9. PHP Tutorial _php operator

PHP Operators

In PHP, the assignment operator = is used to assign a value to a variable.

In PHP, the arithmetic operator + is used to add values together.

PHP arithmetic operators

operator	name	Description	Example	Results
X + y	Add	X and Y's and	2 + 2	4
X-y	Reducing	The difference between x and Y	5-2	3
X * y	By	The product of X and Y	5 * 2	10
X/Y	Except	Quotient of X and Y	15/5	3
X% y	Modulo (remainder of division)	The remainder of x divided by Y	5% 2 10% 8 10% 2	1 2 0
-X	Take counter	X inverse	-2
A. B	collocated	Connect two strings	"Hi". "Ha"	Hiha

The following example shows the different results obtained using different arithmetic operators:

Instance

1<?PHP2 $x=10; 3 $y=6;4 Echo($x+$y);//Output5 Echo($x-$y);//Output 46 Echo($x*$y);//Output7 Echo($x/$y);//Output 1.66666666666678 Echo($x%$y);//Output 49?>

PHP Assignment operators

In PHP, the basic assignment operator is "=". It means that the left operand is set to the value of the right-hand expression. In other words, the value of "$x = 5" is 5.

operator	equivalent to	Description
x = y	x = y	The left operand is set to the value of the right-hand expression
x + = y	x = x + y	Add
X-= y	x = XY	Reducing
X *= y	x = x * y	By
X/= y	× = x/y	Except
X%= y	x = x% y	Modulo (remainder of division)
A. = b	A = A. B	Connect two strings

The following example shows the different results from using different assignment operators:

Instance

1<?PHP2 $x=10; 3 Echo $x;//Output Ten4 5 $y=20; 6 $y+ = 100;7  Echo $y;//Output8 9 $z=50;Ten $z-= 25; One Echo $z;//Output A  - $i=5; - $i*= 6; the Echo $i;//Output -  - $j=10; - $j/= 5; +  Echo $j;//Output 2 -  + $k=15; A $k%= 4; at Echo $k;//Output 3 -?>

The following example shows the different results from using different string operators:

Instance

1<?PHP2 $a= "Hello";3 $b=$a. "World!";4 Echo $b;//Output Hello world!5 6 $x= "Hello";7 $x. = "world!";8 Echo $x;//Output Hello world!9?>

PHP Increment/decrement operator

operator	name	Description
+ + X	Pre-increment	X plus 1, then return x
X + +	Post-increment	return x, then x plus 1
--X	Pre-decrement	X minus 1, then return x
X--	After descending	return x, then x minus 1

The following example shows the results obtained using the increment/decrement operator:

Instance

1<?PHP2 $x=10; 3 Echo++$x;//output one by one4 5 $y=10; 6 Echo $y++;//Output Ten7 8 $z=5;9 Echo--$z;//Output 4Ten  One $i=5; A Echo $i--;//Output 5 -?>

PHP comparison Operators

Comparison operators allow you to compare two values:

operator	name	Description	Example
x = = y	Equals	Returns True if X equals y	5==8 return False
x = = y	Constant equals	Returns True if X equals Y and they are of the same type	5=== "5" returns false
X! = y	Not equal to	Returns True if X is not equal to Y	5!=8 returns True
X <> y	Not equal to	Returns True if X is not equal to Y	5<>8 returns True
X!== y	Not constant equals	Returns True if X is not equal to Y, or if they are of different types	5!== "5" returns True
X > Y	Greater than	Returns True if X is greater than Y	5>8 return False
X < y	Less than	Returns True if X is less than Y	5<8 returns True
X >= y	Greater than or equal	Returns True if X is greater than or equal to Y	5>=8 return False
X <= y	Less than or equal	Returns True if X is less than or equal to Y	5<=8 returns True

The following example shows the different results from using some comparison operators:

Instance

1<?PHP2 $x=100; 3 $y= "100";4 5 Var_dump($x==$y);6  Echo"<br>";7 Var_dump($x===$y);8 Echo"<br>";9 Var_dump($x!=$y);Ten Echo"<br>"; One Var_dump($x!==$y); A Echo"<br>"; -  - $a=50; the $b=90; -  - Var_dump($a>$b); - Echo"<br>"; + Var_dump($a<$b); -?>

PHP logical operators

operator	name	Description	Example
X and Y	And	Returns true if both X and Y are true	X=6 Y=3 (x < ten and y > 1) returns True
X or Y	Or	Returns True if X and Y have at least one true	X=6 Y=3 (x==6 or y==5) returns True
X XOR y	XOR or	Returns True if X and Y have and only one is true	X=6 Y=3 (X==6 xor y==3) returns false
X && y	And	Returns true if both X and Y are true	X=6 Y=3 (x < ten && y > 1) returns True
x | | Y	Or	Returns True if X and Y have at least one true	X=6 Y=3 (x==5 | | y==5) returns false
! X	Non -	Returns True if X is not true	X=6 Y=3 ! (x==y) returns True

PHP Array Operators

operator	name	Description
X + y	Collection	Collections of X and Y
x = = y	Equal	Returns True if X and Y have the same key/value pair
x = = y	Identical	Returns True if X and Y have the same key/value pair and have the same type in the same order
X! = y	Not equal	Returns True if X is not equal to Y
X <> y	Not equal	Returns True if X is not equal to Y
X!== y	Bu Heng, etc.	Returns True if X is not equal to Y

The following example shows the different results from using some array operators:

Instance

1<?PHP2 $x=Array("A" and "Red", "b" = "green")); 3 $y=Array("c" = "Blue", "d" = "Yellow"); 4 $z=$x+$y;//merging $x and $y arrays5 Var_dump($z);6 Var_dump($x==$y);7 Var_dump($x===$y);8  Var_dump($x!=$y);9 Var_dump($x<>$y);Ten Var_dump($x!==$y); One?

9. PHP Tutorial _php operator