Data Types for PHP

Brief introduction

PHP supports 8 basic data types

Four types of scalar:

Boolen

Integer

Float (double)

String

Two kinds of composite types:

Array

Object (Objects)

Finally, there are two special types:

Resource (resources)

Null (NULL)

There are other pseudo-types:

Mixed

Number

Callback

and the pseudo-variable $ ...

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

If you just want an easy-to-read type of expression for debugging, use GetType (). To determine a type, do not use GetType () and use the Is_type function.

<?php
    $a _bool =true;//bool
    $a _str1= "foo";//string
     $a _str2= "foo";//string
    $a _int=12;//integer

    Echo GetType ($a _bool)//prints out:boolean//Be careful not to write A_bool, before adding $
    echo GetType ($a _int);//prints out : integer//note Do not write A_bool, the front to add $
    
   /*
     If This is a integer,increment it by four
     */
    if (is_int ($a _int))
 & nbsp;  {
        $a _int+=4;
        echo $a _int;
   }
   //if $a _bool is a string,print it out
    if (is_string ($a _bool))
     {
        echo "String: $a _bool";
   }
?

If you want to cast a variable to a type, you can use a cast or settype () function on it.

Data Types for PHP