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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
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56 | * |
57 | * @param int $post_id Optional. Post ID. |
58 | * @param string $size Optional. Image size. Defaults to 'thumbnail'. |
59 | * @param string|array $attr Optional. Query string or array of attributes. |
60 | */ |
61 | function get_the_post_thumbnail( $post_id = NULL, $size = 'post-thumbnail', $attr = '' ) { |
62 | global $id; |
63 | $post_id = ( NULL === $post_id ) ? $id : $post_id; |
64 | $post_thumbnail_id = get_post_thumbnail_id( $post_id ); |
65 | $size = apply_filters( 'post_thumbnail_size', $size ); |
66 | if ( $post_thumbnail_id ) { |
67 | do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); // for "Just In Time" filtering of all of wp_get_attachment_image()'s filters |
68 | $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); |
69 | do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); |
70 | } else { |
71 | $html = ''; |
72 | } |
73 | return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr ); |
74 | } |