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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 |
|---|---|
| 1853 | do_action('xmlrpc_call', 'metaWeblog.newMediaObject'); |
| 1854 | |
| 1855 | set_current_user(0, $user_login); |
| 1856 | if ( !current_user_can('upload_files') ) { |
| 1857 | logIO('O', '(MW) User does not have upload_files capability'); |
| 1858 | $this->error = new IXR_Error(401, __('You are not allowed to upload files to this site.')); |
| 1859 | return $this->error; |
| 1860 | } |
| 1861 | |
| 1862 | if ( $upload_err = apply_filters( "pre_upload_error", false ) ) |
| 1863 | return new IXR_Error(500, $upload_err); |
| 1864 | |
| 1865 | if(!empty($data["overwrite"]) && ($data["overwrite"] == true)) { |
| 1866 | // Get postmeta info on the object. |
| 1867 | $old_file = $wpdb->get_row(" |
| 1868 | SELECT ID |
| 1869 | FROM {$wpdb->posts} |
| 1870 | WHERE post_title = '{$name}' |
| 1871 | AND post_type = 'attachment' |