PHP5.6比PHP7的区别
1. PHP7比PHP5性能提升两倍 2. PHP7之前出现的致命错误，都改成了抛出异常 3. PHP7增加了空结合操作符（??）。效果相当于三元运算符 4. PHP7中的函数可以对形参类型声明 5. PHP7后define 现在可以定义常量数组
PHP5.6比PHP7的区别最先出现在Python成神之路。
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