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php中OR与|| AND与&&的区别总结

WBOY
WBOYOriginal
2016-06-13 09:31:26913browse

本身没有区别,习惯问题 ,但是有时候牵涉到运算符优先级的问题,结果会不同,记录下。
例如:

复制代码 代码如下:


$p = 6 or 0;
var_dump($p);//int(6)

$p = 6 || 0;
var_dump($p);//bool(true)

$p = 6 and 0;
var_dump($p); //int(6) 

$p = 6 && 0;
var_dump($p); //bool(false) 


因为赋值运算的优先级比AND和OR的高,所以先赋值;比&&和||的低,所以逻辑运算符先执行,先逻辑运算,再赋值。

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