Come si imposta un'immagine in primo piano (miniatura) in base all'URL dell'immagine quando si utilizza wp_insert_post ()?

Puoiimpostare un'immagine comeminiatura delpost quando ènellatua libreriamultimediale. Per aggiungere un'immaginenellatua libreriamultimediale devi caricarla sultuo server. WordPress hagià unafunzioneperinserire leimmagininellatua libreriamultimediale,hai solobisogno di uno script che carichiiltuofile.

Utilizzo:

 Generate_Featured_Image( '../wp-content/my_image.jpg', $post_id );

// $post_id is Numeric ID... You can also get the ID with:
wp_insert_post()
 

Funzione:

 function Generate_Featured_Image( $image_url, $post_id  ){
    $upload_dir = wp_upload_dir();
    $image_data = file_get_contents($image_url);
    $filename = basename($image_url);
    if(wp_mkdir_p($upload_dir['path']))
      $file = $upload_dir['path'] . '/' . $filename;
    else
      $file = $upload_dir['basedir'] . '/' . $filename;
    file_put_contents($file, $image_data);

    $wp_filetype = wp_check_filetype($filename, null );
    $attachment = array(
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => sanitize_file_name($filename),
        'post_content' => '',
        'post_status' => 'inherit'
    );
    $attach_id = wp_insert_attachment( $attachment, $file, $post_id );
    require_once(ABSPATH . 'wp-admin/includes/image.php');
    $attach_data = wp_generate_attachment_metadata( $attach_id, $file );
    $res1= wp_update_attachment_metadata( $attach_id, $attach_data );
    $res2= set_post_thumbnail( $post_id, $attach_id );
}
 

http://codex.wordpress.org/Function_Reference/wp_upload_dir

http://codex.wordpress.org/Function_Reference/wp_insert_attachment

MODIFICA: Aggiunta creazione delpercorso

http://codex.wordpress.org/Function_Reference/wp_mkdir_p

You can set an image as post thumbnail when it is in your media library. To add an image in your media library you need to upload it to your server. WordPress already has a function for putting images in your media library, you only need a script that uploads your file.

Usage:

Generate_Featured_Image( '../wp-content/my_image.jpg', $post_id );

// $post_id is Numeric ID... You can also get the ID with:
wp_insert_post()

Function:

function Generate_Featured_Image( $image_url, $post_id  ){
    $upload_dir = wp_upload_dir();
    $image_data = file_get_contents($image_url);
    $filename = basename($image_url);
    if(wp_mkdir_p($upload_dir['path']))
      $file = $upload_dir['path'] . '/' . $filename;
    else
      $file = $upload_dir['basedir'] . '/' . $filename;
    file_put_contents($file, $image_data);

    $wp_filetype = wp_check_filetype($filename, null );
    $attachment = array(
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => sanitize_file_name($filename),
        'post_content' => '',
        'post_status' => 'inherit'
    );
    $attach_id = wp_insert_attachment( $attachment, $file, $post_id );
    require_once(ABSPATH . 'wp-admin/includes/image.php');
    $attach_data = wp_generate_attachment_metadata( $attach_id, $file );
    $res1= wp_update_attachment_metadata( $attach_id, $attach_data );
    $res2= set_post_thumbnail( $post_id, $attach_id );
}

http://codex.wordpress.org/Function_Reference/wp_upload_dir

http://codex.wordpress.org/Function_Reference/wp_insert_attachment

EDIT: Added path creation

http://codex.wordpress.org/Function_Reference/wp_mkdir_p

Vorreimigliorare la risposta di Robs utilizzando lefunzioniprincipali di WP download_url e media_handle_sideload

