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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 |
|---|---|
| 1424 | if ( !is_string($value) && !is_numeric($value) ) |
| 1425 | return $value; |
| 1426 | |
| 1427 | $prefixed = false !== strpos( $field, 'user_' ); |
| 1428 | |
| 1429 | if ( 'edit' == $context ) { |
| 1430 | if ( $prefixed ) { |
| 1431 | |
| 1432 | /** This filter is documented in wp-includes/post.php */ |
| 1433 | $value = apply_filters( "edit_{$field}", $value, $user_id ); |
| 1434 | } else { |
| 1435 | |
| 1436 | /** |
| 1437 | * Filter a user field value in the 'edit' context. |
| 1438 | * |
| 1439 | * The dynamic portion of the hook name, $field, refers to the prefixed user |
| 1440 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1441 | * |
| 1442 | * @since 2.9.0 |