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                            String、Integer、Float、Boolean、Array、Object、Null、Resource；
## 一、String
注意，php字符串相連接，**使用.而不是加號+：**
```
'hello'.'world';
```
>[danger] 
> 1、兩個字符串使用加號的結果是返回0，即false；
> 2、單、雙引號里面包裹的內容都是字符串類型，但是單引號內的內容只可能是字符串，而雙引號內的內容如果是變量則可以被正常解析出來：
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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