A variable in PHP is a name of memory location that holds data. A variable is a temporary storage that is used to store data temporarily.
In PHP, a variable is declared using $ sign followed by variable name.
Syntax of declaring a variable in PHP is given below:
PHP Variable: Declaring String, Integer and Float
Let's see the example to store string, integer and float values in PHP variables.
<?php $str="hello string"; $x=200; $y=44.6; echo "string is: $str <br/>"; echo "integer is: $x <br/>"; echo "float is: $y <br/>"; ?>
PHP Variable: Case Sensitive
In PHP, variable names are case sensitive. So variable name "color" is different from Color, COLOR, COLor etc.
<?php $color="red"; echo "My car is " . $color . "<br>"; echo "My house is " . $COLOR . "<br>"; echo "My boat is " . $coLOR . "<br>"; ?>
My car is red
Notice: Undefined variable: COLOR in C:\wamp\www\variable.php on line 4
My house is
Notice: Undefined variable: coLOR in C:\wamp\www\variable.php on line 5
My boat is
PHP: Loosely Typed Language
PHP is a loosely typed language, it means PHP automatically converts the variable to its correct data type.