PHP – Operator Types

PHP – Operator Types,What is Operator? Simple solution can be given the usage of expression 4 + 5 is equal to nine. Here 4 and five are referred to as operands and + is known as operator. PHP language helps following sort of operators.

  • Arithmetic Operators
  • Comparison Operators
  • Logical (or Relational) Operators
  • Assignment Operators
  • Conditional (or ternary) Operators

Lets have a look on all operators separately.

PHP – Operator Types,Arithmetic Operators

There are following mathematics operators supported by means of PHP language −

Assume variable A holds 10 and variable B holds 20 then −

Operator Description Example
+ Adds two operands A + B will give 30
– Subtracts second operand from the first A – B will give -10
* Multiply both operands A * B will give 200
/ Divide numerator by de-numerator B / A will give 2
% Modulus Operator and remainder of after an integer division B % A will give 0
++ Increment operator, increases integer value by one A++ will give 11
— Decrement operator, decreases integer value by one A– will give 9

PHP – Operator Types,Comparison Operators

There are following comparison operators supported by means of PHP language

Assume variable A holds 10 and variable B holds 20 then −

Operator Description Example
== Checks if the value of two operands are equal or not, if yes then condition becomes true. (A == B) is not true.
!= Checks if the value of two operands are equal or not, if values are not equal then condition becomes true. (A != B) is true.
> Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. (A > B) is not true.
< Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. (A < B) is true.
>= Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. (A >= B) is not true.
<= Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. (A <= B) is true.

PHP – Operator Types,Logical Operators

There are following logical operators supported by means of PHP language

Assume variable A holds 10 and variable B holds 20 then −

Operator Description Example
and Called Logical AND operator. If both the operands are true then condition becomes true. (A and B) is true.
or Called Logical OR Operator. If any of the two operands are non zero then condition becomes true. (A or B) is true.
&& Called Logical AND operator. If both the operands are non zero then condition becomes true. (A && B) is true.
|| Called Logical OR Operator. If any of the two operands are non zero then condition becomes true. (A || B) is true.
! Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false. !(A && B) is false.

Assignment Operators

There are following assignment operators supported by PHP language −

Operator Description Example
= Simple assignment operator, Assigns values from right side operands to left side operand C = A + B will assign value of A + B into C
+= Add AND assignment operator, It adds right operand to the left operand and assign the result to left operand C += A is equivalent to C = C + A
-= Subtract AND assignment operator, It subtracts right operand from the left operand and assign the result to left operand C -= A is equivalent to C = C – A
*= Multiply AND assignment operator, It multiplies right operand with the left operand and assign the result to left operand C *= A is equivalent to C = C * A
/= Divide AND assignment operator, It divides left operand with the right operand and assign the result to left operand C /= A is equivalent to C = C / A
%= Modulus AND assignment operator, It takes modulus using two operands and assign the result to left operand C %= A is equivalent to C = C % A

Conditional Operator

There is one greater operator referred to as conditional operator. This first evaluates an expression for a true or fake fee after which execute one of the two given statements relying upon the result of the evaluation. The conditional operator has this syntax −

Operator Description Example
? : Conditional Expression If Condition is true ? Then value X : Otherwise value Y

Operators Categories

All the operators we’ve got discussed above can be labeled into following categories −

  • Unary prefix operators, which precede a unmarried operand.
  • Binary operators, which take two operands and perform a diffusion of arithmetic and logical operations.
  • The conditional operator (a ternary operator), which takes 3 operands and evaluates both the second one or 1/3 expression, relying on the evaluation of the first expression.
  • Assignment operators, which assign a value to a variable.

Precedence of PHP Operators

Operator precedence determines the grouping of terms in an expression. This influences how an expression is evaluated. Certain operators have higher precedence than others; for instance, the multiplication operator has better precedence than the addition operator −

For example x = 7 + three * 2; Here x is assigned 13, now not 20 because operator * has better priority than + so it first get multiplied with three*2 and then provides into 7.

Here operators with the highest priority seem on the pinnacle of the table, people with the bottom seem at the lowest. Within an expression, better precedence operators may be evaluated first.

Category Operator Associativity
Unary ! ++ — Right to left
Multiplicative * / % Left to right
Additive + – Left to right
Relational < <= > >= Left to right
Equality == != Left to right
Logical AND && Left to right
Logical OR || Left to right
Conditional ?: Right to left
Assignment = += -= *= /= %= Right to left