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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 |
|---|---|
| 331 | // If strict, reduce to ASCII for max portability. |
| 332 | if ( $strict ) |
| 333 | $username = preg_replace('|[^a-z0-9 _.\-@]|i', '', $username); |
| 334 | |
| 335 | return apply_filters('sanitize_user', $username, $raw_username, $strict); |
| 336 | } |
| 337 | |
| 338 | function sanitize_title($title, $fallback_title = '') { |
| 339 | $title = strip_tags($title); |
| 340 | $title = apply_filters('sanitize_title', $title); |
| 341 | |
| 342 | if ( '' === $title || false === $title ) |
| 343 | $title = $fallback_title; |
| 344 | |
| 345 | return $title; |
| 346 | } |
| 347 | |
| 348 | function sanitize_title_with_dashes($title) { |
| 349 | $title = strip_tags($title); |