(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_save_string — Returns the FDF document as a string
$fdf_document): stringReturns the FDF document as a string.
Returns the document as a string, or false on error.
示例 #1 Retrieving FDF as a string
<?php
$fdf = fdf_create();
fdf_set_value($fdf, "foo", "bar");
$str = fdf_save_string($fdf);
fdf_close($fdf);
echo $str;
?>以上示例会输出：
%FDF-1.2 %âãÏÓ 1 0 obj << /FDF << /Fields 2 0 R >> >> endobj 2 0 obj [ << /T (foo)/V (bar)>> ] endobj trailer << /Root 1 0 R >> %%EOF