Write and read php object in a text file?

Question

I want to write a php object in a text file. The php object is like that

 $obj = new stdClass();
 $obj->name = "My Name";
 $obj->birthdate = "YYYY-MM-DD";
 $obj->position = "My position";

I want to write this $obj in a text file. The text file is located in this path

$filePath = getcwd().DIRECTORY_SEPARATOR."note".DIRECTORY_SEPARATOR."notice.txt"

I want a simple way to write this object into the text file and want to read the file to get the properties as I defined. Please help me.

Thanks in advance.