$a = Array("From" => "test <example@gmail.com>","To" => "test test <test1@gmail.com>, test 2<test2@gmail.com>");
print_r(json_encode($a));

{"From":"test ","To":"test test , test 2"}

{"From":"test <example@gmail.com>","To":"test test <test1@gmail.com>, test 2<test2@gmail.com>"}