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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 |
|---|---|
| 456 | $username = preg_replace('/&.+?;/', '', $username); // Kill entities |
| 457 | |
| 458 | // If strict, reduce to ASCII for max portability. |
| 459 | if ( $strict ) |
| 460 | $username = preg_replace('|[^a-z0-9 _.\-@]|i', '', $username); |
| 461 | |
| 462 | // Consolidate contiguous whitespace |
| 463 | $username = preg_replace('|\s+|', ' ', $username); |
| 464 | |
| 465 | return apply_filters('sanitize_user', $username, $raw_username, $strict); |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * Sanitizes title or use fallback title. |
| 470 | * |
| 471 | * Specifically, HTML and PHP tags are stripped. Further actions can be added |
| 472 | * via the plugin API. If $title is empty and $fallback_title is set, the latter |
| 473 | * will be used. |
| 474 | * |