Improve PHP flat file search script

Our eCommerce software uses flat files to provide search functionality using PHP. See extensive specs in the word document attached. Current Search example: [login to view URL] (Click on + search icon in top right hand corner of browser window to access advanced search.) You also find this website with the search in the attached zip file in the "[login to view URL]" file. If you can not download the zip file, try this link: [login to view URL] To test this upload the website to a server. Also do this to test your solution. ---- The Task ----- The search uses a flat files containing product data and a mapping file to allow scripts to locate data depending on search criteria (see word document). Your task is to make the search more powerful by automatically generating search filters depending on the product details contained in the flat search file and making those accessible to the store by saving them as html and json files. Product information in the flat database file includes price, specials, brand, name, catalogue number, options, specifications, categories and keywords (see specs for full details). The task is to expand the search functionality of the script by scanning the flat search files and by automatically generating additional filters depending on the product details provided in the flat search files and to create a html form which allows customers to use the filters to find products in the store – see specs. The different sections displayed are defined by parameters passed to the search script. The search filter file is generated by a prompt to the script, when the flat files are updated. Support is required for PHP 5-7 Review the Specs and the downloadable shop project with the current PHP search script before quoting. You can upload the website provided on any server. Advanced search is accessed by clicking on the + icon next to the search field in the top right hand corner, once shop is running on a web server. Please provide information as to why you are most suitable for this task. Please do not contact us outside of Freelancer such as via Skype.