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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.
This hook occurs 9 times in this file.
| Line | Code |
|---|---|
| 3550 | * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits', |
| 3551 | * 'domain_no_periods', 'sub_hyphen_limits', 'sub_invalid_chars', or no specific context. |
| 3552 | * |
| 3553 | * @since 2.8.0 |
| 3554 | * |
| 3555 | * @param string|false $is_email The email address if successfully passed the is_email() checks, false otherwise. |
| 3556 | * @param string $email The email address being checked. |
| 3557 | * @param string $context Context under which the email was tested. |
| 3558 | */ |
| 3559 | return apply_filters( 'is_email', false, $email, 'email_too_short' ); |
| 3560 | } |
| 3561 | |
| 3562 | // Test for an @ character after the first position. |
| 3563 | if ( strpos( $email, '@', 1 ) === false ) { |
| 3564 | /** This filter is documented in wp-includes/formatting.php */ |
| 3565 | return apply_filters( 'is_email', false, $email, 'email_no_at' ); |
| 3566 | } |
| 3567 | |
| 3568 | // Split out the local and domain parts. |
| 3569 | list( $local, $domain ) = explode( '@', $email, 2 ); |
| 3570 | |
| 3571 | /* |
| 3572 | * LOCAL PART |
| 3573 | * Test for invalid characters. |
| 3574 | */ |
| 3575 | if ( ! preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) { |
| 3576 | /** This filter is documented in wp-includes/formatting.php */ |
| 3577 | return apply_filters( 'is_email', false, $email, 'local_invalid_chars' ); |
| 3578 | } |
| 3579 | |
| 3580 | /* |
| 3581 | * DOMAIN PART |
| 3582 | * Test for sequences of periods. |
| 3583 | */ |
| 3584 | if ( preg_match( '/\.{2,}/', $domain ) ) { |
| 3585 | /** This filter is documented in wp-includes/formatting.php */ |
| 3586 | return apply_filters( 'is_email', false, $email, 'domain_period_sequence' ); |
| 3587 | } |
| 3588 | |
| 3589 | // Test for leading and trailing periods and whitespace. |
| 3590 | if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) { |
| 3591 | /** This filter is documented in wp-includes/formatting.php */ |
| 3592 | return apply_filters( 'is_email', false, $email, 'domain_period_limits' ); |
| 3593 | } |
| 3594 | |
| 3595 | // Split the domain into subs. |
| 3596 | $subs = explode( '.', $domain ); |
| 3597 | |
| 3598 | // Assume the domain will have at least two subs. |
| 3599 | if ( 2 > count( $subs ) ) { |
| 3600 | /** This filter is documented in wp-includes/formatting.php */ |
| 3601 | return apply_filters( 'is_email', false, $email, 'domain_no_periods' ); |
| 3602 | } |
| 3603 | |
| 3604 | // Loop through each sub. |
| 3605 | foreach ( $subs as $sub ) { |
| 3606 | // Test for leading and trailing hyphens and whitespace. |
| 3607 | if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) { |
| 3608 | /** This filter is documented in wp-includes/formatting.php */ |
| 3609 | return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' ); |
| 3610 | } |
| 3611 | |
| 3612 | // Test for invalid characters. |
| 3613 | if ( ! preg_match( '/^[a-z0-9-]+$/i', $sub ) ) { |
| 3614 | /** This filter is documented in wp-includes/formatting.php */ |
| 3615 | return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' ); |
| 3616 | } |
| 3617 | } |
| 3618 | |
| 3619 | // Congratulations, your email made it! |
| 3620 | /** This filter is documented in wp-includes/formatting.php */ |
| 3621 | return apply_filters( 'is_email', $email, $email, null ); |
| 3622 | } |
| 3623 | |
| 3624 | /** |
| 3625 | * Converts to ASCII from email subjects. |
| 3626 | * |
| 3627 | * @since 1.2.0 |
| 3628 | * |
| 3629 | * @param string $subject Subject line. |
| 3630 | * @return string Converted string to ASCII. |