<?php

$filename = 'C:\tree picture\IMG_0804.jpg';

var_dump(get_jpeg_data($filename));

// Large Portions from http://www.ozhiker.com/electronics/pjmt/
function get_jpeg_data($filename)
{
		$seg_names = array(
			0xC0 =>  'SOF0',  0xC1 =>  'SOF1',  0xC2 =>  'SOF2',  0xC3 =>  'SOF4',
			0xC5 =>  'SOF5',  0xC6 =>  'SOF6',  0xC7 =>  'SOF7',  0xC8 =>  'JPG',
			0xC9 =>  'SOF9',  0xCA =>  'SOF10', 0xCB =>  'SOF11', 0xCD =>  'SOF13',
			0xCE =>  'SOF14', 0xCF =>  'SOF15',
			0xC4 =>  'DHT',   0xCC =>  'DAC',
			
			0xD0 =>  'RST0',  0xD1 =>  'RST1',  0xD2 =>  'RST2',  0xD3 =>  'RST3',
			0xD4 =>  'RST4',  0xD5 =>  'RST5',  0xD6 =>  'RST6',  0xD7 =>  'RST7',
			
			0xD8 =>  'SOI',   0xD9 =>  'EOI',   0xDA =>  'SOS',   0xDB =>  'DQT',
			0xDC =>  'DNL',   0xDD =>  'DRI',   0xDE =>  'DHP',   0xDF =>  'EXP',
			
			0xE0 =>  'APP0',  0xE1 =>  'APP1',  0xE2 =>  'APP2',  0xE3 =>  'APP3',
			0xE4 =>  'APP4',  0xE5 =>  'APP5',  0xE6 =>  'APP6',  0xE7 =>  'APP7',
			0xE8 =>  'APP8',  0xE9 =>  'APP9',  0xEA =>  'APP10', 0xEB =>  'APP11',
			0xEC =>  'APP12', 0xED =>  'APP13', 0xEE =>  'APP14', 0xEF =>  'APP15',
			
			
			0xF0 =>  'JPG0',  0xF1 =>  'JPG1',  0xF2 =>  'JPG2',  0xF3 =>  'JPG3',
			0xF4 =>  'JPG4',  0xF5 =>  'JPG5',  0xF6 =>  'JPG6',  0xF7 =>  'JPG7',
			0xF8 =>  'JPG8',  0xF9 =>  'JPG9',  0xFA =>  'JPG10', 0xFB =>  'JPG11',
			0xFC =>  'JPG12', 0xFD =>  'JPG13',
			
			0xFE =>  'COM',   0x01 =>  'TEM',   0x02 =>  'RES'
		);

		$fp = @fopen($filename, 'rb');
		if (!$fp)
		{
			return false;
		}

		// Read the first two characters
		$data = fread($fp, 2);

		// Check that the first two characters are 0xFF 0xDA  (SOI - Start of image)
		if ($data !== "\xFF\xD8")
		{
			// No SOI (FF D8) at start of file - This probably isn't a JPEG file - close file and return;
			fclose($fp);
			return false;
		}

		// Read the third character
		$data = fread($fp, 2);

		// Check that the third character is 0xFF (Start of first segment header)
		if ($data{0} !== "\xFF")
		{
			// NO FF found - close file and return - JPEG is probably corrupted
			fclose($fp);
			return false;
		}

		// Flag that we havent yet hit the compressed image data
		$image_data = false;


		// Cycle through the file until, one of: 1) an EOI (End of image) marker is hit,
		//									   2) we have hit the compressed image data (no more headers are allowed after data)
		//									   3) or end of file is hit

		while (($data{1} !== "\xD9") && !$image_data && !feof($fp))
		{
			// Found a segment to look at.
			// Check that the segment marker is not a Restart marker - restart markers don't have size or data after them
			$segment = ord($data{1});
			
			if (($segment < 0xD0) || ($segment > 0xD7))
			{
				// Segment isn't a Restart marker
				// Read the next two bytes (size)
				$string_size = fread($fp, 2);

				// convert the size bytes to an integer
				$decoded_size = unpack('n', $string_size);

				// Save the start position of the data
				$seg_data_start = ftell($fp);

				// Read the segment data with length indicated by the previously read size
				$seg_data = fread($fp, $decoded_size[1] - 2);


				// Store the segment information in the output array
				$header_data[] = array(
					'seg_type'		=> $segment,
					'seg_name' 		=> $seg_names[$segment],
					'seg_datastart'	=> $seg_data_start,
					'seg_data'		=> $seg_data
				);
			}

			// If this is a SOS (Start Of Scan) segment, then there is no more header data - the compressed image data follows
			if ($segment == 0xDA)
			{
				$compressed_data = '';
				while (!feof($fp))
				{
					$compressed_data .= fread($fp, 1048576);
				}
				// Strip off EOI and anything after
				$eoi_pos = strpos($compressed_data, "\xFF\xD9");
				$compressed_data = substr($compressed_data, 0, $eoi_pos);
			}
			else
			{
				// Not an SOS - Read the next two bytes - should be the segment marker for the next segment
				$data = fread($fp, 2);

				// Check that the first byte of the two is 0xFF as it should be for a marker
				if ($data{0} !== "\xFF")
				{
					// NO FF found - close file and return - JPEG is probably corrupted
					fclose($fp);
					return false;
				}
			}
		}

		// Close File
		fclose($fp);

		// Return the header data retrieved
		return array('header' => $header_data, 'data' => $compressed_data);
}
?>