Can we use PHP for machine learning?
PHP becomes faster and faster with every version that comes out and there are libraries such as Rubix ML or PHP-ml which can be used for machine learning and artificial intelligence. The Rubix ML is a machine learning library which is open-source, this means it is free to use.
Which library is used for machine vision?
OpenCV is an open-source library that was developed by Intel in the year 2000. It is mostly used in computer vision tasks such as object detection, face detection, face recognition, image segmentation, etc but also contains a lot of useful functions that you may need in ML.