Fatal Error: Call to undefined method FPDF - fatal-error

Question

I got this error message. Please help me solve that.
Fatal error: Call to undefined method FPDF::check() in C:\xampp\htdocs\sikembul\application\views\viw_slip_gaji.php on line 38
this my code
<?php
$GLOBALS['a']=2;
$GLOBALS['alpha']=3;
$GLOBALS['beta']=5;
function check($num)
{
if ($num=="1")
{
global $a;
global $alpha;
global $beta;
$total = $a*$alpha*$beta;
$this->fpdf->Cell(50,5,'final',1,0,'L');
$this->fpdf->Cell(8,5,'xx.',1,0,'L');
$this->fpdf->Cell(20,5,$total,1,1,'R');
}
else
{
global $a;
global $alpha;
global $beta;
$total = $a-$alpha-$beta;
$this->fpdf->Cell(50,5,'final',1,0,'L');
$this->fpdf->Cell(8,5,'xx.',1,0,'L');
$this->fpdf->Cell(20,5,$total,1,1,'R');
}
}
$this->fpdf->FPDF('P','mm','A5');
$this->fpdf->SetMargins(10,10,10);
$this->fpdf->AddPage();
$this->fpdf->setFont('Times','B',9);
$this->fpdf->Cell(130,5,'Here Some Text to Display',0,1,'C');
$this->fpdf->check(1);
$this->fpdf->Output('generate.pdf','I');
?>
FYI, everything works fine when i disable the function.
Thanks for all of the help and comments.

Answer 1

You can try this. Passing the instance to the function may work. This is just a quick sample and may not work as expected, but it illustrates what I was suggesting in the comment.
<?php
$GLOBALS['a']=2;
$GLOBALS['alpha']=3;
$GLOBALS['beta']=5;
function check($num, &$fpdf)
{
global $a;
global $alpha;
global $beta;
if ($num=="1")
{
$total = $a*$alpha*$beta;
$fpdf->Cell(50,5,'final',1,0,'L');
$fpdf->Cell(8,5,'xx.',1,0,'L');
$fpdf->Cell(20,5,$total,1,1,'R');
}
else
{
$total = $a-$alpha-$beta;
$fpdf->Cell(50,5,'final',1,0,'L');
$fpdf->Cell(8,5,'xx.',1,0,'L');
$fpdf->Cell(20,5,$total,1,1,'R');
}
}
$this->fpdf->FPDF('P','mm','A5');
$this->fpdf->SetMargins(10,10,10);
$this->fpdf->AddPage();
$this->fpdf->setFont('Times','B',9);
$this->fpdf->Cell(130,5,'Here Some Text to Display',0,1,'C');
check(1, $this->fpdf);
$this->fpdf->Output('generate.pdf','I');
?>