The idea is as follows, to make a creation of PDFs a little bit cleaner, I am supposed to create a Factory/Abstract class that will a set of predefined functions like so
class AbstractPDF{
protected $pdf;
protected $searchpath;
public function __construct(){
$this->pdf = PDF_new();
$this->searchpath = "fonts/";
pdf_set_option($this->pdf,"errorpolicy=return");
pdf_set_option($this->pdf,"searchpath={" . $this->searchpath . "}");
pdf_set_option($this->pdf,"stringformat=utf8");
}
protected function startAFourPage(){
pdf_begin_page_ext($this->pdf, 0, 0, "width=a4.width height=a4.height");
}
/* When setting up any of the PDF content types, one should */
/* remember that in PDFLib, x=>y axis start with 0(zero) at */
/* lower left corner. */
/* The text line is set up in space by setting up the */
/* coordinates of the lower left corner and then providing */
/* height and width of the object as separate values */
protected function setupTextLine($xcoordinate, $ycoordinate, $width, $height,
$fontName, $fontEncoding, $fontSize, $text, $textPosition = "left"){
//adding text directly through the PDFLib documentation
$font = PDF_load_font($this->pdf, $fontName, $fontEncoding, "");
PDF_setfont($this->pdf, $font, $fontSize);
//PDF_set_text_pos($this->pdf, 25, 650);
//PDF_show($this->pdf, $text);
PDF_fit_textline ($this->pdf, $text, 111, 744, "boxsize {".$width." ".$height."} position=left");
}
/* When setting up any of the PDF content types, one should */
/* remember that in PDFLib, x=>y axis start with 0(zero) at */
/* lower left corner. */
/* The text flow is set up by providing the coordinate for */
/* lower left corner and upper right, as a rule. */
/* But overall PDFLib will placed it by coordinates for */
/* two corners diagonal to each other. */
/* For this class we will identify these corners as */
/* lowLeft and upperRight */
protected function setupMultilineTextflow($lowLeftX, $lowLeftY, $upperRightX, $upperRightY,
$fontName, $fontEncoding, $fontSize, $text){
$orderDetails = 'Datum:
Auftrags-NR:
Auftragsname:
Kunden-Nr:';
$textFlow = PDF_create_textflow($this->pdf, $text,
"fontname=".$fontName."
fontsize=".$fontSize."
encoding=".$fontEncoding);
PDF_fit_textflow($this->pdf, $textFlow3, $lowLeftX, $lowLeftY, $upperRightX, $upperRightY,"");
}
protected function setupTable($headers=array('test'=>''), array $field){
}
}
?>
This class is called from a following
class PDF extends AbstractPDF{
public function __construct(){
parent::__construct();
parent::startAFourPage();
}
public function generateContent(){
return "";
}
}
I apologize for having so much code, but I wanted to draw a full picture.
The issue is that when I try to call these classes I get a following error:
2017/12/19 18:47:58 [error] 465#465: *252 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught PDFlibException: Function must not be called in 'object' scope in/var/www/dev-vm-stretch.de/htdocs/AbstractPDF.php:30
Stack trace:
#0 /var/www/dev-vm-stretch.de/htdocs/AbstractPDF.php(30): pdf_begin_page_ext(Resource id #1, 0, 0, 'width=a4.width ...')
#1 /var/www/dev-vm-stretch.de/htdocs/PDF.php(10): AbstractPDF->startAFourPage()
#2 /var/www/dev-vm-stretch.de/htdocs/index.php(18): PDF->__construct()
#3 {main}
thrown in /var/www/dev-vm-stretch.de/htdocs/AbstractPDF.php on line 30" while reading response header from upstream, client: 192.168.34.51, server: dev-vm-stretch.de, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.0-fpm.sock:", host: "dev-vm-stretch.de"
I think that is because I separated the PDFLib related code into functions, but I am not 100% sure as my PDFLib experience is limited to slightly more then 5 days and I haven't found any PDFLib tutorials that would deal with these kind of issues :-(
Any ideas on how this error could be fixed are welcomed.
the issue is simple. You can only create a page, when you have an output document. You create a new output document, with begin_document($file, $options); You might at this as well to __construct.
You might check PDFlib 9.1.1 API reference, chapter 1.2 "Function Scopes". Also all PDFlib PHP samples (including in the PDFlib PHP package), demonstrate the correct usage.