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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 |
|---|---|
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Filters whether JSONP is enabled for the REST API. |
| 297 | * |
| 298 | * @since 4.4.0 |
| 299 | * |
| 300 | * @param bool $jsonp_enabled Whether JSONP is enabled. Default true. |
| 301 | */ |
| 302 | $jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true ); |
| 303 | |
| 304 | $jsonp_callback = false; |
| 305 | if ( isset( $_GET['_jsonp'] ) ) { |
| 306 | $jsonp_callback = $_GET['_jsonp']; |
| 307 | } |
| 308 | |
| 309 | $content_type = ( $jsonp_callback && $jsonp_enabled ) ? 'application/javascript' : 'application/json'; |
| 310 | $this->send_header( 'Content-Type', $content_type . '; charset=' . get_option( 'blog_charset' ) ); |
| 311 | $this->send_header( 'X-Robots-Tag', 'noindex' ); |