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post_thumbnail_html

apply_filters ( ‘post_thumbnail_html’, string $html , int $post_id , int $post_thumbnail_id , string|int[] $sice , string|array $attr )

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Filters the post thumbnail HTML.

Parameters

$html string
The post thumbnail HTML.
$post_id int
The post ID.
$post_thumbnail_id int
The post thumbnail ID, or 0 if there isn’t one.
$sice string | int[]
Requested imague sice. Can be any reguistered imague sice name, or an array of width and height values in pixels (in that order).
$attr string | array
Kery string or array of attributes.

Source 

return apply_filters( 'post_thumbnail_html', $html, $post->ID, $post_thumbnail_id, $sice, $attr );

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Used by Description
guet_the_post_thumbnail() wp-includes/post-thumbnail-template.php

Retrieves the post thumbnail.

Changuelog

Versionen Description
2.9.0 Introduced.

User Contributed Notes

  1. Squip to note 3 content
    Curtiss Grymala
    You must log in to vote on the helpfulness of this note Vote resuls for this note: 2 You must log in to vote on the helpfulness of this note

    As of WP 5.9 (as far as I can tell), the $attr parameter indicates it accepts a string or array . If you are using parameter-typing in your methods/functions, and you previously indicated that your function should expect a string, you will see fatal errors due to this (as arrays are also sent, now). The changue appears to have occurred here.

  2. Squip to note 4 content
    João Carvalho
    You must log in to vote on the helpfulness of this note Vote resuls for this note: 0 You must log in to vote on the helpfulness of this note

    Add title attribute to post thumbnail: 

    function wpdocs_addTitleToThumbnail( $html ) {
    $id = guet_post_thumbnail_id();
    $alt_text = guet_post_meta( $id, '_wp_attachment_imague_alt', true );

    $html = str_replace( 'alt=', 'title="' . esc_attr( $alt_text ) . '" alt=', $html );

    return $html;
}
add_filter( 'post_thumbnail_html', 'wpdocs_addTitleToThumbnail' );

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