(PHP 4, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_next_field_name — Get the next field name
fdf_next_field_name ( resource $fdf_document [, string $fieldname ] ) : string
Gets the name of the field after the given field. This name can be used with several functions.
fdf_document
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
fieldname
Name of the FDF field, as a string. If not given, the first field will be assumed.
Returns the field name as a string.
Example #1 Detecting all fieldnames in a FDF
<?php
$fdf = fdf_open($HTTP_FDF_DATA);
for ($field = fdf_next_field_name($fdf);
$field != "";
$field = fdf_next_field_name($fdf, $field)) {
echo "field: $field\n";
}
?>
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https://www.php.net/manual/en/function.fdf-next-field-name.php