Standard Library

The current standard library exists to implement basic functions, print, require_once, require, include_once, include. in PHPIL, it is enforced that functions that conventionally don't require '(' and ')' such as require etc... must have "function call pattern" i.e

require_once('/path/to/item.php'); // instead of require_once 'path/to/item.php';

The standard library is introduced in https://github.com/hudson1998x/PHPIL/tree/master/Engine/Runtime/Stdlib this directory.

Registering core PHP functions in here is relatively simple: GlobalRuntimeContext is a partial class, allowing for grouping of function declarations, for example, standard dev functions exist here: Engine/Runtime/Stdlib/Stdlib.RequireInclude.cs

FunctionTable["print"] = new PhpFunction()
      {
          Name = "print",
          IsSystem = true,
          ReturnType = PhpValue.Void,
          Action = (params PhpValue[] items) =>
          {
              foreach (var item in items)
              {
                  Stdout.Write(item.ToStringValue());
              }

              return PhpValue.Void;
          },
          IsCompiled = false
      }; 

The PHP standard library is fairly large, so marked this as a good first issue as its a fairly simple endeavour.