Oke, but && has a higher precedence. The "right " associativity has sense when all the operand has the same precedence.
I think the precedence of left and right associative operands can't be compared. The switch between associativities already separates the expression (if it could be explained this way). So you have to handle "left-evaluated" expressions and "right-evaluated" expressions separately. That's why "$b = 0" and "1 && $b" are evaluated separately.
The PHP manual gives a fine example: "Note: Although ! has a higher precedence than =, PHP will still allow expressions similar to the following: if (!$a = foo()), in which case the output from foo() is put into $a."
And that's because "=" is "right" and "!" is "non-associative".
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