PHP Data Type _php Tutorial

PHP data type

PHP supports eight primitive types (type).

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:

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 $var _int is of type int, this is an addition if (Is_int ($var _int)) {$var _int = $var _int+4;} echo $var _int;//output?-->

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