PHP Introductory Training tutorial PHP data type

PHP supports eight primitive types (type), the following brother even PHP training

A small series to give you a list:.

Four types of scalar:

String (String)

Integer (integer type)

Float (floating point type, also double)

Boolean (Boolean)

Two kinds of composite types:

Array (arrays)

Object (Objects)

Two special types:

Resource (resources)

Null (empty)

　View variable types

The GetType () function makes it easy to see the type of a variable:

<?php$var_bool = true;//a boolean$var_str = "foo"; a string$var_int = 12; Anintegerecho GetType ($var _bool); Output Booleanechogettype ($var _str); Output Stringecho GetType ($var _int);//Output integer?>

Tips

For historical reasons, if the data is float type, the GetType () function returns a double instead of float.

If you want to see the value and type of an expression, use the Var_dump () function.

　Judging variable types

If you want to determine the next logical action by judging the variable type, do not use GetType () and use the Is_type series function:

<?php$var_int = 12;//If the $var _int is of type int, this is an addition if (Is_int ($var _int)) {$var _int = $var _int+4;} echo $var _int; Output 16?>

PHP Introductory Training tutorial PHP data type