https://dartandflutter.com/overrid-tostring-method-in-a-dart-class/
If you have a class and you override the toString() method, it will return such a string method when the instance/object of the class is printed.
in adartoverridetostringmethod
https://www.w3schools.com/pHp/func_simplexml__tostring.asp
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
phptostringfunction
https://www.php.net/manual/ja/mongodb-bson-objectidinterface.tostring.php
Returns the hexidecimal representation of this ObjectIdInterface
phpmongodbbsontostringmanual
https://www.php.net/manual/pt_BR/directoryiterator.tostring.php
Retorna o nome do arquivo como texto
phptostringmanual
https://www.ibm.com/docs/en/db2/11.5.x?topic=m-tostring-3
Returns a string that represents the DB2Clob structure.
tostringmethod