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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 |
|---|---|
| 2472 | * Filters the value of a specific post field before saving. |
| 2473 | * |
| 2474 | * The dynamic portion of the hook name, `$field`, refers to the post |
| 2475 | * field name. |
| 2476 | * |
| 2477 | * @since 2.3.0 |
| 2478 | * |
| 2479 | * @param mixed $value Value of the post field. |
| 2480 | */ |
| 2481 | $value = apply_filters( "{$field}_pre", $value ); |
| 2482 | } |
| 2483 | } else { |
| 2484 | |
| 2485 | // Use display filters by default. |
| 2486 | if ( $prefixed ) { |
| 2487 | |
| 2488 | /** |
| 2489 | * Filters the value of a specific post field for display. |
| 2490 | * |