$type = 'TD'], [int
$body = 0])
Sets the cell contents for an existing cell
If the given indices do not exist and autoGrow is true then the given row and/or col is automatically added. If autoGrow is false then an error is returned.
May contain html or any object with a toHTML() method; it is an array (with strings and/or objects), $col will be used as start offset and the array elements will be set to this and the following columns in $row