Loosely 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.
Variables must be named using only
letters, numbers and underscore. Must start with
a letter or an underscore.
$name = 'valid';
$_name = 'valid';
$1name = 'invalid';
Are one of only two identifier types in PHP that are case-sensitive (the other is constants)
$Name = "John";