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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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105 | $post_thumbnail_id = get_post_thumbnail_id( $post_id ); |
106 |
|
107 | /** |
108 | * Filter the post thumbnail size. |
109 | * |
110 | * @since 2.9.0 |
111 | * |
112 | * @param string $size The post thumbnail size. |
113 | */ |
114 | $size = apply_filters( 'post_thumbnail_size', $size ); |
115 |
|
116 | if ( $post_thumbnail_id ) { |
117 |
|
118 | /** |
119 | * Fires before fetching the post thumbnail HTML. |
120 | * |
121 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
122 | * |
123 | * @since 2.9.0 |