PHP supported primitive data types

In the PHP language environment that supports raw data type 8.

1, Four scalar types

boolean (boolean, true and false) 

<? PHP
 // declare a boolean variable, use the keyword true or false, case-insensitive 
$ var = true ;
 ?>

integer (integer)

? < PHP
 // declare integer 
$ A = 1234; // Decimal 
$ B = -1234; // negative 
$ C = 0123; // octal (equivalent to decimal 83), preceded by a 0 (zero) as the identification. 
D $ = 0x1A; // hexadecimal (equivalent to decimal 26), with the front 0x identified. 
?>

float (float, also called double)

<? PHP
 // declare float 
$ A = 1.234 ; 
 $ b = 1.2e3 ; 
 $ c = 7E-10 ;
 ?>

 

string (string)

<? PHP
 // declare string 
$ str = "PHP the Hello"; // double quotes if there are variables are parsed 
$ b = 'PHP the Hello' ; 
 ?>

2 two match types

Array (array)

 <? PHP
 // declare an array format, which accepts any number of comma-separated key (key) => value (value) for 
$ Array = Array (
 "the Hello" => "world", 
"world" = > "the Hello", 
); 

// since PHP 5.4 from 
$ Array = [
 "the Hello" => "world", 
"world" => "the Hello", 
];
 ?>

 

object (the object)

<? PHP
 // create an object 
class C 
{ 
function do_c () 
{ 
echo "Hello World" ; 
} 
} 

$ cInstance = new new C;
 // reference method 
$ cInstance -> do_c ();
 >?

 

3, a special type

resource (resources)

<? PHP
 // resource resource is a special variable, holding a reference to an external resource. Resources are created and used by special functions. 
?>

 

NULL (no type)

<? PHP
 / * 
the following variables are considered NULL 
is assigned the value NULL 
has not yet been assigned 
to be unset () 
NULL type has only one value is not case-sensitive constant NULL 
* / 
$ var = NULL ; 
 ?>

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