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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 818 | $filename = str_replace($special_chars, '', $filename); |
| 819 | $filename = preg_replace('/[\s-]+/', '-', $filename); |
| 820 | $filename = trim($filename, '.-_'); |
| 821 | |
| 822 | // Split the filename into a base and extension[s] |
| 823 | $parts = explode('.', $filename); |
| 824 | |
| 825 | // Return if only one extension |
| 826 | if ( count($parts) <= 2 ) |
| 827 | return apply_filters('sanitize_file_name', $filename, $filename_raw); |
| 828 | |
| 829 | // Process multiple extensions |
| 830 | $filename = array_shift($parts); |
| 831 | $extension = array_pop($parts); |
| 832 | $mimes = get_allowed_mime_types(); |
| 833 | |
| 834 | // Loop over any intermediate extensions. Munge them with a trailing underscore if they are a 2 - 5 character |
| 835 | // long alpha string not in the extension whitelist. |
| 836 | foreach ( (array) $parts as $part) { |
| Line | Code |
| 845 | break; |
| 846 | } |
| 847 | } |
| 848 | if ( !$allowed ) |
| 849 | $filename .= '_'; |
| 850 | } |
| 851 | } |
| 852 | $filename .= '.' . $extension; |
| 853 | |
| 854 | return apply_filters('sanitize_file_name', $filename, $filename_raw); |
| 855 | } |
| 856 | |
| 857 | /** |
| 858 | * Sanitize username stripping out unsafe characters. |
| 859 | * |
| 860 | * Removes tags, octets, entities, and if strict is enabled, will only keep |
| 861 | * alphanumeric, _, space, ., -, @. After sanitizing, it passes the username, |
| 862 | * raw username (the username in the parameter), and the value of $strict as |
| 863 | * parameters for the 'sanitize_user' filter. |