The doc says that an empty file name will cause PHP to output the FDF to 'stdout'. I had no success on this (with PHP 4.2.3 and fdftk v5): no string, an empty string and null all returned a message complaining about 'wrong parameter count'.
So I used the way (saving to a file and using passthru) given as an example on the page describing fdf_create(), and added a uniqid(rand(),1) to the filename to avoid clashes. This worked well.
fdf_save
Description
bool fdf_save ( resource fdf_document [, string filename] )The fdf_save() function saves a FDF document. The resulting FDF will be written to filename. Without a filename fdf_save() will write the FDF to the default PHP output stream.
See also fdf_save_string(), fdf_create() and fdf_close().
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User Contributed Notes
karsten at k-fish dot de
12-Apr-2003 01:18
12-Apr-2003 01:18