类的扩展// __get()class user{ private array $data =[ 'age' => 18, ]; public function __get($name) { ...

include和require的区别// include// 相对路径include 'inc/hello.php';// 绝对路径include __DIR__ . '/inc/hello.php';echo $username;// requir...

5种数组函数array_intersect($arr1,$arr2):返回差集结果数组$arr1 = [1,5,8,9,12,15];$arr2 = [4,6,8,11,12,16];$arr = array_intersect($arr1, $ar...

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: ...