write code to combine all types of Documents, images, PDF and make single pdf via PHP

Hello, We have multiple documents collected such as word, excel, images in JPEG, PNG etc formats, PDF documents collected via web form in PHP codeigniter. We are able to combine images to pdf but not able to combine word, pdf formats along and create single pdf. Need expert freelancer who can write code to combine these multiple formats and create a single PDF as required by us. Please quote only if you can do this job using PHP and have done earlier. If you need any further clarifications please ping on chat.