 <?php
/**
* Downloads an image from the specified URL and attaches it to a post as a post thumbnail.
*
* @param string $file    The URL of the image to download.
* @param int    $post_id The post ID the post thumbnail is to be associated with.
* @param string $desc    Optional. Description of the image.
* @return string|WP_Error Attachment ID, WP_Error object otherwise.
*/
function Generate_Featured_Image( $file, $post_id, $desc ){
    // Set variables for storage, fix file filename for query strings.
    preg_match( '/[^\?]+\.(jpe?g|jpe|gif|png)\b/i', $file, $matches );
    if ( ! $matches ) {
         return new WP_Error( 'image_sideload_failed', __( 'Invalid image URL' ) );
    }

    $file_array = array();
    $file_array['name'] = basename( $matches[0] );

    // Download file to temp location.
    $file_array['tmp_name'] = download_url( $file );

    // If error storing temporarily, return the error.
    if ( is_wp_error( $file_array['tmp_name'] ) ) {
        return $file_array['tmp_name'];
    }

    // Do the validation and storage stuff.
    $id = media_handle_sideload( $file_array, $post_id, $desc );

    // If error storing permanently, unlink.
    if ( is_wp_error( $id ) ) {
        @unlink( $file_array['tmp_name'] );
        return $id;
    }
    return set_post_thumbnail( $post_id, $id );

}
 

I'd like to improve Robs answer by utilizing the WP core functions download_url and media_handle_sideload

<?php
/**
* Downloads an image from the specified URL and attaches it to a post as a post thumbnail.
*
* @param string $file    The URL of the image to download.
* @param int    $post_id The post ID the post thumbnail is to be associated with.
* @param string $desc    Optional. Description of the image.
* @return string|WP_Error Attachment ID, WP_Error object otherwise.
*/
function Generate_Featured_Image( $file, $post_id, $desc ){
    // Set variables for storage, fix file filename for query strings.
    preg_match( '/[^\?]+\.(jpe?g|jpe|gif|png)\b/i', $file, $matches );
    if ( ! $matches ) {
         return new WP_Error( 'image_sideload_failed', __( 'Invalid image URL' ) );
    }

    $file_array = array();
    $file_array['name'] = basename( $matches[0] );

    // Download file to temp location.
    $file_array['tmp_name'] = download_url( $file );

    // If error storing temporarily, return the error.
    if ( is_wp_error( $file_array['tmp_name'] ) ) {
        return $file_array['tmp_name'];
    }

    // Do the validation and storage stuff.
    $id = media_handle_sideload( $file_array, $post_id, $desc );

    // If error storing permanently, unlink.
    if ( is_wp_error( $id ) ) {
        @unlink( $file_array['tmp_name'] );
        return $id;
    }
    return set_post_thumbnail( $post_id, $id );

}

Prova a utilizzare set_post_thumbnail() .

Modifica di Otto: hai chiarito latua domanda,quindi chiarirò la risposta che Chip ha dato.

Fondamentalmente,devi creare anche l '"allegato"perilpost. Quando un'immagine viene caricatanella libreriamultimediale di WordPress,viene creata una voce dipost speciale con untipo di allegato dipost. Questo allegato è collegato a unpost specificotramite l'identificatorepost_parent.

Quindi,se conosci l'ID dell'allegato,chiamare set_post_thumbnail con l'oggetto o l'ID delposte l'ID dell'allegatoimposterà semplicementeilflag dellaminiatura delpost.

Senon hai ancora creato l'allegato,dovraiprimafarlo. Ilmodopiù sempliceperfarlo è con wp_insert_attachment() . Questafunzione accetta un array dipochiparametri,ilnome delfile (ilfile deveesseregiànella corretta directory dei caricamenti)e l'ID delpostprincipale a cui si desidera allegare l'allegato.

Il solo caricamento di unfilee l'allegato a unpostnonfanulla automaticamente. Questo è semplicemente una sorta dimeccanismo di categorizzazione. Ilmeccanismo dellagalleria,adesempio,utilizza leimmagini allegate di unpostper costruire la [galleria]per quelpost. Unaminiaturaper unpost è solo una delleimmagini allegate che è stataimpostata comeminiatura.

Maggioriinformazioni su come usare wp_insert_attachmentpossonoesseretrovatenel codice (linkato sopra).

