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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 |
|---|---|
| 2199 | * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits', |
| 2200 | * 'domain_no_periods', 'domain_no_valid_subs', or no context. |
| 2201 | * |
| 2202 | * @since 2.8.0 |
| 2203 | * |
| 2204 | * @param string $email The sanitized email address. |
| 2205 | * @param string $email The email address, as provided to sanitize_email(). |
| 2206 | * @param string $message A message to pass to the user. |
| 2207 | */ |
| 2208 | return apply_filters( 'sanitize_email', '', $email, 'email_too_short' ); |
| 2209 | } |
| 2210 | |
| 2211 | // Test for an @ character after the first position |
| 2212 | if ( strpos( $email, '@', 1 ) === false ) { |
| 2213 | /** This filter is documented in wp-includes/formatting.php */ |
| 2214 | return apply_filters( 'sanitize_email', '', $email, 'email_no_at' ); |
| 2215 | } |
| 2216 | |
| 2217 | // Split out the local and domain parts |
| 2218 | list( $local, $domain ) = explode( '@', $email, 2 ); |
| 2219 | |
| 2220 | // LOCAL PART |
| 2221 | // Test for invalid characters |
| 2222 | $local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local ); |
| 2223 | if ( '' === $local ) { |
| 2224 | /** This filter is documented in wp-includes/formatting.php */ |
| 2225 | return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' ); |
| 2226 | } |
| 2227 | |
| 2228 | // DOMAIN PART |
| 2229 | // Test for sequences of periods |
| 2230 | $domain = preg_replace( '/\.{2,}/', '', $domain ); |
| 2231 | if ( '' === $domain ) { |
| 2232 | /** This filter is documented in wp-includes/formatting.php */ |
| 2233 | return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' ); |
| 2234 | } |
| 2235 | |
| 2236 | // Test for leading and trailing periods and whitespace |
| 2237 | $domain = trim( $domain, " \t\n\r\0\x0B." ); |
| 2238 | if ( '' === $domain ) { |
| 2239 | /** This filter is documented in wp-includes/formatting.php */ |
| 2240 | return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' ); |
| 2241 | } |
| 2242 | |
| 2243 | // Split the domain into subs |
| 2244 | $subs = explode( '.', $domain ); |
| 2245 | |
| 2246 | // Assume the domain will have at least two subs |
| 2247 | if ( 2 > count( $subs ) ) { |
| 2248 | /** This filter is documented in wp-includes/formatting.php */ |
| 2249 | return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' ); |
| 2250 | } |
| 2251 | |
| 2252 | // Create an array that will contain valid subs |
| 2253 | $new_subs = array(); |
| 2254 | |
| 2255 | // Loop through each sub |
| 2256 | foreach ( $subs as $sub ) { |
| 2257 | // Test for leading and trailing hyphens |
| 2258 | $sub = trim( $sub, " \t\n\r\0\x0B-" ); |
| Line | Code |
| 2263 | // If there's anything left, add it to the valid subs |
| 2264 | if ( '' !== $sub ) { |
| 2265 | $new_subs[] = $sub; |
| 2266 | } |
| 2267 | } |
| 2268 | |
| 2269 | // If there aren't 2 or more valid subs |
| 2270 | if ( 2 > count( $new_subs ) ) { |
| 2271 | /** This filter is documented in wp-includes/formatting.php */ |
| 2272 | return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' ); |
| 2273 | } |
| 2274 | |
| 2275 | // Join valid subs into the new domain |
| 2276 | $domain = join( '.', $new_subs ); |
| 2277 | |
| 2278 | // Put the email back together |
| 2279 | $email = $local . '@' . $domain; |
| 2280 | |
| 2281 | // Congratulations your email made it! |
| 2282 | /** This filter is documented in wp-includes/formatting.php */ |
| 2283 | return apply_filters( 'sanitize_email', $email, $email, null ); |
| 2284 | } |
| 2285 | |
| 2286 | /** |
| 2287 | * Determines the difference between two timestamps. |
| 2288 | * |
| 2289 | * The difference is returned in a human readable format such as "1 hour", |
| 2290 | * "5 mins", "2 days". |
| 2291 | * |
| 2292 | * @since 1.5.0 |