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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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