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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 |
|---|---|
| 175 | * |
| 176 | * @since 2.9.0 |
| 177 | * |
| 178 | * @see WP_Embed::shortcode() |
| 179 | * |
| 180 | * @param mixed $return The shortcode callback function to call. |
| 181 | * @param string $url The attempted embed URL. |
| 182 | * @param array $attr An array of shortcode attributes. |
| 183 | */ |
| 184 | return apply_filters( 'embed_handler_html', $return, $url, $attr ); |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | $post_ID = ( ! empty( $post->ID ) ) ? $post->ID : null; |
| 190 | |
| 191 | // Potentially set by WP_Embed::cache_oembed(). |
| 192 | if ( ! empty( $this->post_ID ) ) { |
| 193 | $post_ID = $this->post_ID; |