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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 |
|---|---|
| 997 | * @param mixed $output Form output to return instead. Default empty. |
| 998 | * @param string $form_post URL to POST the form to. |
| 999 | * @param string $type Chosen type of filesystem. |
| 1000 | * @param bool $error Whether the current request has failed to connect. |
| 1001 | * Default false. |
| 1002 | * @param string $context Full path to the directory that is tested for |
| 1003 | * being writable. |
| 1004 | * @param array $extra_fields Extra POST fields. |
| 1005 | */ |
| 1006 | $req_cred = apply_filters( 'request_filesystem_credentials', '', $form_post, $type, $error, $context, $extra_fields ); |
| 1007 | if ( '' !== $req_cred ) |
| 1008 | return $req_cred; |
| 1009 | |
| 1010 | if ( empty($type) ) |
| 1011 | $type = get_filesystem_method(array(), $context); |
| 1012 | |
| 1013 | if ( 'direct' == $type ) |
| 1014 | return true; |
| 1015 | |