$age = 21; $name = "Sam";
Variables are defined by assigning values to them.
Here we are defining two variables name and age.
Variable names are:
- Case sensitive
- Should be prefixed with
- Can contain letters, digits or
- Cannot start with a digit
$booleanVar = true; $integerVar = 12; $floatingPointVar = 1.618; $stringVar = "Hello"; $arrayVar = [1, 2, 3]; $objectVar = (object)["name"=>"Sam", "age"=>21]; $nullVar = null; $resourceVar = fopen("index.php",'r');
PHP Variables can be categorized in three groups:
These are the most basic datatypes, which are: Boolean, Integer, Floating point and String types.
These are data types composed of other datatypes, which are Arrays and Objects.
These are the types that are not Scalar or Compound. Null and Resource are in this category.
$status = 0; $status = "success";
PHP unlike C and Java, is not a Type-Safe Language.
It automatically converts the variable to the correct data type, depending on its value.
$age = 21; // defines $age with value 21 $age = 22; // assign new value 22 to $age
Here, we are defining a variable age with value 21, then on the next statement, it assigns a value 22 to it.