括号和对象成员的PHP行为

Question

Recently I was working with results from an SQL query call on a mysqli object. I wrote this line of code:

$record = ($result->fetch_object())->acc_id;

and i got Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR) for that line.

Once i changed the code to this:

$record = $result->fetch_object()->acc_id;

it worked as intended.

Why did the parenthesis induce a parse error? I know that in C# the former code would work regardless of them (accounting for the change in syntax)?

Answer 1

As stated by trincot:

Limitation of PHP. You can not use the -> on an evaluated expression