In PHP, compare the difference between the operator and the congruent operator ____php

Take a moment to jot down a point of knowledge that is being developed today.

In PHP, when comparing two object variables with the comparison operator (= =): If the properties and property values of the two objects are equal, and two objects are instances of the same class, the two object variables are considered equal.

If you use the strict equality operator (= = =), the two object variables must point to the same instance of a class (that is, the same object).

Give a chestnut:

$obj _1 = new Myclass ();
$obj _2 = new Myclass ();
$obj _ref = $obj _1;
Var_dump ($obj _1== $obj _2);//true
var_dump ($obj _1=== $obj _2);//false

var_dump ($obj _1== $obj _ref);//true
var_dump ($obj _1=== $obj _ref);//true