src/properties/class-papi-property-flexible.php
protected function render_layout_input( $value ) {
		$slug = sprintf( '%s[%d][%s]', $this->get_slug(), $this->counter, $this->layout_key );
		?>
		<input type="hidden" name="<?php echo esc_attr( $slug ); ?>" value="<?php echo esc_attr( $value ); ?>" />
		<?php
	}
protected function render_layout_input( $value ) {
		$slug = sprintf( '%s[%d][%s]', $this->get_slug(), $this->counter, $this->layout_key );
		?>
		<input type="hidden" name="<?php echo esc_attr( $slug ); ?>" value="<?php echo esc_attr( $value ); ?>" />
		<?php
	}
Render layout input.

@param string $value