数据类型与变量
数据类型详解
- 标量类型：int、float、string、bool
- 复合类型：array、object、callable、iterable
- 特殊类型：null、resource
$a = 42;
$b = 3.14;
$c = "hello";
$d = false;
$arr = [1, 2, 3];
$obj = (object)["x" => 1, "y" => 2];
$f = function($x) { return $x * $x; };$a = 42;
$b = 3.14;
$c = "hello";
$d = false;
$arr = [1, 2, 3];
$obj = (object)["x" => 1, "y" => 2];
$f = function($x) { return $x * $x; };