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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 8 times in this file.
| Line | Code |
|---|---|
| 2361 | * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits', |
| 2362 | * 'domain_no_periods', 'domain_no_valid_subs', or no context. |
| 2363 | * |
| 2364 | * @since 2.8.0 |
| 2365 | * |
| 2366 | * @param string $email The sanitized email address. |
| 2367 | * @param string $email The email address, as provided to sanitize_email(). |
| 2368 | * @param string $message A message to pass to the user. |
| 2369 | */ |
| 2370 | return apply_filters( 'sanitize_email', '', $email, 'email_too_short' ); |
| 2371 | } |
| 2372 | |
| 2373 | // Test for an @ character after the first position |
| 2374 | if ( strpos( $email, '@', 1 ) === false ) { |
| 2375 | /** This filter is documented in wp-includes/formatting.php */ |
| 2376 | return apply_filters( 'sanitize_email', '', $email, 'email_no_at' ); |
| 2377 | } |
| 2378 | |
| 2379 | // Split out the local and domain parts |
| 2380 | list( $local, $domain ) = explode( '@', $email, 2 ); |
| 2381 | |
| 2382 | // LOCAL PART |
| 2383 | // Test for invalid characters |
| 2384 | $local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local ); |
| 2385 | if ( '' === $local ) { |
| 2386 | /** This filter is documented in wp-includes/formatting.php */ |
| 2387 | return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' ); |
| 2388 | } |
| 2389 | |
| 2390 | // DOMAIN PART |
| 2391 | // Test for sequences of periods |
| 2392 | $domain = preg_replace( '/\.{2,}/', '', $domain ); |
| 2393 | if ( '' === $domain ) { |
| 2394 | /** This filter is documented in wp-includes/formatting.php */ |
| 2395 | return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' ); |
| 2396 | } |
| 2397 | |
| 2398 | // Test for leading and trailing periods and whitespace |
| 2399 | $domain = trim( $domain, " \t\n\r\0\x0B." ); |
| 2400 | if ( '' === $domain ) { |
| 2401 | /** This filter is documented in wp-includes/formatting.php */ |
| 2402 | return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' ); |
| 2403 | } |
| 2404 | |
| 2405 | // Split the domain into subs |
| 2406 | $subs = explode( '.', $domain ); |
| 2407 | |
| 2408 | // Assume the domain will have at least two subs |
| 2409 | if ( 2 > count( $subs ) ) { |
| 2410 | /** This filter is documented in wp-includes/formatting.php */ |
| 2411 | return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' ); |
| 2412 | } |
| 2413 | |
| 2414 | // Create an array that will contain valid subs |
| 2415 | $new_subs = array(); |
| 2416 | |
| 2417 | // Loop through each sub |
| 2418 | foreach ( $subs as $sub ) { |
| 2419 | // Test for leading and trailing hyphens |
| 2420 | $sub = trim( $sub, " \t\n\r\0\x0B-" ); |
| Line | Code |
| 2425 | // If there's anything left, add it to the valid subs |
| 2426 | if ( '' !== $sub ) { |
| 2427 | $new_subs[] = $sub; |
| 2428 | } |
| 2429 | } |
| 2430 | |
| 2431 | // If there aren't 2 or more valid subs |
| 2432 | if ( 2 > count( $new_subs ) ) { |
| 2433 | /** This filter is documented in wp-includes/formatting.php */ |
| 2434 | return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' ); |
| 2435 | } |
| 2436 | |
| 2437 | // Join valid subs into the new domain |
| 2438 | $domain = join( '.', $new_subs ); |
| 2439 | |
| 2440 | // Put the email back together |
| 2441 | $email = $local . '@' . $domain; |
| 2442 | |
| 2443 | // Congratulations your email made it! |
| 2444 | /** This filter is documented in wp-includes/formatting.php */ |
| 2445 | return apply_filters( 'sanitize_email', $email, $email, null ); |
| 2446 | } |
| 2447 | |
| 2448 | /** |
| 2449 | * Determines the difference between two timestamps. |
| 2450 | * |
| 2451 | * The difference is returned in a human readable format such as "1 hour", |
| 2452 | * "5 mins", "2 days". |
| 2453 | * |
| 2454 | * @since 1.5.0 |