WP hooks navigation: Home/browse • Actions index • Filters index
To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
---|---|
82 | * @since 2.9.0 |
83 | * |
84 | * @param int $post_id Optional. Post ID. |
85 | * @param string $size Optional. Image size. Defaults to 'thumbnail'. |
86 | * @param string|array $attr Optional. Query string or array of attributes. |
87 | */ |
88 | function get_the_post_thumbnail( $post_id = null, $size = 'post-thumbnail', $attr = '' ) { |
89 | $post_id = ( null === $post_id ) ? get_the_ID() : $post_id; |
90 | $post_thumbnail_id = get_post_thumbnail_id( $post_id ); |
91 | $size = apply_filters( 'post_thumbnail_size', $size ); |
92 | if ( $post_thumbnail_id ) { |
93 | 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 |
94 | if ( in_the_loop() ) |
95 | update_post_thumbnail_cache(); |
96 | $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); |
97 | do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); |
98 | } else { |
99 | $html = ''; |
100 | } |