $node ) {
$image = array(\'real_link\' => \'src\' );
$image[\'real_link\'] = \'https://www.instagram.com/p/\' . $node[\'code\'] . \'?taken-by=\' . $this->username;
$image[\'src\'] = $node[\'thumbnail_resources\'][0][\'src\'];
$images_links[] = $image;
}
}
return $images_links;
}
/**
* Getter for the instagram links (non-local).
*/
public function get_instagram_photos_links() {
$links = $this->get_links();
if( is_wp_error( $links) ) {
return new WP_error( \'unknown-error\', esc_html__( \'Something went wrong. Cannot get data. Check username or contact developer.\') );
} else {
return $links;
}
}
/**
* Gets the local photo links of the newly added instagram photo links, or retrieves the
* links if they already exist(to not flood the media library).
* @todo Add an "expiry" date for each image, or remove if no longer used.
*/
private function get_local_links() {
// Requires loading of the wp-admin scripts.
require_once (\'wp-load.php\');
require_once (\'wp-admin/includes/admin.php\');
$urls = $this->get_instagram_photos_links();
$local_images = array();
foreach( $urls as $url ) {
$tmp = download_url( $url[\'src\'] );
$file_array = array(
\'name\' => basename( $url[\'src\'] ),
\'tmp_name\' => $tmp
);
$wp_upload_dir = wp_get_upload_dir();
$local_url = $wp_upload_dir[\'path\'] . \'/\' . $file_array[\'name\'];
if( file_exists( $local_url ) ) {
array_push( $local_images, ($wp_upload_dir[\'url\'] . \'/\' . $file_array[\'name\']) );
} else {
if ( is_wp_error( $tmp ) ) {
@unlink( $file_array[ \'tmp_name\' ] );
return $tmp;
}
$GLOBALS[\'post\'] = null;
$post_id = \'0\';
$id = media_handle_sideload( $file_array, $post_id, $desc = null, $post_data = array(\'post_content\' => \'insta_image\' ) );
if ( is_wp_error( $id ) ) {
@unlink( $file_array[\'tmp_name\'] );
return $id;
}
$value = wp_get_attachment_url( $id );
array_push( $local_images, $value );
}
}
return $local_images;
}
/**
* Getter for the instagram links (local).
*/
public function get_instagram_local_photos_links() {
$links = $this->get_local_links();
if( is_wp_error( $links) ) {
return new WP_error( \'unknown-error\', esc_html__( \'I cannot get the local links of the pictures. Check with the developer.\' ) );
} else {
return $links;
}
}
}
namely the function "get_json":
public function get_json() {
if ( false === ( $data = get_transient( \'instagram_data\' ) ) ) {
$request = wp_remote_get( $this->build_endpoint() );
if( is_wp_error( $request ) ) {
return new WP_Error( \'site-down\', esc_html__( \'Instagram may be down. Unable to communicate.\', \'_s\') );
}
elseif( wp_remote_retrieve_response_code( $request ) !== 200 ) {
return new WP_Error( \'invalid-response\', esc_html__( \'Got an invalid response.\', \'_s\') );
}
else {
set_transient( \'instagram_data\', wp_remote_retrieve_body( $request ), 5 );
}
}
return $data;
}
如上所述，这行不通。这是我的小部件，我在其中检查
$username 在做任何事情之前
widget() 作用
<?php
/**
* Plugin Name: Instagram Widget
*/
add_action( \'widget_init\', \'custom_widget_instagram_pictures\');
register_widget( \'custom_widget_instagram_pictures\' );
class custom_widget_instagram_pictures extends Wp_Widget {
/**
* Setup the Widget
*/
public function __construct() {
$widget_ops = array(\'classname\' => \'custom_widget_instagram_pictures\',
\'description\' => esc_html__(\'A widget to display instagram photos.\', \'_s\')
);
$control_ops = array(\'id_base\' => \'custom_widget_instagram_pictures\');
parent::__construct( \'custom_widget_instagram_pictures\', __(\'_s: Instagram Widget\', \'_s_instagram_widget\'), $widget_ops, $control_ops );
}
public function widget( $args, $instance ) {
extract( $args );
$title = isset( $instance[\'title\'] ) ? apply_filters(\'widget_title\', $instance[\'title\'] ) : \'\';
$username = isset( $instance[\'username\'] ) ? $instance[\'username\'] : \'\';
$profile_link = isset( $instance[\'profile_link\'] ) ? $instance[\'profile_link\'] : \'\';
$columns = isset( $instance[\'columns\'] ) ? $instance[ \'columns\'] : \'\';
$save_local = isset( $instance[\'save_local\'] ) ? $instance[\'save_local\'] : \'\';
$number_of_photos = isset( $instance[\'number_of_photos\'] ) ? $instance[\'number_of_photos\'] : \'\';
echo ent2ncr( $before_widget );
if ( $title ) {
echo ent2ncr( $before_title . $title . $after_title );
}
?>
<div class="instagram-widget">
<?php
if( $username ) {
$instagram_object = new Social_Space\\Generate_Instagram_Links( $username, new Social_Space\\Scrape_Instagram );
if ( !$save_local ) {
$instagram_links = $instagram_object->get_instagram_photos_links();
if( is_wp_error( $instagram_links ) ) {
echo "Ouch. Something\'s wrong. Did you enter the right username?";
} else {
$instagram_links_parsed = 0;
?>
<ul class="instagram-widget-list">
<?php
