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PHP Operators

Submitted by admin on Friday, August 5, 2011 - 22:49.

In every programming language, operators play an important role. It can be use in comparison statements like IF statement, loops statement like WHILE loops, assigning a value to a variable and a lot more.

Comparison Operators

Operator Description Example
>= is greater than or equal to 4>=9 returns false
<= is less than or equal to 5<=7 returns true
<  is less than 2<7 returns true
>  is greater than 3>9 returns false
<>  is not equal 2<>3 returns true
!= is not equal 4!=8 returns true
== is equal to 2==1 returns false

Example of comparison operators in IF statement:

  1. <?php
  2. If (4>=9){
  3. //the statement here will not be executed
  4. }
  5. ?>

Arithmetic Operators

Operator Description Example Result
* Multiplication x=2
x*3		 6
/ Division 9/3
10/2		 3
5
+ Addition x=3
x+4		 7
- Subtraction x=1
5-x		 4
-- Decrement x=4
x--		 x=3
++ Increment x=7
x++		 x=8
% Modulus (division remainder) 5%2
10%8
10%2		 1
2
0

Example of arithmetic operators in mathematics:

  1. <?php
  2. $x = 2;
  3. $y = $x + 3;
  4.  
  5. echo $y;
  6. ?>

Logical Operators

Operator Description Example
&& and x=8
y=2
(x < 10 && y > 1) returns true
! not x=7
y=2
!(x==y) returns true
|| or x=8
y=2
(x==8 || y==2) returns false

Example of logical operators is IF statement:

  1. <?php
  2. $x=8
  3. $y=2
  4.  
  5. If ($x==8 || $y==2){
  6. //the statement here will be executed
  7. }
  8. ?>

Assignment Operators

Operator Example Is The Same As
+= a+=b a=a+b
*= a*=b a=a*b
= a=b a=b
.= a.=b a=a.b
-= a-=b a=a-b
%= a%=b a=a%b
/= a/=b a=a/b

Example of assignment operators in a variable x and y:

  1. <?php
  2. $x = 2;
  3. $y = $x + 3;
  4. ?>
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php tutorial
PHP Operators

Comments

Submitted by Anonymous (not verified) on Mon, 08/22/2011 - 09:53

Hello sir,...can i have a copy of all your tutorials in php? thunderbyte_kivel@yahoo.com tnx..

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