<?php
function readParamSFO($data) {
	$keytable_offset = unpack('I',substr($data,8,4))[1];
	$data_offset = unpack('I',substr($data,12,4))[1];
	$table_entries = unpack('I',substr($data,16,4))[1];

	$keytable = array_filter(explode("\0",substr($data,$keytable_offset,($data_offset - $keytable_offset))));
	$idxtable = substr($data,20,($keytable_offset-20));
	$data = substr($data,$data_offset,-1);

	$pos = 0;
	$i = 1;
	while ($pos < strlen($idxtable)) {
		$key[$i]['start'] = unpack('I',substr($idxtable,$pos,2)."\0\0")[1];
		$pos = $pos + 2;
		$key[$i]['fmt'] = unpack('I',substr($idxtable,$pos,2)."\0\0")[1];
		$pos = $pos + 2;
		$key[$i]['len'] = unpack('I',substr($idxtable,$pos,4))[1];
		$pos = $pos + 4;
		$key[$i]['max_len'] = unpack('I',substr($idxtable,$pos,4))[1];
		$pos = $pos + 4;
		$key[$i]['offset'] = unpack('I',substr($idxtable,$pos,4))[1];
		$pos = $pos + 4;
		$i++;
	}
	$i = 0;
	foreach ($key as $k) {
		$pm = substr($data,$k['offset'],$k['len']);
		$param[$keytable[$i]] = trim($pm);
		$i++;
	}
	return $param;
}

/* Provide readParamSFO function with raw PARAM.SFO binary data. */
/* It will return an array.                                      */

$fp = fopen("PARAM.SFO","r");
$data = fread($fp,4096);
fclose($fp);

print_r(readParamSFO($data));

/*
The array may look like this:

Array
(
    [APP_VER] => 01.00
    [ATTRIBUTE] => ▒
    [BOOTABLE] =>
    [CATEGORY] => DG
    [LICENSE] => Library programs ©Sony Computer Entertainment Inc. Licensed for play on the PLAYSTATION®3 Computer Entertainment System or 
authorized PLAYSTATION®3 format systems. For full terms and conditions see the user's manual. This product is authorized and produced under 
license from Sony Computer Entertainment Inc. Use is subject to the copyright laws and the terms and conditions of the user's license.
    [PARENTAL_LEVEL] =>
    [PS3_SYSTEM_VER] => 03.4100
    [RESOLUTION] => 7
    [SOUND_FORMAT] =>
    [TITLE] => DanceDanceRevolution
    [TITLE_ID] => BLUS30433
    [VERSION] => 01.00
)

*/