allow_url_fopen = On;
allow_url_include = On;

curl -v http://www.example.com/image.jpg

Allow from 123.45.6.7.8

$pdf->Image($base_url.'/'.$node->field_loc_images[0]['filepath'] ,30, 40, 75, 113, 'JPG', '', '', true, 300, '');

// set font
$fontname = $pdf->addTTFfont('../your path here/sampletruetype.ttf', 'TrueTypeUnicode', '', 32);

$pdf->SetFont($fontname, '', <font size value here>);

foreach($node->field_loc_images as $key=> $s)
{
    $pdf->Image($base_url.'/'.$s['filepath'], $x, $y, $w, $h, 'JPG', '', '', false, 300, '', false, false, 0, $fitbox, false, false);
}

$img = getcwd().'/web/bundles/_bundlename_/img/logo.png';