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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 |
---|---|
5804 | * Filter whether to preempt the XML-RPC media upload. |
5805 | * |
5806 | * Passing a truthy value will effectively short-circuit the media upload, |
5807 | * returning that value as a 500 error instead. |
5808 | * |
5809 | * @since 2.1.0 |
5810 | * |
5811 | * @param bool $error Whether to pre-empt the media upload. Default false. |
5812 | */ |
5813 | if ( $upload_err = apply_filters( 'pre_upload_error', false ) ) { |
5814 | return new IXR_Error( 500, $upload_err ); |
5815 | } |
5816 |
|
5817 | $upload = wp_upload_bits($name, null, $bits); |
5818 | if ( ! empty($upload['error']) ) { |
5819 | $errorString = sprintf(__('Could not write file %1$s (%2$s)'), $name, $upload['error']); |
5820 | return new IXR_Error(500, $errorString); |
5821 | } |
5822 | // Construct the attachment array |