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<?php
function get_dpi ( $filename ){
// open the file and read first 20 bytes.
$a = fopen ( $filename , 'r' );
$string = fread ( $a , 20 );
fclose ( $a );
// get the value of byte 14th up to 18th
$data = bin2hex ( substr ( $string , 14 , 4 ));
$x = substr ( $data , 0 , 4 );
$y = substr ( $data , 4 , 4 );
hexdec ( $x ), hexdec ( $y ));
// sample, output the result:
print_r ( get_dpi2 ( 'filename.jpg' ));
?>
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