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分支与循环// 单分支$age = 19;if($age >= 18){ echo '满18岁,已成年'. '';}// 双分支$age = 12;if($age >= 18){ echo '满18岁,你已成年';} else{ e...
函数中引用外部变量的5种方法// 1. global 关键字$name = '老朱';function name(){ global $name ; return $name;}echo name() . '';// 2. 超全局数组: ...