请问PHP7新增的标量类型和返回类型声明 性能到底有多大的提升?
请问PHP7新增的标量类型和返回类型声明 性能到底有多大的提升?
回复内容：
性能提升并没有, 相反引入了严格的类型检查, 在正常的情况下反而会加大runtime的开销..这个特性的本意也不是为了性能考虑.
当然, 类型提示会对类型推断起到帮助作用, PHP 7.1中已经加入了"类似"JIT的技术(type specifical opcode handler), 比如 如果类型推断出$a 是int , $b 是int, 那么 $a+$b 就可以使用ZEND_ADD_LONG handler, 从而间接的提高性能.
但是, 总的来说, 这个特性的最初出发点, 并不是为了性能.
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