FPDF: different header logo

Question

I use the FPDF Class in PHP to create PDFs. All works well, but now I need the PDF with different logos in the header.

Creating a header works well.

class PDF extends FPDF {
  function Footer() {
    // some code
  }

  function Header() {
    $this->Image('PDF/images/pdf_header.png', 0, 0, 215);
  }
}

Now I need something like this. The variable "$is_summer" exists in my file.

class PDF extends FPDF {
  function Footer() {
    // some code
  }

  function Header() {
    if ($is_summer)
      $this->Image('PDF/images/pdf_header_summer.png', 0, 0, 215);
    } else {
      $this->Image('PDF/images/pdf_header_winter.png', 0, 0, 215);
    }
  }
}

But I get: Notice: Undefined variable: is_summer in createPDFpriv.php on line 200.

Ok, undefined var. So I tried

function Header($is_summer) {
  if ($is_summer)
    $this->Image('PDF/images/pdf_header_summer.png', 0, 0, 215);
  } else {
    $this->Image('PDF/images/pdf_header_winter.png', 0, 0, 215);
  }
}

Another error: Warning: Declaration of PDF::Header($is_summer) should be compatible with FPDF::Header() in createPDFpriv.php on line 145

Also tried:

 if ($is_summer) {
   function Header() {
     $this->Image('PDF/images/pdf_header_summer.png', 0, 0, 215);
   }
 } else {
   function Header() {
     $this->Image('PDF/images/pdf_header_winter.png', 0, 0, 215);
   }
 }

Also an error: parse error: syntax error, unexpected 'if' (T_IF), expecting function (T_FUNCTION) in createPDFpriv.php on line 199. Ok, there is a function expected, this doesn't work.

Can anyone help?

Answer 1

Perhaps you have forgotten " $this " before " is_summer "? You can try this :

class PDF extends FPDF{

	private $isSummer = false;
	function __construct($summer) {
		parent::__construct();
		$this->isSummer = $summer;
		print "In BaseClass constructor\n";
	}

	function Header() {
		if ($this->isSummer) {
			$this->Image('PDF/images/pdf_header_summer.png', 0, 0, 215);
		} else {
			$this->Image('PDF/images/pdf_header_winter.png', 0, 0, 215);
		}
	}
}

and when using it :

$mysummer = true; // or false
$mypdf = new PDF($mysummer);