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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 |
|---|---|
| 2873 | * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits', |
| 2874 | * 'domain_no_periods', 'sub_hyphen_limits', 'sub_invalid_chars', or no specific context. |
| 2875 | * |
| 2876 | * @since 2.8.0 |
| 2877 | * |
| 2878 | * @param bool $is_email Whether the email address has passed the is_email() checks. Default false. |
| 2879 | * @param string $email The email address being checked. |
| 2880 | * @param string $context Context under which the email was tested. |
| 2881 | */ |
| 2882 | return apply_filters( 'is_email', false, $email, 'email_too_short' ); |
| 2883 | } |
| 2884 | |
| 2885 | // Test for an @ character after the first position |
| 2886 | if ( strpos( $email, '@', 1 ) === false ) { |
| 2887 | /** This filter is documented in wp-includes/formatting.php */ |
| 2888 | return apply_filters( 'is_email', false, $email, 'email_no_at' ); |
| 2889 | } |
| 2890 | |
| 2891 | // Split out the local and domain parts |
| 2892 | list( $local, $domain ) = explode( '@', $email, 2 ); |
| 2893 | |
| 2894 | // LOCAL PART |
| 2895 | // Test for invalid characters |
| 2896 | if ( !preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) { |
| 2897 | /** This filter is documented in wp-includes/formatting.php */ |
| 2898 | return apply_filters( 'is_email', false, $email, 'local_invalid_chars' ); |
| 2899 | } |
| 2900 | |
| 2901 | // DOMAIN PART |
| 2902 | // Test for sequences of periods |
| 2903 | if ( preg_match( '/\.{2,}/', $domain ) ) { |
| 2904 | /** This filter is documented in wp-includes/formatting.php */ |
| 2905 | return apply_filters( 'is_email', false, $email, 'domain_period_sequence' ); |
| 2906 | } |
| 2907 | |
| 2908 | // Test for leading and trailing periods and whitespace |
| 2909 | if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) { |
| 2910 | /** This filter is documented in wp-includes/formatting.php */ |
| 2911 | return apply_filters( 'is_email', false, $email, 'domain_period_limits' ); |
| 2912 | } |
| 2913 | |
| 2914 | // Split the domain into subs |
| 2915 | $subs = explode( '.', $domain ); |
| 2916 | |
| 2917 | // Assume the domain will have at least two subs |
| 2918 | if ( 2 > count( $subs ) ) { |
| 2919 | /** This filter is documented in wp-includes/formatting.php */ |
| 2920 | return apply_filters( 'is_email', false, $email, 'domain_no_periods' ); |
| 2921 | } |
| 2922 | |
| 2923 | // Loop through each sub |
| 2924 | foreach ( $subs as $sub ) { |
| 2925 | // Test for leading and trailing hyphens and whitespace |
| 2926 | if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) { |
| 2927 | /** This filter is documented in wp-includes/formatting.php */ |
| 2928 | return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' ); |
| 2929 | } |
| 2930 | |
| 2931 | // Test for invalid characters |
| 2932 | if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) { |
| 2933 | /** This filter is documented in wp-includes/formatting.php */ |
| 2934 | return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' ); |
| 2935 | } |
| 2936 | } |
| 2937 | |
| 2938 | // Congratulations your email made it! |
| 2939 | /** This filter is documented in wp-includes/formatting.php */ |
| 2940 | return apply_filters( 'is_email', $email, $email, null ); |
| 2941 | } |
| 2942 | |
| 2943 | /** |
| 2944 | * Convert to ASCII from email subjects. |
| 2945 | * |
| 2946 | * @since 1.2.0 |
| 2947 | * |
| 2948 | * @param string $string Subject line |
| 2949 | * @return string Converted string to ASCII |