Logical operator in php

The standard logical operators and, or, not, and xor are supported by PHP. Logical operators first convert their operands to boolean values and then perform the respective comparison.
What is Operator? Simple answer can be given using expression 4 + 5 is equal to 9. Here 4 and 5 are called operands and + is called operator. PHP language supports following type of operators.

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

Arithmetic Operators
There are following arithmetic operators supported by PHP language −

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

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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
Comparison Operators
There are following comparison operators supported by PHP language

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

Show Examples

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.
greaterthen Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. (A greater B) is not true.
lessthen Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. (A lessthen B) is true.
greater= 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 greater= B) is not true.
less= 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 less= B) is true.
Logical Operators
There are following logical operators supported by PHP language

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

Show Examples

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.

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