Try using set_post_thumbnail().

Edit by Otto: You clarified your question, so I'll clarify the response Chip gave.

Basically, you need to make the 'attachment' for the post as well. When an image is uploaded into the WordPress media library, a special post entry is made for it with a post type of attachment. This attachment is linked to some specific post via the post_parent identifier.

So if you know the ID of the attachment, then calling set_post_thumbnail with the post object or ID and the attachment ID will simply set the post thumbnail flag.

If you have not created the attachment yet, then you will need to do that first. Easiest way to do that is with wp_insert_attachment(). This function takes an array of a few parameters, the filename (the file must already be in the proper uploads directory), and the post ID of the parent post that you want to attach the attachment to.

Just having a file uploaded and attached to a post doesn't do anything automatically. This is simply a sort of categorization mechanism. The gallery mechanism, for example, uses the attached images of a post to build the [gallery] for that post. A thumbnail for a post is just one of the attached images which has be set to be the thumbnail.

More info on how to use wp_insert_attachment can be found in the codex (linked above).

set_post_thumbnail() è lafunzionemiglioreper questo requisito.

Penso chetrovi l'ID di un allegatotramite get_children() o get_posts() . Il risultato ha un arraye all'interno di questo array c'è l'ID. Il seguenteesempioperiltest; spero chefunzioni; scrivi senzatest,solo su zero.

Per letueesigenze èimportante che cambi get_the_ID() coniltuo post-ID; restituisci l'ID dell'allegatoe questopuoi usarefoth set_post_thumbnail().

 $attachments = get_children( 
    array(
        'post_parent' => get_the_ID(), 
        'post_type' => 'attachment', 
        'post_mime_type' => 'image'
    )
);
foreach ( $attachments as $attachment_id => $attachment ) {
    echo wp_get_attachment_image($attachment_id);
}
 

set_post_thumbnail() is the best function for this requirement.

I think, you find the ID of an attachment via get_children() or get_posts(). The result have an array and inside this array is the ID. The follow example for testing; i hope it works; write without tests, only on scratch.

For your requirement it is important, that you change get_the_ID() with your post-ID; return the ID of the Attachment and this can you use foth set_post_thumbnail().

$attachments = get_children( 
    array(
        'post_parent' => get_the_ID(), 
        'post_type' => 'attachment', 
        'post_mime_type' => 'image'
    )
);
foreach ( $attachments as $attachment_id => $attachment ) {
    echo wp_get_attachment_image($attachment_id);
}

Ho appenatrovato questoe l'ho resomoltopiù semplice,funzionamanon sono unpulitore della sicurezza

 if(!empty($_FILES)){
    require_once( ABSPATH . 'wp-admin/includes/post.php' );
    require_once( ABSPATH . 'wp-admin/includes/image.php' );
    require_once( ABSPATH . 'wp-admin/includes/file.php' );
    require_once( ABSPATH . 'wp-admin/includes/media.php' );

    $post_ID = "your post id!";

    $attachment_id = media_handle_upload( 'file', $post_ID );
    set_post_thumbnail( $post_ID, $attachment_id );
}
 

semplice o cosa?dopo aver ottenutoi filegiusti,wordpressgestiràil supportoe lo caricherà,quindi loimposterà comeminiatura.

Just found this and made it much simpler, works but I'm no security scrubber

if(!empty($_FILES)){
    require_once( ABSPATH . 'wp-admin/includes/post.php' );
    require_once( ABSPATH . 'wp-admin/includes/image.php' );
    require_once( ABSPATH . 'wp-admin/includes/file.php' );
    require_once( ABSPATH . 'wp-admin/includes/media.php' );

    $post_ID = "your post id!";

    $attachment_id = media_handle_upload( 'file', $post_ID );
    set_post_thumbnail( $post_ID, $attachment_id );
}

simple or what? after getting the right files, wordpress will handle the media and upload it, then set it as a thumbnail.