- json_encode: documentation ( source)
<?php
$note = new SimpleXMLElement('<Note></Note>');
$note->addChild("string0", 'just a string');
$note->addChild("string1", "abc\n\n\n");
$note->addChild("string2", "\tdef");
$note->addChild("string3", "\n\n\n");
$note->addChild("string4", "\t\n");
echo json_encode($note);