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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 |
|---|---|
| 865 | $special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}", chr(0)); |
| 866 | /** |
| 867 | * Filter the list of characters to remove from a filename. |
| 868 | * |
| 869 | * @since 2.8.0 |
| 870 | * |
| 871 | * @param array $special_chars Characters to remove. |
| 872 | * @param string $filename_raw Filename as it was passed into sanitize_file_name(). |
| 873 | */ |
| 874 | $special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw ); |
| 875 | $filename = str_replace($special_chars, '', $filename); |
| 876 | $filename = preg_replace('/[\s-]+/', '-', $filename); |
| 877 | $filename = trim($filename, '.-_'); |
| 878 | |
| 879 | // Split the filename into a base and extension[s] |
| 880 | $parts = explode('.', $filename); |
| 881 | |
| 882 | // Return if only one extension |
| 883 | if ( count( $parts ) <= 2 ) { |