Assignment Operators in PHP

Assignment Operators in PHP

There are a few other Operators that tend to do some arithmetic operations
and store the result in same. for eg the addition-assignment operator, represented
by the symbol +=, lets you simultaneously add and assign a new value to a variable.

Common Assignment Operators

Operatos	Description
+=	Add and assign
-=	Subtract and assign
*=	Multiply and assign
/=	Divide and assign quotient
%=	Divide and assign modulus
.=	Concatenate and assign(its used only for sting)

and here’s example illustrating these operators in action.

Add and assign

<?php $x = 500; $x+= 500; echo "sum=".$x."<br/>"; ?>

1 2 3 4 5 6

<?php $x = 500; $x+= 500; echo "sum=".$x."<br/>"; ?>

Output
sum=1000

In the above example
Initialize variable ($x) with value = 500. If we want to add 500 to this value . we don’t need a second and third variable to store the sum of value($x+=500) it means ($x=$x+500 ) .
add 500 and re-assign new value(1000) back to same variable ($x).

---

Subtract and assign

<?php $x = 1000; $x-= 500; echo "subtraction = ".$x."<br/>"; ?>

1 2 3 4 5 6

<?php $x = 1000; $x-= 500; echo "subtraction = ".$x."<br/>";    ?>

Output
subtraction = 500

In the above example
Create and initialize variable($x) hold value = 1000. now perform subtraction. 500 is subtract from 1000 using($x-=500) it means($x=$x – 500 ) .
Now assign new value back to the initialize variable($x). so the output will become:

---

Multiply and assign

<?php $x = 100; $x*= 10; echo "Multiplication = ".$x."<br/>"; ?>

1 2 3 4 5 6

<?php $x = 100; $x*= 10; echo "Multiplication = ".$x."<br/>"; ?>

Output
Multiplication= 1000

In the above example
Variable( $x) with value=100. now perform multiplication. ($x*=10) now value 10 multiply with previous value(100).
and the output will become:1000 and it re-assign back to the variable ($x)
so the output will become : 1000

---

Divide and assign quotient

<?php $x = 1000; $x/= 500; echo "Quotient = ".$x."<br/>"; ?>

1 2 3 4 5 6 7 8

<?php $x = 1000; $x/= 500; echo "Quotient = ".$x."<br/>"; ?>

Output
Quotient = 2

In the above example.
Declare Variable( $x) with value=1000. now perform divide.($x/=500) now value 500 divide with previous value(1000).
and the output will become:2 and it re-assign value=2, back to the variable ($x).

---

Divide and assign modulus

<?php $x = 5; $x%= 2; echo "Remainder = ".$x."<br/>"; ?>

1 2 3 4 5 6

<?php $x = 5; $x%= 2; echo "Remainder = ".$x."<br/>"; ?>

Output
Remainder= 1

In the above example.
Variable($x) with value =5. Now calculate the modulus using ($x%=2) .
it gives remainder value=”1″ and this remainder assign again to variable($x).
and the output will become : 1