[Quick fix] Debug_Bar_WP_Query::render array to string notice

Or this way:

if ( ! is_scalar( $value ) ) {
	echo '<li>' . $key . ' => <ol><li><xmp>';
	print_r( $value );
	echo '</xmp></li></ol></li>';
}
else {
	echo '<li>' . $key . ' => ' . $value . '</li>';
}

Or more useful, use print_r?

if ( is_object( $value ) ) {
	echo '<li>' . $key . ' => <ol>';
	foreach ( $value as $_key => $_value )
		echo '<li>' . $_key . ' => ' . $_value . '</li>';
	echo '</ol></li>';
} else {
	echo '<li>' . $key . ' => ' . print_r( $value, true ). '</li>';
}

@ben Huson:
I have print_r in my second example, when it’s not a scalar, and surrounded by <xmp> (which is a better version of

)

Sorry, missed that – I was obviously skim reading too fast ??
Use of is_scaler() makes sense.