(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_save_string — Returns the FDF document as a string
fdf_save_string ( resource $fdf_document ) : string
Returns the FDF document as a string.
fdf_document
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
Returns the document as a string, or false on error.
Example #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; ?>
The above example will output:
%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
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https://www.php.net/manual/en/function.fdf-save-string.php