PHP : echo image gif 1x1 pixcel

Code :

//Header
header("Cache-Control: private");
header("Content-Type: text/html; charset=tis620");
header('P3P: CP=NOI DSP COR NID ADMa OUR IND NAV; policyref="/w3c/p3p.xml"');
header("Content-Type: image/gif");
header("Content-Length: 43");

echo chr(0x47).chr(0x49).chr(0x46).chr(0x38).chr(0x39).chr(0x61).chr(0x01).chr(0x00).
chr(0x01).chr(0x00).chr(0x80).chr(0x00).chr(0x00).chr(0x04).chr(0x02).chr(0x04).
chr(0x00).chr(0x00).chr(0x00).chr(0x21).chr(0xF9).chr(0x04).chr(0x01).chr(0x00).
chr(0x00).chr(0x00).chr(0x00).chr(0x2C).chr(0x00).chr(0x00).chr(0x00).chr(0x00).
chr(0x01).chr(0x00).chr(0x01).chr(0x00).chr(0x00).chr(0x02).chr(0x02).chr(0x44).
chr(0x01).chr(0x00).chr(0x3B);