PHP operator detailed

PHP arithmetic operator

operator	name	Example	Results
+	Addition	$x + $y	$x and $y summation
-	Subtraction	$x-$y	The difference between $x and $y
*	Multiplication	$x * $y	The product of $x and $y
/	Division	$x/$y	Quotient of $x and $y
%	Modulus	$x% $y	$x remainder in addition to $y

PHP increment/decrement operator

operator	name	Description
+ + $x	Forward increments	$x add one increment and then return to $x
$x + +	After increment	Returns $x, then $x add an increment
--$x	Before descending	$x decrease and then return to $x
$x--	After descending	Return $x, then $x decrement

PHP assignment operator

The PHP assignment operator is used to write values to variables.

The base assignment operator in PHP is "=". This means that the right assignment expression sets the value for the left-hand operand.

Assigning values	equal to	Description
x = y	x = y	The right expression sets the value for the left operand.
X + y	x = x + y	Add
x = y	x = XY	Reducing
X *= y	x = x * y	By
X/= y	x = x/y	Except
X%= y	x = x% y	Modulus

PHP comparison operator

The PHP comparison operator is used to compare two values (numbers or strings):

operator	name	example	result
=	equals	$x = = $y	Returns True if the $x equals $y.
= =	Strict (exact)	$x = = $y	returns True if $x equals $y and they are of the same type.
!=	is not equal to	$x!= $y	Returns True if $x is not equal to $y.
<>	not equal to	$x <> $y	Returns True if $x is not equal to $y.
!==	not congruent (completely different)	$x!== $y	Returns True if $x is not equal to $y and their types are not the same 。
	greater than	$x > $y	returns True if the $x is greater than $y.
:	greater than	$x < $y	returns True if the $x is less than $y.
>=	greater than or equal to	$x >= $y	Returns True if $x is greater than or equal to $y.

PHP logical Operators

operator	name	Example	Results
and	And	$x and $y	Returns True if both the $x and the $y are true.
Or	Or	$x or $y	Returns true if the $x and $y at least one is true.
Xor	XOR or	$x XOR $y	Returns true if the $x and $y have and only one is true.
&&	And	$x && $y	Returns True if both the $x and the $y are true.
||	Or	$x | | $y	Returns true if the $x and $y at least one is true.
!	Non -	! $x	Returns True if the $x is not true.

The following table lists the operators from high to low in order of precedence. Operators in the same row have the same precedence, at which point their binding direction determines the order of evaluation.

Operator Precedence

Combining Direction	operator	Additional Information
None	clone new	clone  and  new
left	[ /td>	Array ()
Right	+ +--~ (int) (float) (string) (array) (object) (bool) @	type and increment/decrement
no	instanceof	type
right	!	logical Operators
left	*/%	arithmetic operator
left	+-.	arithmetic operators and string operators
left	<< >>	bitwise operator
none	= =!= = =!== <&G t;	comparison operators
left		bitwise operators and references
left	^	bitwise operators
left	|