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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 |
|---|---|
| 156 | * |
| 157 | * @since 2.9.0 |
| 158 | * |
| 159 | * @see WP_Embed::shortcode() |
| 160 | * |
| 161 | * @param mixed $return The shortcode callback function to call. |
| 162 | * @param string $url The attempted embed URL. |
| 163 | * @param array $attr An array of shortcode attributes. |
| 164 | */ |
| 165 | return apply_filters( 'embed_handler_html', $return, $url, $attr ); |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | $post_ID = ( ! empty( $post->ID ) ) ? $post->ID : null; |
| 171 | if ( ! empty( $this->post_ID ) ) // Potentially set by WP_Embed::cache_oembed() |
| 172 | $post_ID = $this->post_ID; |
| 173 | |
| 174 | // Unknown URL format. Let oEmbed have a go. |