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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 |
|---|---|
| 220 | * @since 4.0.0 |
| 221 | * |
| 222 | * @see wp_embed_handler_youtube() |
| 223 | * |
| 224 | * @param string $embed YouTube embed output. |
| 225 | * @param array $attr An array of embed attributes. |
| 226 | * @param string $url The original URL that was matched by the regex. |
| 227 | * @param array $rawattr The original unmodified attributes. |
| 228 | */ |
| 229 | return apply_filters( 'wp_embed_handler_youtube', $embed, $attr, $url, $rawattr ); |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Audio embed handler callback. |
| 234 | * |
| 235 | * @since 3.6.0 |
| 236 | * |
| 237 | * @param array $matches The RegEx matches from the provided regex when calling wp_embed_register_handler(). |
| 238 | * @param array $attr Embed attributes. |