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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 |
|---|---|
| 412 | |
| 413 | /** |
| 414 | * Filters whether an email address is unsafe. |
| 415 | * |
| 416 | * @since 3.5.0 |
| 417 | * |
| 418 | * @param bool $is_email_address_unsafe Whether the email address is "unsafe". Default false. |
| 419 | * @param string $user_email User email address. |
| 420 | */ |
| 421 | return apply_filters( 'is_email_address_unsafe', $is_email_address_unsafe, $user_email ); |
| 422 | } |
| 423 | |
| 424 | /** |
| 425 | * Sanitize and validate data required for a user sign-up. |
| 426 | * |
| 427 | * Verifies the validity and uniqueness of user names and user email addresses, |
| 428 | * and checks email addresses against admin-provided domain whitelists and blacklists. |
| 429 | * |
| 430 | * The {@see 'wpmu_validate_user_signup'} hook provides an easy way to modify the sign-up |