Arithmetic Operators

<?php

  /*
    Operators
    - Used To Perform Operations On Values.

    Arithmetic Operators
    - Used To Do Arithmetical Operations &#038; Conversion

    - $a [+]  $b => Addition
    - $a [-]  $b => Subtraction
    - $a [*]  $b => Multiplication
    - $a [/]  $b => Division
    - $a [%]  $b => Modulus
    - $a [**] $b => Exponentiation
    - +$a        => Identity
    - -$a        => Negation
  */

  echo 10 + 20;
  echo '<br>';
  echo gettype(10 + 20);
  echo '<br>';
  echo 9.5 + 20.5;
  echo '<br>';
  echo gettype(9.5 + 20.5);
  echo '<br>';

  echo 10 - 20;
  echo '<br>';
  echo gettype(10 - 20);
  echo '<br>';
  echo 9.5 - 20.5;
  echo '<br>';
  echo gettype(9.5 - 20.5);
  echo '<br>';

  echo 10 * 20;
  echo '<br>';
  echo gettype(10 * 20);
  echo '<br>';
  echo 9.5 * 20.5;
  echo '<br>';
  echo gettype(9.5 * 20.5);
  echo '<br>';

  echo 20 / 10;
  echo '<br>';
  echo gettype(20 / 10);
  echo '<br>';
  echo 20 / 8;
  echo '<br>';
  echo gettype(20 / 8);
  echo '<br>';

  echo 21 % 10; // Remove 1 To Become 20
  echo '<br>';
  echo 23 % 10; // Remove 3 To Become 20
  echo '<br>';
  echo 29 % 10; // Remove 9 To Become 20
  echo '<br>';
  echo 30 % 10;
  echo '<br>';

  echo 2 ** 4;
  echo '<br>';
  echo 2 * 2 * 2 * 2;
  echo '<br>';
  echo 3 ** 5;
  echo '<br>';
  echo 3 * 3 * 3 * 3 * 3;
  echo '<br>';

  echo "100";
  echo '<br>';
  echo gettype("100");
  echo '<br>';
  echo +"100";
  echo '<br>';
  echo gettype(+"100");
  echo '<br>';

  echo "-100";
  echo '<br>';
  echo gettype("-100");
  echo '<br>';
  echo -"-100";
  echo '<br>';
  echo gettype(-"-100");