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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 |
|---|---|
| 908 | |
| 909 | // If strict, reduce to ASCII for max portability. |
| 910 | if ( $strict ) |
| 911 | $username = preg_replace( '|[^a-z0-9 _.\-@]|i', '', $username ); |
| 912 | |
| 913 | $username = trim( $username ); |
| 914 | // Consolidate contiguous whitespace |
| 915 | $username = preg_replace( '|\s+|', ' ', $username ); |
| 916 | |
| 917 | return apply_filters( 'sanitize_user', $username, $raw_username, $strict ); |
| 918 | } |
| 919 | |
| 920 | /** |
| 921 | * Sanitizes a string key. |
| 922 | * |
| 923 | * Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes and underscores are allowed. |
| 924 | * |
| 925 | * @since 3.0.0 |
| 926 | * |