Operator Concept in PHP

It is used to perform operations using operand, Operand can be variable, constant, and literals.
literal means value of variable or constant. for example, 1 is literals, "hello" is String literals.
Type of Operator:-
1) Unary:-    This operator will work using a single operand.
1.1 Increment:-      $a++    increase by one
1.1.1  Post increment:-   first complete other operation then increase value.
          $a++;
         Example of Post Increment:-
         <?php
             $a=2;
            $b=$a++;  //b=2,a=3
            echo $a,"<br>",$b;
          ?>
   1.1.2  Pre Increment:-     first increase then perform other operations.
         ++$a;
1.2  Decrement:-   $a--      decrease by one
Example of Increment, Decrement:-
<?php
$a=5;
$a++;
echo $a,"<br>";
$a--;
echo $a;
?>

Another Example of Increment, Decrement:-

<?php

$a=5;

$b=5;

$a++;  

++$b;

echo $a++ ," ", ++$b,"<br>";

?>

2) Binary:-   It will use minimum two operand to perform operation .
2.1) Arithmetic :-  +,-,*,/, %
2.2)  Conditional or Relational :-   <, >,  <=,  >=    (it will use in if--else or loop)
2.3)  Comparison  :-
         ==      it will compare only data, datatype can be different
         if(2=="2")   //true
            ===   it will compare data and datatype both
       if(2==="2")   //false
2.4)  Logical Operator:-
       &&       it will return when all condition will be true
       ||            it will return when the particular condition will be true
      !             it is the opposite of true condition and returns a false value.
2.5) Assignment operator:-
2.5.1)   Simple Assignment    =    ($a=2 )
2.5.2)   Complex Assignment      $a=$a+5  ,  $a+=5
                                                      $a=$a*3,   $a*=3

                                                     $a=$a/4       $a/=4
<?php
$a=5;      //5
$a=$a+2;   //7
echo $a;
$a=$a*2;   //14
echo $a;
$a=$a%2;  
echo $a;  //0
?> 

3) Ternary:-
It is used to solve the condition-based problems using a ternary statement. ternary provide a single-line statement to implement code.
var = (condition)?true:false;
WAP to check even numbers or odd numbers?

<?php

$num=4;

echo $num%2==0?"even":"odd";

?>

<?php

$num=4;

$x=$num%2==0?"even":"odd";

echo $x;

?>

Assignment:-
WAP to calculate electricity bill where unit price and total consumption will be assigned by the user?
WAP to reverse the five-digit number?
12345   res  54321

<?php

$num = 78912;

$a = $num%10;  //5

$num = (int)($num/10); //1234.5

$b = $num%10;  //4

$num = (int)($num/10);  //123

$c = $num%10; //3

$num = (int)($num/10);  //12

$d = $num%10;  //2

$e = (int)($num/10);  //1

$rev = $a*10000+$b*1000+$c*100+$d*10+$e*1;

print($rev);

?>

 WAP to perform the addition of complex numbers?
2+3i
4+5i
.................
6+8i

<?php

$r1=2;

$i1=4;

$r2=7;

$i2=5;

$r = $r1+$r2;

$i = $i1+$i2;

echo $r1."+".$i1."i"."<br>";

echo $r2."+".$i2."i"."<br>";

echo $r."+".$i."i";

?>

Another Solution:-

<?php

$r1=2;

$i1=4;

$r2=7;

$i2=5;

$r = $r1+$r2;

$i = $i1+$i2;

echo "$r1 + $i1 i <br>";

echo "$r2 + $i2 i <br>";

echo "$r + $i i <br>";

?>

WAP to calculate the salary of the employee where basic, ta, da, comm, pf,hra, and leave will be assigned by the users?