PHP, Java, SWIFT
PHP: PHP stands for Hypertext Preprocessor and is a server-side programming language. There are many reasons to use PHP for server side programming, firstly it is a free language with no licensing fees so the cost of using it is minimal. PHP can also run on Windows, Linux and Unix servers.
Java: One of the main reasons Java is so popular is its platform independence, which means that Java programs can be run on many different types of computers. A Java program runs on any computer with a Java Runtime Environment, also known as a JRE, installed.
SWIFT: Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, and Linux. Swift is designed to work with Apple's Cocoa and Cocoa Touch frameworks and the large body of existing Objective-C code written for Apple products. Swift is easier to read,to maintain, is safer, is unified with memory management, requires less code, is faster, supports dynamic libraries and has fewer name collisions with open source projects.