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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 |
|---|---|
| 2507 | * |
| 2508 | * @param mixed $value Value of the prefixed post field. |
| 2509 | * @param int $post_id Post ID. |
| 2510 | * @param string $context Context for how to sanitize the field. Possible |
| 2511 | * values include 'edit', 'display', |
| 2512 | * 'attribute' and 'js'. |
| 2513 | */ |
| 2514 | $value = apply_filters( "{$field}", $value, $post_id, $context ); |
| 2515 | } else { |
| 2516 | $value = apply_filters( "post_{$field}", $value, $post_id, $context ); |
| 2517 | } |
| 2518 | |
| 2519 | if ( 'attribute' === $context ) { |
| 2520 | $value = esc_attr( $value ); |
| 2521 | } elseif ( 'js' === $context ) { |
| 2522 | $value = esc_js( $value ); |
| 2523 | } |
| 2524 | } |
| 2525 | |