Expressions And Operators: Operator Precedence

The precedence of Hack operators is shown in the table below.

Operators higher in the table have a higher precedence (binding more tightly). Binary operators on the same row are evaluated according to their associativity.

Operator Associativity
\ Left
[] Left
-> ?-> Left
new None
() Left
clone None
await ++ -- (postfix) Right
(int) (float) (string) ** @ ++ -- (prefix) Right
is as ?as Left
! ~ + - (one argument) Right
* / % Left
. + - (two arguments) Left
<< >> Left
< <= > >= <=> None
=== !== == != None
&& Left
^ Left
|| Left
& Left
| Left
?? Right
? : ?: Left
|> Left
= += -= .= *= /= %= <<= >>= &= ^= |= ??= Right
print Right
include require Left
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