Variables in PHP

Variables in PHP are used to store information, such as strings, numbers, arrays, and objects. Variables are declared with a dollar sign ($) followed by the variable name and are assigned a value with the assignment operator (=).

For example:

$name = "John";

In this example, the variable $name is declared and assigned the string value “John”.

Variables can also be used to store the results of calculations, such as the sum of two numbers:

$x = 5;
$y = 10;
$sum = $x + $y;

In this example, the variables $x and $y are declared and assigned the integer values 5 and 10, respectively. The variable $sum is then declared and assigned the value of $x + $y, which is 15.

Variables can also be used to store the result of a function call, such as the result of a strlen() function, which returns the length of a string:

$name = "John";
$length = strlen($name);

In this example, the variable $name is declared and assigned the string value “John”, and the variable $length is declared and assigned the value returned by the strlen() function, which is 4.