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                            三大數據類型：
標量：浮點 字符串  布爾 整型
復合：數組 對象
特殊：nulll

浮點：
損耗

布爾：
![](https://img.kancloud.cn/af/5d/af5d3a2295b3398f293d56eda18d91c0_472x52.png)


字符串
![](https://img.kancloud.cn/e4/d9/e4d9a296609eb51375aff2f966827882_704x230.png)![](https://img.kancloud.cn/b6/fb/b6fbb75126428f42b77d030fdde17395_664x264.png)
單引號效率更高
雙引號里面有單引號 ， 單引號包含變量的，是可以解析的
![](https://img.kancloud.cn/19/3a/193a5f14e83ba67720a0368ef221c711_433x63.png)
![](https://img.kancloud.cn/64/84/64843828ed4c79ae924e00a2497b0941_334x154.png)


數組：
 
超全局數組
![](https://img.kancloud.cn/6d/69/6d69dd423a0f849cce40faef1526c7e6_680x74.png)
$_request 不安全
$_server 典型值

NUll:
![](https://img.kancloud.cn/3d/39/3d3912eeebfc333030049504770e4b91_586x82.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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