在php7中,千万不要把你的??当成三元运算符使用!!!
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php7新增一个运算符
??，不知道大家平时是在什么时候用它，但是我一直用它代替以前的三元运算符? ：，今天偶然发现，它和三元运算符是不一样的,.在想用
??判断一个赋值为0的变量的时候要小心了，结果可能和想象中的不一样从上面的结果可以看出,在php7中 ?? 代表isset ?: 代表empty
今天想告诉大家在php7中关于这个几个最常用的内置函数而可能会引发的问题，需要注意一下啊!!!
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