0 
0 Operator Precedence
You Can force precedence using parentheses otherwise they are evaluated in this order:
XOR – exclusive or-either a or b is true but not both.
AND is not the same like &&
For Example:
<?php
echo $a && $b || $c;
?>
is not the same like
<?php
echo $a AND $b || $c;
?>
the first thing is
(a and b) or c
the second
a and (b or c)
because || has got a higher priority than and, but less than &&
Operators:
Operator are used to perform operation.
Operator are mainly divided by three groups.
- Unary Operators that takes one values
- Binary Operators that takes two values
- Ternary operators that takes three values
Operator are mainly divided by three groups that are totally seventeen types.
1. Arithmetic Operator
+ Addition
– Subtraction
* Multiplication
/ Division
% Modulo
** Exponentiation
2. Assignment Operator
= equal
3. Array Operator
+ Union
== Equality
=== Identity
!= Inequality
<> Inequality
!== Non-identity
4. Bit-wise Operator
& and
^ xor
| not
5. Comparison Operator
== equal to
=== identical
!= not equal
!== not identical
<> not equal
< less than
<= less than or equal
> greater than
>= greater than or equal
<=> spaceship operator
6. Execution Operator
“ back-ticks
7. Execution Operator
@ at the rate sign
8. Incrementing/Decrementing Operator
++$a Pre-Increment
$a++ Post-Increment
– -$a Pre-Decrement
$a- – Post-Decrement
9. Logical Operator
&& And
|| Or
! Not
and And
xor Xor
or Or
10. String Operator
. concatenation operator
.= concatenating assignment operator
11. Type Operator
instanceof instanceof
12. Ternary or Conditional operator
?: Ternary operator
13. Null Coalescing Operator
??” null coalescing
14. Clone new Operator
clone new clone new
15. yield from Operator
yield from yield from
16. yield Operator
yield yield
17. print Operator
print print
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