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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 | * Filter the returned embed handler. |
158 | * |
159 | * @since 2.9.0 |
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. |