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What are the php data types?

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2019-09-27 16:08:325517browse

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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