(PHP 4 >= 4.0.5, PECL pdflib >= 1.0.0)
PDF_get_pdi_parameter — Get PDI string parameter [deprecated]
$p
    , string $key
    , int $doc
    , int $page
    , int $reserved
    )Gets the contents of a PDI document parameter with string type.
This function is deprecated since PDFlib version 7, use PDF_pcos_get_string() instead.