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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 |
|---|---|
| 1674 | * Filter the value of a user field in the 'db' context. |
| 1675 | * |
| 1676 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1677 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1678 | * |
| 1679 | * @since 2.9.0 |
| 1680 | * |
| 1681 | * @param mixed $value Value of the prefixed user field. |
| 1682 | */ |
| 1683 | $value = apply_filters( "pre_user_{$field}", $value ); |
| 1684 | } |
| 1685 | } else { |
| 1686 | // Use display filters by default. |
| 1687 | if ( $prefixed ) { |
| 1688 | |
| 1689 | /** This filter is documented in wp-includes/post.php */ |
| 1690 | $value = apply_filters( $field, $value, $user_id, $context ); |
| 1691 | } else { |
| 1692 | |