foreach( $instagram_links as $link ) {
if ( $instagram_links_parsed < absint( $number_of_photos ) ) {
$instagram_links_parsed++;
?>
<li class="instagram-thumb instagram-thumb-<?php echo $columns ?>-col">
<a href="<?php echo $link[\'real_link\']; ?>"><img src="<?php echo $link[\'src\']; ?>"/></a>
</li>
<?php
}
else {
break;
}
}
?>
</ul>
<?php
}
}
elseif ( $save_local ) {
$instagram_links = $instagram_object->get_instagram_local_photos_links();
if( is_wp_error( $instagram_links ) ) {
echo "Ouch. Something\'s wrong. Did you enter the right username?";
} else {
$instagram_links_parsed = 0;
?>
<ul class="instagram-widget-list">
<?php
foreach( $instagram_links as $link ) {
if ( $instagram_links_parsed < absint( $number_of_photos ) ) {
$instagram_links_parsed++;
?>
<li class="instagram-thumb instagram-thumb-<?php echo $columns ?>-col">
<a href="<?php echo $link; ?>"><img src="<?php echo $link; ?>"/></a>
</li>
<?php
}
else {
break;
}
}
?>
</ul>
<?php
}
}
} else {
echo _s_setup_widget_notification();
} ?>
<?php if( \'on\' == $profile_link ) : ?>
<button class="instagram-widget-profile-link"><a href="<?php echo \'https://www.instagram.com/\' . $username; ?>"><i class="sf-4"></i><p><?php echo $username ?></p></a></button>
<?php endif; ?>
</div>
<?php
echo ent2ncr( $after_widget );
}
function update( $new_instance, $old_instance ) {
$instance[\'title\'] = ( isset( $new_instance[\'title\'] ) ) ? strip_tags($new_instance[\'title\'] ) : \'\';
$instance[\'username\'] = ( isset( $new_instance[\'username\'] ) ) ? strip_tags( $new_instance[\'username\'] ) : \'\';
$instance[\'profile_link\'] = ( isset( $new_instance[\'profile_link\'] ) ) ? strip_tags( $new_instance[\'profile_link\'] ) : \'\';
$instance[\'columns\'] = ( isset( $new_instance[\'columns\'] ) ) ? strip_tags( $new_instance[\'columns\'] ) : \'\';
$instance[\'save_local\'] = ( isset( $new_instance[\'save_local\'] ) ) ? strip_tags( $new_instance[\'save_local\'] ) : \'\';
$instance[\'number_of_photos\'] = ( isset( $new_instance[\'number_of_photos\'] ) ) ? strip_tags( $new_instance[\'number_of_photos\'] ) : \'\';
return $instance;
}
function form( $instance ) {
$defaults = array( \'title\' => \'\',
\'username\' => \'\',
\'profile_link\' => \'\',
\'columns\' => \'3\',
\'save_local\' => \'\',
\'number_of_photos\' => \'12\',
);
$instance = wp_parse_args( (array) $instance, $defaults ); ?>
<!-- Custom Message -->
<div class="customizer-custom-message-1">
<p>Hey! Just one second. We strongly advise you keep an "even" number of images, 3 columns should have 3,6,9...photos. A 2 columns layout should have 2,4,6 and so on. Looks much better this way! </p>
</div>
<!-- Form for Title -->
<p>
<label for="<?php echo $this->get_field_id( \'title\' ); ?>">Widget Title:<strong>(Leave Blank to Hide)</strong></label>
<br>
<input class="widefat" id="<?php echo $this->get_field_id( \'title\' ); ?>" name="<?php echo $this->get_field_name( \'title\' ); ?>" value="<?php echo $instance[\'title\'];?>" />
</p>
<!-- Form for Username -->
<p>
<label for="<?php echo $this->get_field_id( \'username\' ); ?>">Username:</label>
<br>
<input class="widefat" id="<?php echo $this->get_field_id( \'username\' ); ?>" name="<?php echo $this->get_field_name( \'username\' ); ?>" value="<?php echo $instance[\'username\'];?>" />
</p>
<!-- Checkbox for Local -->
<p>
<input class="checkbox" type="checkbox" <?php checked( $instance[ \'save_local\' ], \'on\' ); ?> id="<?php echo $this->get_field_id( \'save_local\' ); ?>" name="<?php echo $this->get_field_name( \'save_local\' ); ?>" />
<label for="<?php echo $this->get_field_id( \'save_local\' ); ?>">Save Images to Local</label>
</p>
<!-- Checkbox for Profile Link -->
<p>
<input class="checkbox" type="checkbox" <?php checked( $instance[ \'profile_link\' ], \'on\' ); ?> id="<?php echo $this->get_field_id( \'profile_link\' ); ?>" name="<?php echo $this->get_field_name( \'profile_link\' ); ?>" />
<label for="<?php echo $this->get_field_id( \'profile_link\' ); ?>">Show Instagram Button?</label>
</p>
<!-- Columns -->
<p>
<label for="<?php echo $this->get_field_id( \'columns\' ); ?>">How Many Columns to Display?<strong>(Leave Blank to Hide)</strong></label>
<br>
<input class="widefat" id="<?php echo $this->get_field_id( \'columns\' ); ?>" name="<?php echo $this->get_field_name( \'columns\' ); ?>" value="<?php echo $instance[\'columns\'];?>" />
</p>
<!-- Number of Photos -->
<p>
<label for="<?php echo $this->get_field_id( \'number_of_photos\' ); ?>">How Many Pictures?</label>
<br>
<input class="widefat" id="<?php echo $this->get_field_id( \'number_of_photos\' ); ?>" name="<?php echo $this->get_field_name( \'number_of_photos\' ); ?>" value="<?php echo $instance[\'number_of_photos\'];?>" />
</p>
<?php
}
}
