Variables / Definition  

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Type casting
Array to object
New object

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1) A variable can contain only one type of data

2) Php variables are case sensitive

3) Php variables are strongly typed

PHP is loosely typed, meaning that it will implicitly change the type of a variable as needed, depending on the operation being performed on its value. This contrasts with strongly typed languages, like C and Java, where variables can only contain one type of data throughout their existence. Must be named using only letters, numbers and underscore. Must start with a letter or an underscore. <php $name = 'valid'; // Valid name $_name = 'valid'; // Valid name $1name = 'invalid'; // Invalid name, starts with a number Are one of only two identifier types in PHP that are case-sensitive (the other is constants) <?php error_reporting(E_ALL); $Name = "John"; echo $name; // Notice: Undefined variable: name