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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 |
|---|---|
| 1509 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1510 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1511 | * |
| 1512 | * @since 2.9.0 |
| 1513 | * |
| 1514 | * @param mixed $value The user object value to sanitize. |
| 1515 | * @param int $user_id User ID. |
| 1516 | * @param string $context The context to filter within. |
| 1517 | */ |
| 1518 | $value = apply_filters( "user_{$field}", $value, $user_id, $context ); |
| 1519 | } |
| 1520 | } |
| 1521 | |
| 1522 | if ( 'user_url' === $field ) { |
| 1523 | $value = esc_url( $value ); |
| 1524 | } |
| 1525 | |
| 1526 | if ( 'attribute' === $context ) { |
| 1527 | $value = esc_attr( $value ); |