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