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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 |
|---|---|
| 153 | * |
| 154 | * @since 2.9.0 |
| 155 | * |
| 156 | * @param string $html The post thumbnail HTML. |
| 157 | * @param string $post_id The post ID. |
| 158 | * @param string $post_thumbnail_id The post thumbnail ID. |
| 159 | * @param string $size The post thumbnail size. |
| 160 | * @param string $attr Query string of attributes. |
| 161 | */ |
| 162 | return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr ); |
| 163 | } |
| 164 | |