Operators in PHP

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In this tutorial, we will lean Operators in PHP. Operators are special symbols which tell to PHP processor to do some special operations. For example, There is + operator which tells PHP Processor to add two numbers (4+5). There are various operators available in PHP and they are divided into some categories. List of Categories:

• Arithmetic Operators
• Comparison Operators
• Assignment Operators
• Inc/Dec Operators
• Logical Operators
• String Operators
• Array Operators

Now we will learn about each category in detail. We will learn which operators are in each category and how do they work.

Arithmetic Operators:

There is a total of five operators in this category. Arithmetic operators are used to performing some basic mathematical operations. Operators in this category are +,-, /, *, %. Checklist of Arithmetic Operators.

Operator	Name	Description	Example
+	Addition	Add Two Number	10+5
–	Subraction	Subtract second number from first umber	10-5
*	Multiplication	Multiply Two Number	10*5
/	Division	Division of Two Number	10/5
%	Modulus	Return Remainder after Devision	10%5

Comparison Operators: 

Comparisons operators are used to comparing two numbers. For example to check which number is greater from giver number(10>5). Result of comparison operators come in Boolean form mean 10>5 result of this would be true. List of operators in this category is as follow.

Operator	Name	Description	Example
==	Equal	Return true if first value would equal to second	10==10
===	Identical	Return true if both operands would be of same data type	10===10
!=	Not equal	Return true if both values are not same	10!=5
!==	Not identical	Return true if both values would not be of same type.	10!===5
<	Less than	Return true if first value will be less than second	10<20
>	Greater than	Return true if first value will greater than second	10>5
<=	Less than or equal to	Return true if first value will be less than or equal to second	10<=5
>=	Greater than or equal to	Return true if first value will be greater than or equals to second	10>=5

Assignment Operators:

The most common Assignment operator is =. Assignment operators are used to assigning value to variables. There is a total of six assignment operators check this list.

Operator	Name	Description	Example
=	Assign	assign value to variables	$num=10
+=	Add and assign	Assign value to variable after adding value on right hand side in previous value of variable	num+=10 ($num = $num+10)
-=	Subtract and assign	Assign value to variable after subtracting value on right hand side from previous value of variable	$num-=10 ($num=$num-10)
*=	Multiply and assign	Assign value to variable after Multiply value on right hand side with previous value of variable	$num*=10 ($num=$num*10)
/=	Divide and assign quotient	Assign value to variable after dividing previous value of variable with value on right hand	$num/=10 ($num=$num/10)
%=	Divide and assign modulus	Assign remainder to variable after dividing previous value of variable with value on right hand	$num%=10 ($num=$num%10)

Inc/Dec Operators:

Increment and Decrements are unary operators means it only works with the single operand. These operators are used to increase or decrease the value of a variable by one. Both Inc and Dec come in two types pre-increment and post-increment.

Operator	Name	Description	Example
++	Increment	Increment the value of $a by one, then return $a Return $a, then increment the value of $a by one	++$a $a++
—	Decrement	Decrement the value of $a by one, then return $a Return $a, then Decrement the value of $a by one	–$a $a–

Logical Operators:

Logical Operators are used to check logical relation between operands. These operators are used to perform bit level operations.

Operator	Name	Description	Example
and	And	Return TRUE if both $op1 and $op2 are true	$op1 and $op2
Or	Or	Return TRUE if either $op1 or $op2 is true	$op1 or $op2
xor	Xor	Return TRUE if either $op1 or $op2 is true but not both	$op1 xor $op2
!	Not	Return TRUE if $op1 is not true	! $op1
&&	And	Return TRUE if either $op1 and $op2 are true	$op1 && $op2
||	Or	Return TRUE if either $op1 or $op2 is true	$op1 || $op2

String Operators:

String operators are used to perform some special operations with Strings.

Operator	Name	Description	Example
.	Concatenation	Concatenate $str1 with $str2	$str1 . $str2
.=	Concatenation and Assignment	First will concatenate $str1 with $str2, then assign the final concatenated string to $str1,	$str1 .= $str2

Array Operators:

Array operators are used to perform special operations with Arrays.

Operator	Name	Description	Example
+	Union	Union of $num1 and $num2	$num1 + $num2
==	Equality	Return TRUE if $num1 and $num2 have same key/value pair	$num1 == $num2
!=	Inequality	Return TRUE if $num1 is not equal to $num2	$num1 != $num2
===	Identity	Return TRUE if $num1 and $num2 have same key/value pair of the same type in the same order	$num1 === $num2
!==	Non-Identity	Return TRUE if $num1 is not identical to $num2	$num1 !== $num2
<>	Inequality	Return TRUE if $num1 is not equal to $num2	$a <> $b

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