def content_tag(name, *options, &proc)
	content = options.shift unless options.first.is_a?(Hash)
	content ||= nil
	options = options.shift
	if block_given?
		concat("<#{name}#{tag_options(options.stringify_keys) if options}>", proc.binding)
		yield(content)
		concat("</#{name}>", proc.binding)
	elsif content.nil?
		"<#{name}#{tag_options(options.stringify_keys) if options} />"
	else
		super(name, content, options)
	end
end

content_tag (modified): Part 1 (app helper)

rails

Ruby