Add main header on first page only in TCPDF

You can check examples of tcpdf and you can inherit TCPDF class and use that class:

class YOUR_CLASS extends TCPDF {    /**    * Overwrite Header() method.    * @public    */    public function Header() {        // if ($this->tocpage) or        if ($this->page == 1) {            // *** replace the following parent::Header() with your code for TOC/page you want page            // parent::Header();            // this will add logo and text to first page            $this->Image('http://localhost/first_page_logo.png', 10, 10, 15, '', 'PNG', '', 'T', false, 300, '', false, false, 0, false, false, false);            $this->SetFont('helvetica', 'B', 14);            $this->Cell(0, 15, 'First page header text', 0, false, 'C', 0, '', 0, false, 'M', 'M');        } else {            // *** replace the following parent::Header() with your code for other pages            //parent::Header();            // following will add your own logo ant text to other pages            $this->Image('http://localhost/other_pages_logo.png', 10, 10, 15, '', 'PNG', '', 'T', false, 300, '', false, false, 0, false, false, false);            $this->SetFont('helvetica', 'B', 14);            $this->Cell(0, 15, 'Other pages header text', 0, false, 'C', 0, '', 0, false, 'M', 'M');        }    }} // end of class

and than remove:

$obj_pdf = new TCPDF('L', PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);

with:

$obj_pdf = new YOUR_CLASS('L', PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);