PHP Backend chart generator

Hi, I need a fast PHP chart generator based on json input Charts needs to look like the following: [login to view URL] The chart generation needs to be FAST and work with PHP 7. The chart needs to create a local PNG file with a specified name. Chart should know how to handle up to 24 data points, with a minimum of 1 (1 would be 0 at first point, and then X at the other end). PHP should look like this: $chart = new TrendChart(); $chart->color('green'); $chart->input([1,2,3,4,5,6]); $chart->output('[login to view URL]'); $chart->generate(); Chart should take less than 1 second to generate. We have strong servers, it shouldn't be an issue, so just optimize the code. PLEASE NOTE: This project should not be based on a phantomjs or similar solutions, unless proven to be fully-optimized and extremely fast when creating thousands of charts. We currently have a phantomjs solution, and it takes about 2-3 seconds per chart, with high CPU utilization. We do not wish to have that again. Thanks