通常它是$pdf->Cell(0, $height, "text", 0, 0, 'C');，但是如果你在Header或Footer函数中这样做，它是$this->Cell(0, $height, "text", 0, 0, 'C')，如果你在function（）调用中这样做，不要忘记声明$height为全局变量。

谢谢你，托尔！这对我很有效：

$mid_x = 135; // the middle of the "PDF screen", fixed by now.
$text = $userFullName;
$pdf_file->Text($mid_x - ($pdf_file->GetStringWidth($text) / 2), 102, $text);

这可能对你有用

MultiCell(0,$height,'You can<P ALIGN="center">center a line</P>',0,'C')

$pdf->Text($mid_x-$pdf->GetStringWidth($text)/2,$y,$text);

全局$标题;

// Calculate width of text and position
            $w = $this->GetStringWidth($title)+6;
            $this->SetX((210-$w)/2);
            
        
            // Line break
            $this->Ln(10);

         
            
            $title = 'YOUR TEXT HERE';
            $this->SetTitle($title);
            $this->SetTextColor(0,0, 0);
            $this->SetFont('Arial','',17);
            $this->SetX(((210-$w)/4),(-50));
            $this->Cell(10, 20, $title);