while循环和for循环的区别？

Answer 1

What is the difference between while loop and for loop? -PHP Chinese website Q&A-What is the difference between while loop and for loop? -PHP Chinese website Q&A

Please watch and learn.

Answer 2

for循环的变量可以声明在循环体里 ，适用于循环体已知的循环

while要在循环体外声明一个全局变量用于判断，适用于循环体未知的循环