我有这个过去有效的代码：
$pdf = new TCPDF('L', 'In', 'LETTER', true);
$pdf->SetPrintHeader(false);
$pdf->SetPrintFooter(false);
$pdf->SetFont('Times','B',11);
$pdf->AddPage();
$pdf->SetLeftMargin(0.5);
$pdf->SetLineWidth(.04);
$pdf->Rect(.5, .5, 10, 7.5);
$pdf->SetLineWidth(.01);
$pdf->Rect(.55, .55, 9.89, 7.39);
$pdf->setFont('Times', 'BI', 31);
$pdf->SetXY(0.5,0.9);
$pdf->Cell( 9.75, 0.5, 'Certificate of Completion',0,1,'C');
$pdf->setFont('Helvetica', 'B', 11);
$pdf->SetXY(0.5,1.75);
$pdf->Cell( 9.75, 0.2, 'Course Work or Training in Infection Control',0,1,'C');
$pdf->Cell( 9.75, 0.2, 'Approved by', 0, 1, 'C');
$pdf->Cell( 9.75, 0.2, 'The New York State Department of Health &', 0, 1, 'C');
$pdf->Cell( 9.75, 0.2, 'The New York State Department of Education', 0, 1, 'C');
现在输出如下所示：
我试着添加这个：
$pdf->setFontSpacing(100);
但脚本未能执行。
怎么了？