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PHP Variables

PHP variable is declared using a $ sign followed by the variable name.

As PHP is a loosely typed language, so you do not need to declare the data types of the variables. PHP automatically converts the variable to its correct data type.

Syntax

$variablename=value;  

The value of a variable is the value of its most recent assignment.

Rules for declaring PHP variable:

  • A variable must start with a dollar ($) sign, followed by the variable name.
  • A variable name must start with a letter or underscore (_) character. It cannot start with a number or special symbols.
  • It can only contain alpha-numeric character and underscore (A-z, 0-9, _).
  • A PHP variable name cannot contain spaces.
  • PHP variables are case-sensitive, so $var and $VAR both are treated as different variable.

PHP Variable Example

<?php  
$str="hello string";  
$x=2893;  
$y=443.6;  
echo "string is: $str <br/>";  
echo "integer is: $x <br/>";  
echo "float is: $y <br/>";  
?>
PHP Variable Example Output