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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 |
|---|---|
| 120 | |
| 121 | /** |
| 122 | * Filter the post thumbnail size. |
| 123 | * |
| 124 | * @since 2.9.0 |
| 125 | * |
| 126 | * @param string|array $size The post thumbnail size. Image size or array of width and height |
| 127 | * values (in that order). Default 'post-thumbnail'. |
| 128 | */ |
| 129 | $size = apply_filters( 'post_thumbnail_size', $size ); |
| 130 | |
| 131 | if ( $post_thumbnail_id ) { |
| 132 | |
| 133 | /** |
| 134 | * Fires before fetching the post thumbnail HTML. |
| 135 | * |
| 136 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
| 137 | * |
| 138 | * @since 2.9.0 |