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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 |
|---|---|
| 433 | |
| 434 | /** |
| 435 | * Filter whether an email address is unsafe. |
| 436 | * |
| 437 | * @since 3.5.0 |
| 438 | * |
| 439 | * @param bool $is_email_address_unsafe Whether the email address is "unsafe". Default false. |
| 440 | * @param string $user_email User email address. |
| 441 | */ |
| 442 | return apply_filters( 'is_email_address_unsafe', $is_email_address_unsafe, $user_email ); |
| 443 | } |
| 444 | |
| 445 | /** |
| 446 | * Sanitize and validate data required for a user sign-up. |
| 447 | * |
| 448 | * Verifies the validity and uniqueness of user names and user email addresses, |
| 449 | * and checks email addresses against admin-provided domain whitelists and blacklists. |
| 450 | * |
| 451 | * The {@see 'wpmu_validate_user_signup'} hook provides an easy way to modify the sign-up |