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Tutorials » Php »
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Topic |
What is Operator Precedence?
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Explanation |
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The precedence of an operator is important to bind two expressions together.
For example, in the expression 1 + 5 * 3, the answer is 16 and not 18 because the
"*" operator has a higher precedence than the "+" operator.
Parentheses may be used to force precedence, if necessary. For instance: (1 + 5) * 3
evaluates to 18. If operator precedence is equal, left to right associativity is used.
The following table lists the precedence of operators with the highest-precedence
operators listed at the top of the table.
| Associativity |
Operators |
Additional Information |
| non-associative |
clone new |
clone and new |
| left |
[ |
array() |
| non-associative |
++ -- |
increment/decrement |
| non-associative |
~ - (int) (float) (string) (array) (object) (bool) @ |
types |
| non-associative |
instanceof |
types |
| right |
! |
Logical |
| left |
* / % |
arithmetic |
| left |
+ - . |
arithmetic and string |
| left |
<< >> |
bitwise |
| non-associative |
< <= > >= <> |
comparison |
| non-associative |
== != === !== |
comparison |
| left |
& |
bitwise and references |
| left |
|
bitwise |
| left |
| |
bitwise |
| left |
&& |
logical |
| left |
|| |
logical |
| left |
? : |
ternary |
| right |
= += -= *= /= .= %= &= |=
= <<= >>= |
assignment |
| left |
and |
logical |
| left |
xor |
logical |
| left |
or |
logical |
| left |
, |
many uses |
Left associativity means that the expression is evaluated from left to right, right associativity means from right to left.
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A Note |
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