PHP - Arithmetic Operations

• Addition (+)
  Addition is performed with the "+" symbol.
  Ex:
  $total = 5 + 6;
  Here 5 add to 6 and assign to the total variable 
   
• Subtract (-)
  Subtract is performed with the "-" symbol. 
  Ex:
  $answer = 8 - 6; 
    
• Multiplication (*)
  Multiplication is performed with the "*" symbol. 
  Ex:
  $answer = 5 * 6; 
   
• Division (/)
  Division is performed with the "/" symbol. 
  Ex:
  $answer = 6 / 3; 
   
• Modulus(%)
  Modulus is performed with the "%" symbol. 
  Ex:
  $answer = 6 % 3; 
   
• Increment (++)
  Increment is performed with the "++" symbol. 
  Ex:
  $answer++; 
  This increase answer by 1. 
   echo ++$answer; -> This statement increase 1 before displaying the answer.
   echo $answer++; -> This statement displays the value and then increase the answer by 1
   Ex:
     $ans = 10;.
     echo $ans++; // This displays 10. 
     echo $ans; // This displays 11. 
     echo ++$ans; // This displays 12. 
    
• Decrement (--)
  Decrement is performed with the "--" symbol. 
  Ex:
  $answer--; 
  This decrease answer by 1. 
   echo --$answer; // This statement decrease 1 before displaying the answer.
   echo $answer--; // This statement displays the value and then decrease the answer by 1
   Ex: .
     $ans = 10;.
     echo $ans--; // This displays 10. 
     echo $ans; // This displays 9. 
     echo --$ans; // This displays 8. 
   
• Compound Operations
  $ans += 6 // This executed as $ans = $ans + 6;
  $ans -= 6 // This executed as $ans = $ans - 6;
  $ans /= 6 // This executed as $ans = $ans / 6;
  $ans *= 6 // This executed as $ans = $ans * 6;
  $ans %= 6 // This executed as $ans = $ans % 6;