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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 |
|---|---|
| 5825 | * Filters whether to preempt the XML-RPC media upload. |
| 5826 | * |
| 5827 | * Passing a truthy value will effectively short-circuit the media upload, |
| 5828 | * returning that value as a 500 error instead. |
| 5829 | * |
| 5830 | * @since 2.1.0 |
| 5831 | * |
| 5832 | * @param bool $error Whether to pre-empt the media upload. Default false. |
| 5833 | */ |
| 5834 | if ( $upload_err = apply_filters( 'pre_upload_error', false ) ) { |
| 5835 | return new IXR_Error( 500, $upload_err ); |
| 5836 | } |
| 5837 | |
| 5838 | $upload = wp_upload_bits($name, null, $bits); |
| 5839 | if ( ! empty($upload['error']) ) { |
| 5840 | /* translators: 1: file name, 2: error message */ |
| 5841 | $errorString = sprintf( __( 'Could not write file %1$s (%2$s).' ), $name, $upload['error'] ); |
| 5842 | return new IXR_Error( 500, $errorString ); |
| 5843 | } |