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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 |
|---|---|
| 2471 | * |
| 2472 | * @param mixed $value Value of the prefixed post field. |
| 2473 | * @param int $post_id Post ID. |
| 2474 | * @param string $context Context for how to sanitize the field. Possible |
| 2475 | * values include 'raw', 'edit', 'db', 'display', |
| 2476 | * 'attribute' and 'js'. |
| 2477 | */ |
| 2478 | $value = apply_filters( "{$field}", $value, $post_id, $context ); |
| 2479 | } else { |
| 2480 | $value = apply_filters( "post_{$field}", $value, $post_id, $context ); |
| 2481 | } |
| 2482 | |
| 2483 | if ( 'attribute' == $context ) { |
| 2484 | $value = esc_attr( $value ); |
| 2485 | } elseif ( 'js' == $context ) { |
| 2486 | $value = esc_js( $value ); |
| 2487 | } |
| 2488 | } |
| 2489 | |