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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 |
|---|---|
| 378 | |
| 379 | /** |
| 380 | * Filters whether an email address is unsafe. |
| 381 | * |
| 382 | * @since 3.5.0 |
| 383 | * |
| 384 | * @param bool $is_email_address_unsafe Whether the email address is "unsafe". Default false. |
| 385 | * @param string $user_email User email address. |
| 386 | */ |
| 387 | return apply_filters( 'is_email_address_unsafe', $is_email_address_unsafe, $user_email ); |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * Sanitize and validate data required for a user sign-up. |
| 392 | * |
| 393 | * Verifies the validity and uniqueness of user names and user email addresses, |
| 394 | * and checks email addresses against admin-provided domain whitelists and blacklists. |
| 395 | * |
| 396 | * The {@see 'wpmu_validate_user_signup'} hook provides an easy way to modify the sign-up |