PHP 有一个比较运算符 ==，使用它可以执行两个 objecs 变量的简单比较。如果两者属于同一类并且相应属性的值相同，则返回 true。
PHP 的 === 运算符比较两个对象变量，当且仅当它们引用时返回 true相同类的相同实例
我们使用以下两个类来比较对象与这些操作符
<?php
class test1{
private $x;
private $y;
function __construct($arg1, $arg2){
$this->x=$arg1;
$this->y=$arg2;
}
}
class test2{
private $x;
private $y;
function __construct($arg1, $arg2){
$this->x=$arg1;
$this->y=$arg2;
}
}
?>$a=new test1(10,20); $b=new test1(10,20); echo "two objects of same class"; echo "using == operator : "; var_dump($a==$b); echo "using === operator : "; var_dump($a===$b);
two objects of same class using == operator : bool(true) using === operator : bool(false)
$a=new test1(10,20); $c=$a; echo "two references of same object"; echo "using == operator : "; var_dump($a==$c); echo "using === operator : "; var_dump($a===$c);
two references of same object using == operator : bool(true) using === operator : bool(true)
$a=new test1(10,20); $d=new test2(10,20); echo "two objects of different classes"; echo "using == operator : "; var_dump($a==$d); echo "using === operator : "; var_dump($a===$d);
Output shows following result
two objects of different classes using == operator : bool(false) using === operator : bool(false)
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