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For loop
-----
<?php

// "classical" loop
for ($i = 0; $i < $c; ++$i) {}

// multiple expressions
for (;$a,$b;) {}

// infinite loop
for (;;) {}

// alternative syntax
for (;;):
endfor;
-----
array(
    0: Stmt_For(
        init: array(
            0: Expr_Assign(
                var: Expr_Variable(
                    name: i
                )
                expr: Scalar_LNumber(
                    value: 0
                )
            )
        )
        cond: array(
            0: Expr_Smaller(
                left: Expr_Variable(
                    name: i
                )
                right: Expr_Variable(
                    name: c
                )
            )
        )
        loop: array(
            0: Expr_PreInc(
                var: Expr_Variable(
                    name: i
                )
            )
        )
        stmts: array(
        )
    )
    1: Stmt_For(
        init: array(
        )
        cond: array(
            0: Expr_Variable(
                name: a
            )
            1: Expr_Variable(
                name: b
            )
        )
        loop: array(
        )
        stmts: array(
        )
    )
    2: Stmt_For(
        init: array(
        )
        cond: array(
        )
        loop: array(
        )
        stmts: array(
        )
    )
    3: Stmt_For(
        init: array(
        )
        cond: array(
        )
        loop: array(
        )
        stmts: array(
        )
    )
)

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