Check if PHP object can be compared

2018-06-20 20:18:54

Some PHP objects such as instances of DateTime can be compared with greater than or less than. Given

$time_1 = new DateTime('2016-02-24 15:22:01');
$time_2 = new DateTime('2016-01-30 10:41:29');

then the comparison time_1<time_2 is valid and will evaluate to false.

Comparisons like this can't be done for objects we create from our own classes.

Given an object, is it possible to determine whether it can be compared with the greater than or less than symbols?

Edit:

I'd like some way to test an object is from a class which has overloaded the comparison operators. Eg:

class MyClass {}
$obj_1 = new MyClass();
$obj_2 = new DateTime();

has_overloaded( $obj_1 ); //false
has_overloaded( $obj_2 ); //true

链接地址: http://www.djcxy.com/p/58590.html