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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 |
|---|---|
| 1524 | * Filter the value of a user field in the 'db' context. |
| 1525 | * |
| 1526 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1527 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1528 | * |
| 1529 | * @since 2.9.0 |
| 1530 | * |
| 1531 | * @param mixed $value Value of the prefixed user field. |
| 1532 | */ |
| 1533 | $value = apply_filters( "pre_user_{$field}", $value ); |
| 1534 | } |
| 1535 | } else { |
| 1536 | // Use display filters by default. |
| 1537 | if ( $prefixed ) { |
| 1538 | |
| 1539 | /** This filter is documented in wp-includes/post.php */ |
| 1540 | $value = apply_filters( $field, $value, $user_id, $context ); |
| 1541 | } else { |
| 1542 | |