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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 |
|---|---|
| 2388 | * |
| 2389 | * @since 2.3.0 |
| 2390 | * |
| 2391 | * @param mixed $value Value of the prefixed post field. |
| 2392 | * @param int $post_id Post ID. |
| 2393 | * @param string $context Context for how to sanitize the field. Possible |
| 2394 | * values include 'raw', 'edit', 'db', 'display', |
| 2395 | * 'attribute' and 'js'. |
| 2396 | */ |
| 2397 | $value = apply_filters( "{$field}", $value, $post_id, $context ); |
| 2398 | } else { |
| 2399 | $value = apply_filters( "post_{$field}", $value, $post_id, $context ); |
| 2400 | } |
| 2401 | |
| 2402 | if ( 'attribute' == $context ) { |
| 2403 | $value = esc_attr( $value ); |
| 2404 | } elseif ( 'js' == $context ) { |
| 2405 | $value = esc_js( $value ); |
| 2406 | } |