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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 |
|---|---|
| 1546 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1547 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1548 | * |
| 1549 | * @since 2.9.0 |
| 1550 | * |
| 1551 | * @param mixed $value The user object value to sanitize. |
| 1552 | * @param int $user_id User ID. |
| 1553 | * @param string $context The context to filter within. |
| 1554 | */ |
| 1555 | $value = apply_filters( "user_{$field}", $value, $user_id, $context ); |
| 1556 | } |
| 1557 | } |
| 1558 | |
| 1559 | if ( 'user_url' == $field ) |
| 1560 | $value = esc_url($value); |
| 1561 | |
| 1562 | if ( 'attribute' == $context ) |
| 1563 | $value = esc_attr($value); |
| 1564 | else if ( 'js' == $context ) |