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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 |
|---|---|
| 310 | $username = strip_tags($username); |
| 311 | // Kill octets |
| 312 | $username = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '', $username); |
| 313 | $username = preg_replace('/&.+?;/', '', $username); // Kill entities |
| 314 | |
| 315 | // If strict, reduce to ASCII for max portability. |
| 316 | if ( $strict ) |
| 317 | $username = preg_replace('|[^a-z0-9 _.\-@]|i', '', $username); |
| 318 | |
| 319 | return apply_filters('sanitize_user', $username, $raw_username, $strict); |
| 320 | } |
| 321 | |
| 322 | function sanitize_title($title, $fallback_title = '') { |
| 323 | $title = strip_tags($title); |
| 324 | $title = apply_filters('sanitize_title', $title); |
| 325 | |
| 326 | if (empty($title)) { |
| 327 | $title = $fallback_title; |
| 328 | } |