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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 |
|---|---|
| 4932 | return $this->error; |
| 4933 | |
| 4934 | do_action('xmlrpc_call', 'metaWeblog.newMediaObject'); |
| 4935 | |
| 4936 | if ( !current_user_can('upload_files') ) { |
| 4937 | $this->error = new IXR_Error( 401, __( 'You do not have permission to upload files.' ) ); |
| 4938 | return $this->error; |
| 4939 | } |
| 4940 | |
| 4941 | if ( $upload_err = apply_filters( 'pre_upload_error', false ) ) |
| 4942 | return new IXR_Error(500, $upload_err); |
| 4943 | |
| 4944 | if ( !empty($data['overwrite']) && ($data['overwrite'] == true) ) { |
| 4945 | // Get postmeta info on the object. |
| 4946 | $old_file = $wpdb->get_row(" |
| 4947 | SELECT ID |
| 4948 | FROM {$wpdb->posts} |
| 4949 | WHERE post_title = '{$name}' |
| 4950 | AND post_type = 'attachment' |