PHP Operators

The PHP operators can be divided broadly into 5 categories namely,

• Arithmetic Operators
• Assignment Operators
• Comparison Operators
• Logical Operators

Arithmetic Operators

Operator	Description
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Modulus
++	Increment
--	Decrement

Let's see a few examples.

$a = 4;
$b = 2;
$Add= $a + $b;
$Sub= $a - $b;
$Multip= $a * $b;
$Div= $a / $b;
$Mod= $a % $b;
$Increm= $a++;
$Decrem= $b--;

The reult of the above will be:

Add=6
Sub=2
Multip=8
Div=2
Mod=0
Increm=5
Decrem=1

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Assignment Operators

Operator	Description
=	$a = $b; assigns a the value of b (Equal)
+=	$a+=$b; means $a = $a+$b; (Addition)
-=	$a-=$b; means $a = $a-$b; (Subtraction)
*=	$a*=$b; means $a = $a*$b; (Multiplication)
/=	$a/=$b; means $a = $a/$b; (Division)
.=	$a.=$b; means $a = $a.$b; (Concatenation)
%=	$a%=$b; means $a = $a%$b; (Modulus)

Let's take a look at a few examples:

$a = 4;
$b = 2;
1) $a = $b; (assigns a the value 4)
2) $a+=$b; (a will have the value 6)
3) $a-=$b; (a will have the value 2)
4) $a*=$b; (a will have the value 8)
5) $a/=$b; (a will have the value 2)
6) $a%=$b; (a will have the value 0)

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Comparison Operators

Operator	Description
==	$a==$b; will return true if value of a is equal to value of b
!=	$a!=$b; will return true if value of a is not equal to value of b
>	$a>$b; will return true if value of a is greater than value of b
<	$a<$b; will return true if value of a is less than value of b
>=	$a>=$b; will return true if value of a is greater than or equal to value of b
<=	$a<=$b; will return true if value of a is less than or equal to value of b

Below are a few examples:

$a == $b;// test if two values are equal
$a != $b;// test if two values are not equal
$a < $b;// test if the first value is less than the second
$a > $b;// test if the first value is greater than the second
$a <= $b;// test if the first value is less than or equal to the second
$a >= $b;// test if the first value is greater than or equal to the second

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Logical Operators

Operator	Description
&&	and; returns true when two or more conditions are be true
||	or; returns true when either of the two conditions is true
!	not; negates a given condition