使用PHP执行多个系统命令

Question

I'm working with SageMath and I am trying to use it in php with exec() or system(). They dont except multiple commands is what I understood from other questions on this but how would I be able to execute:

 sage
 sage: m = matrix(ZZ,2, range(4))
 sage: m[0,0] = m[0,0] - 3
 sage: m

so it can return the solution:

 [-3  1]
 [ 2  3]