Write and read php object in a text file?

Write and read php object in a text file?

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.