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This script will read DPI value of provided image file.
| <?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);
return array(hexdec($x),hexdec($y));
}
// sample, output the result:
print_r(get_dpi2('filename.jpg'));
?> | |
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