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What are the php data types?

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Sep 27, 2019 pm 04:08 PM

type of data

What are the php data types?

The data types in PHP include the following

标量类型：boolean(布尔型)， integer (整型)，float (浮点型，也成作 double )， string (字符串);
复合类型：array (数组)， object (对象);
特殊类型： resource (资源)，NULL (无类型)；

2. Let’s talk about the characteristics of Boolean types, integers and floating point types and the precautions in daily development. :

Boolean type

1、这是最简单的类型。boolean 表达了真值，可以为 TRUE 或 FALSE;
2、要指定一个布尔值，使用常量 TRUE 或者 FALSE , 两个都不区分大小写；
3、通常运算符所返回的 boolean 值结果会被传递给 控制流程 ;

integer (integer):

整型可以是十进制，十六进制，八进制，二进制标识，前面可以加上可选符号( +,  -);
要使用八进制，数字前面必须加上 0(零)， 要使用十六进制表达，数字前面必须加上 0x; 要使用二进制表达，数字前面必须加上 0b;

float floating point type:

Floating point type (also called floating point type) Point number float, double precision number double or real number real)

将字符串转换成浮点型，和以上字符串转换成整型数值一样，可以参照以上的描述；
如果将一个对象转换为浮点型，会报 E_NOTICE 错误；
浮点数比较：
浮点类型不能用于判断两个数值是否相等 ，因为内部转二进制的时候会有损耗；

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