Input::prepare()

	protected function prepare() {
		$this->args = wp_parse_args(
			$this->args,
			array(
				'subtype' => 'text',
				'label'   => __( 'AnsPress Input Field', 'anspress-question-answer' ),
			)
		);

		// Remove label if custom html.
		if ( ! empty( $this->args['html'] ) ) {
			unset( $this->args['label'] );
		}

		$this->set_subtype();

		// Call parent prepare().
		parent::prepare();

		$sanitize_subtype = array(
			'number' => 'intval',
			'email'  => 'email',
			'url'    => 'esc_url',
		);

		// Make sure all text field are sanitized.
		if ( in_array( $this->subtype, array_keys( $sanitize_subtype ), true ) ) {
			$this->sanitize_cb = array_merge( array( $sanitize_subtype[ $this->subtype ] ), $this->sanitize_cb );
		} else {
			$this->sanitize_cb = array_merge( array( 'text_field' ), $this->sanitize_cb );
		}

		$validate_subtype = array(
			'number' => 'is_numeric',
			'email'  => 'is_email',
			'url'    => 'is_url',
		);

		if ( in_array( $this->subtype, array_keys( $validate_subtype ), true ) ) {
			$this->validate_cb = array_merge( array( $validate_subtype[ $this->subtype ] ), $this->validate_cb );
		}
	}