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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 |
|---|---|
| 320 | $username = strip_tags($username); |
| 321 | // Kill octets |
| 322 | $username = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '', $username); |
| 323 | $username = preg_replace('/&.+?;/', '', $username); // Kill entities |
| 324 | |
| 325 | // If strict, reduce to ASCII for max portability. |
| 326 | if ( $strict ) |
| 327 | $username = preg_replace('|[^a-z0-9 _.\-@]|i', '', $username); |
| 328 | |
| 329 | return apply_filters('sanitize_user', $username, $raw_username, $strict); |
| 330 | } |
| 331 | |
| 332 | function sanitize_title($title, $fallback_title = '') { |
| 333 | $title = strip_tags($title); |
| 334 | $title = apply_filters('sanitize_title', $title); |
| 335 | |
| 336 | if ( '' === $title || false === $title ) |
| 337 | $title = $fallback_title; |
| 338 | |