What 8 data types does php support?

PHP supports 8 basic data types.

Four scalar types:

boolean (Boolean): This is the simplest type, with only two values, which can be TRUE/true or FALSE/false, case-insensitive. For details, please see: PHP Boolean type (boolean)

integer (integer): Its valid range in 32-bit operating systems is: -2 147 483 648~ 2 147 483 647. Integer values ​​can be expressed in decimal, hexadecimal or octal notation and may be preceded by an optional sign (- or ). Octal represents a number that must be preceded by 0 (zero), and hexadecimal represents a number that must be preceded by 0x. For details, please see: PHP integer data (Integer)

float (floating point type, also called double): the valid range in 32-bit operating systems is: 1.7E-308~1.7E 308. For details, please see: PHP floating point type (float)

string (string): Character variables are different from other programming languages ​​in that they are divided into characters and strings. In PHP, character variables are uniformly defined. character or string. For details, please see: PHP string type (string)

Two composite types:

array (array): Array variable is a special variable type , will be explained in detail in subsequent chapters.

object (object): Object is also a special data type. To create an object variable, use the new keyword. For details, please see: PHP object type (object)

Finally, there are two special types:

resource (resource): The source is a special variable that is saved to A reference to an external resource. Resources are created and used through specialized functions. For details, please see: PHP resource type (resource)

NULL (empty): Indicates that a variable has no value. The only possible value of type NULL is NULL.

Note:

You may also read some references to the "double" type. In fact, double and float are the same, and for some historical reasons, these two names existed at the same time.

The type of a variable is usually not set by the programmer, but is determined by PHP at runtime based on the context in which the variable is used. In other words, PHP is a weakly typed language. Programmers do not need to declare the variable type when declaring variables, and the PHP interpreter will automatically recognize it.

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