While loop
-----
<?php

while ($a) {}

while ($a):
endwhile;
-----
array(
    0: Stmt_While(
        cond: Expr_Variable(
            name: a
        )
        stmts: array(
        )
    )
    1: Stmt_While(
        cond: Expr_Variable(
            name: a
        )
        stmts: array(
        )
    )
)