PHP has both integer and float (decimal) number types. These two types can be classified under the generic title numbers.
Valid numbers can be anything like:   8,   258,   -37,   89.25,   -3.5785,   5.5e2
- Number-type values are never quoted. The numbers added within quotes are strings with numeric values.
PHP supports a maximum integer of around two billion on most platforms (UNIX and Windows). With numbers larger than that, PHP will automatically use a floating-point type.

1. Numbers and Operator

The mathematical operators are specific symbols that performs mathematical calculations.
Operators act on the variables and numbers presented in PHP instructions.

The standard mathematical (Arithmetic) operators


Assignment Operators


The mathematical calculations in PHP, as in arithmetic, are taken into account the operators precedence (the order in which complex calculations are made). If you want to force the execution order, you must group clauses in parentheses. Check the fallowing example:
<?php
$x = 8 + 3 * 5 -2;
echo $x;                  // 21 (first 3*5 [15], then adds 8 and substract 2 )

$x = (8+3) * (5-2);
echo '<br />'. $x;        // 33  (first 8+3  [11], then  5-2 [3], then makes the multiplication  11*3 [33] )
?>

2. PHP mathematical functions

Along with the arithmetic operators you can use PHP mathematical functions for more complex operations.
Here are some examples of functions:

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag defines the clickable areas inside the image map?
<map> <img> <area>
<img src="image.jpg" usemap="#map1">
<map name="map1">
  <area shape="rect" coords="9, 120, 56, 149" href="#">
  <area shape="rect" coords="100, 200, 156, 249" href="#">
</map>
Which CSS property defines what is done if the content in a box is too big for its defined space?
display overflow position
#id {
  overflow: auto;
}
Click on the event which is triggered when the mouse is positioned over an object.
onclick onmouseover onmouseout
document.getElementById("id").onmouseover = function(){
  document.write("Have Good Life");
}
Indicate the PHP variable that contains data added in URL address after the "?" character.
$_SESSION $_GET $_POST
if(isset($_GET["id"])) {
  echo $_GET["id"];
}
Numbers and mathematical 0perators

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