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Add the “input hidden” field type to Easy Digital Download settings

This snippet adds a hidden field type to the input fields that are available when setting up Easy Digital Download's settings.

function edd_hidden_callback( $args ) {
	global $edd_options;
	if ( isset( $edd_options[ $args['id'] ] ) )
		$value = $edd_options[ $args['id'] ];
	else
		$value = isset( $args['std'] ) ? $args['std'] : '';
	$size = ( isset( $args['size'] ) && ! is_null( $args['size'] ) ) ? $args['size'] : 'regular';
	$html = '<input type="hidden" class="' . $size . '-text" id="edd_settings[' . $args['id'] . ']" name="edd_settings[' . $args['id'] . ']" value="' . esc_attr( stripslashes( $value ) ) . '"/>';
	echo $html;
}

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