Trying to decode php code from unknown format - php

Question

I have this code (sample out of 24500 line code is provided below) in php language and I want to use this code in my project but problem is that, It is converted to unknown format.
$O = array( function($XB0) use (&$O)
{
$lej = array( 6323 => "sq", 1630 => "invalid_perfectmoney_account", 1462 => "Lebanon", 1867 => "/<br> Cash Passport Result URL - ", 261 => "alertpay_from_account", 5096 => " + interval 1 hour and deposit_id = ", 7651 => " group by t.id ", 845 => "select email from hm2_users where id = 1", 5952 => "Location: ", 9642 => "]", 3792 => "select username from hm2_users where id = ", 1591 => "update hm2_users set verify = 1 where id = " );
return $lej[$XB0];
}
, 289, 691, 561, 691, function($LBV) use (&$O)
{
$b4X = array( 1591 => "zero_amount", 3792 => "l dS of F Y h:i:s A", 1630 => "QXCR58Z29CNWP8GVKDXP", 1867 => "India", 845 => "Define Key String (random string)", 7651 => "actual_amount", 5096 => "k", 261 => "</ns1:Receiver> <ns1:Currency>", 5952 => ") as create_account_date, now() - interval 2 minute > l_e_t as should_count from hm2_users where ", 9642 => "update hm2_users set password = ", 1462 => "Romania", 6323 => ", ip_reg = ", 4683 => "qplans" );
return $b4X[$LBV];
}
, 515, 901, 487, 779, function($wjS, $I8j, $Sbx) use (&$O)
{
if( $I8j[$O[327](7651)] == $O[1299](7651) )
{
$S3J = 0;
print " ";
if( $I8j[$O[90](5096)] != "" )
{
$S3J = 1;
$O[703](7651);
print $O[703](7651);
$O[161](7651);
print $I8j[$O[161](7651)];
$O[1184](7651);
print $O[1184](7651);
$O[161](7651);
print $I8j[$O[161](7651)];
$O[478](5096);
print $O[478](5096);
}
$O[703](7651);
print $O[703](7651);
$O[161](7651);
print $I8j[$O[161](7651)];
$O[828](7651);
print $O[828](7651);
print ($S3J ? $O[814](7651) : "");
$O[39](7651);
print $O[39](7651);
$O[1043](7651);
print $I8j[$O[1043](7651)];
$O[194](5096);
print $O[194](5096);
$O[380]($I8j[$O[1016](7651)]);
print $O[380]($I8j[$O[1016](7651)]);
$O[99](5096);
print $O[99](5096);
if( $S3J )
{
$O[996](7651);
print $O[996](7651);
$O[1043](7651);
print $I8j[$O[1043](7651)];
$O[467](7651);
print $O[467](7651);
$O[161](7651);
print $I8j[$O[161](7651)];
$O[1244](5096);
print $O[1244](5096);
$O[161](7651);
print $I8j[$O[161](7651)];
$O[1236](7651);
print $O[1236](7651);
}
$O[1063](845);
print $O[1063](845);
}
else
{
if( $I8j[$O[327](7651)] == $O[582](5096) )
{
$O[1189](5096);
print $O[1189](5096);
$O[1043](7651);
print $I8j[$O[1043](7651)];
$O[103](7651);
print $O[103](7651);
$O[380](($I8j[$O[90](5096)] != "" ? $I8j[$O[90](5096)] : $I8j[$O[100](7651)]));
print $O[380](($I8j[$O[90](5096)] != "" ? $I8j[$O[90](5096)] : $I8j[$O[100](7651)]));
$O[536](7651);
print $O[536](7651);
$O[380]($I8j[$O[1016](7651)]);
print $O[380]($I8j[$O[1016](7651)]);
$O[446](7651);
print $O[446](7651);
}
else
{
if( $I8j[$O[327](7651)] == $O[793](7651) )
{
$O[965](5096);
print $O[965](5096);
$O[1043](7651);
print $I8j[$O[1043](7651)];
$O[888](7651);
print $O[888](7651);
foreach( $DSo as $lIx => $RdI )
{
print " ";
if( $RdI[$O[735](7651)] == 1 )
{
$O[327](5096);
print $O[327](5096);
print $lIx;
$O[937](5096);
print $O[937](5096);
$O[90](5096);
print ($lIx == $I8j[$O[90](5096)] ? $O[352](7651) : "");
$O[901](7651);
print $O[901](7651);
$O[1016](5096);
print $RdI[$O[1016](5096)];
$O[598](5096);
print $O[598](5096);
}
print " ";
}
$O[271](5096);
print $O[271](5096);
return NULL;
}
else
{
if( $I8j[$O[327](7651)] == $O[183](7651) )
{
$xb4 = $I8j[$O[183](7651)];
if( $xb4 )
{
$xb4($wjS, $I8j, $Sbx);
print $xb4($wjS, $I8j, $Sbx);
}
}
}
}
}
}
, 373, 154, function($x71) use (&$O)
{
$Bsd = array( 6357 => "min_user_password_length", 4683 => "\"/>", 3792 => "\"> <input type=hidden name=ureturn value=\"", 1462 => "~/[\\w\\d]+\\.php.*~", 9642 => "crate", 5952 => " to ", 261 => "last_pay_date", 5096 => "on", 7651 => "/_secret_key/", 845 => " from hm2_history group by user_id, ec", 1867 => "%.0", 1630 => "https://chart.googleapis.com/chart?chs=200x200&chld=M|0&cht=qr&chl=", 6323 => "Purse", 1591 => "recipient", 2607 => "last_withdrawals", 2429 => "Russian Federation", 7210 => "use_transaction_code", 4186 => "2 weeks" );
return $Bsd[$x71];
}
I have two questions from it:
What php format is this code?
How to convert it back into readable format?
Thanks in advance..