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 is used to include external CSS file in web page?
<body> <script> <link>
<link href="/templ/style.css" rel="stylesheet" type="text/css" />
Which CSS property sets the text size?
font-weight text-decoration font-size
h2 {
  font-size: 1em;
}
Indicate the JavaScript property that can add HTML code into an element.
text value innerHTML
document.getElementById("someID").innerHTML = "HTML content";
Click on the function that returns the number of characters of a string in PHP.
count() strlen() stristr()
$str = "http://CoursesWeb.net/";
$nr_chr = strlen($str);
echo $nr_chr;       // 22
Numbers and mathematical 0perators

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