Created
          February 11, 2013 14:14 
        
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    Get image DPI in flat PHP
  
        
  
    
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  | function get_dpi($filename){ | |
| $a = fopen($filename,'r'); | |
| $string = fread($a,20); | |
| fclose($a); | |
| $data = bin2hex(substr($string,14,4)); | |
| $x = substr($data,0,4); | |
| $y = substr($data,0,4); | |
| return array(hexdec($x),hexdec($y)); | |
| } | 
  
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this behaves weird, just a note.