PHP面向对象程序设计内置标准类，普通数据类型

class stdclass{ }

<?php
$obj1 = new stdclass();
var_dump($obj1);
class A{}
$obj2 = new A();
var_dump($obj2);
?>

$obj1->pp1 = 1;
$obj2->port = '3306';

<?php
$config = array(
  'host' => "localhost",
  'port' => 3306,
  'user' => "root",
  'pass' => "123",
  'charset' => "utf8",
  'dbname' => "yeoman",
);
$obj1 = (object)$config;
var_dump($obj1);
echo "<br />单独取出user" . $obj1->user;
?>

<?php
$arr = array('pp1' => 1, 5 => 12);
$obj2 = (object)$arr;
var_dump($obj2);
echo "<br />单独取出pp1" . $obj2->pp1;
//echo "<br />单独取出5" . $obj2->5;//会报错！
?>

$arr = array('pp1' => 1, 5 => 12);
$obj2 = (object)$arr;
var_dump($obj2);
echo "<br />单独取出pp1" . $obj2->pp1;
//echo "<br />单独取出5" . $obj2->5;//会报错！
?>

$obj = (object)null;

<?php
$v1 = 1;
$v2 = 2.2;
$v3 = "abc";
$v4 = true;
$objv1 = (object)$v1;  //整型转为对象类型
$objv2 = (object)$v2;  //浮点型转为对象类型
$objv3 = (object)$v3;  //字符串型为对象类型
$objv4 = (object)$v4;  //布尔转为对象类型
var_dump($objv1); echo "<br />";
var_dump($objv2); echo "<br />";
var_dump($objv3); echo "<br />";
var_dump($objv4); echo "<br />";