PHP generates PDF format files and encrypts _php instances

Project requirements: PHP generated PDF file, and the file encryption or set access password

Open source Tcpdf is a set of class libraries based on PHP, which can produce documents in PDF format well. and support file encryption, in the current open source PHP framework, systems, applications are also widely used. Here is a method prototype for setting the related properties of a PDF document, where you can set a password

Tcpdf::setprotection 
(
$permissions = Array (' print ', ' modify ', ' Copy ', ' annot-forms ', ' fill-forms ', ' extract ') , ' assemble ', ' Print-high '), 
$user _pass = ', 
$owner _pass = null, 
$mode = 0, 
$pubkeys = null 
)

After the Setprotection () method is set, the generated PDF document is encrypted, and the user will be asked to enter the access password when they open the PDF document.