Requests_Session::__set( string $key, mixed $value )
Set a property’s value
Parameters
- $key
 -  
(string) (Required) Property key
 - $value
 -  
(mixed) (Required) Property value
 
Source
File: wp-includes/Requests/Session.php
public function __set($key, $value) {
		$this->options[$key] = $value;
	}  
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/classes/requests_session/__set