PHP encryption decryption class instance code _php instance

The

key code looks like this:

<?php function I_array_column ($input, $columnKey, $indexKey =null) {if (!function_exists (' Array_column ')) {$
Columnkeyisnumber = (Is_numeric ($columnKey)) True:false;
$indexKeyIsNull = (Is_null ($indexKey)) True:false;
$indexKeyIsNumber = (Is_numeric ($indexKey)) True:false;
$result = Array (); foreach (array) $input as $key => $row) {if ($columnKeyIsNumber) {$tmp = Array_slice ($row, $columnKey, 1); $tmp = (is_
Array ($tmp) &&!empty ($tmp))? Current ($TMP): null; }else{$tmp = isset ($row [$columnKey])? $row [$columnKey]:null;} if (! $indexKeyIsNull) {if ($indexKeyIsNumber) {$key =
Array_slice ($row, $indexKey, 1);
$key = (Is_array ($key) &&!empty ($key))? Current ($key): null;
$key = is_null ($key) 0: $key;
}else{$key = isset ($row [$indexKey])? $row [$indexKey]:0;}}
$result [$key] = $tmp;
return $result;
}else{return Array_column ($input, $columnKey, $indexKey);} function Randcode ($len, $mode = 2) {$rcode = '; switch ($mode) {Case 1://Remove easily confusing characters such as 0, O, O, l, etc. $chars = ' abcdefghjklmnpqrstuvwx YZ23456789abcdefghijkmnpqrstuvwxyz ';
Break
Case 2://Pure digital $chars = ' 0123456789 ';
Break
Case 3://Full number + uppercase and lowercase letters $chars = ' abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz ';
Break Case 4://Full number + uppercase and lowercase + some special characters $chars = ' abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz~!@#$%^&* () '
;
Break
$count = strlen ($chars)-1;
Mt_srand (Double) microtime () * 1000000);
for ($i = 0; $i < $len; $i + +) {$rcode. = $chars [Mt_rand (0, $count)];} return $rcode; }/** * $string plaintext or ciphertext * $operation encrypt encode or decrypt the decode * $key key * $expiry key validity */function Authcode ($string, $operation = ' DECODE ', $key = ', $expiry = 0) {$ckey _length = 4; $key = MD5 ($key); $keya = MD5 (substr ($key, 0,); $keyb = MD5 (Subs
TR ($key, 16, 16)); $KEYC = $ckey _length?
($operation = = ' DECODE ' substr ($string, 0, $ckey _length): substr (MD5 (Microtime ()),-$ckey _length)): ";
$cryptkey = $keya. MD5 ($keya. $KEYC);
$key _length = strlen ($cryptkey); $string = $operation = = ' DECODE '? Base64_decode (substr ($string, $ckEy_length): sprintf ('%010d ', $expiry? $expiry + Time (): 0). substr (MD5 ($string. $keyb), 0). $string;
$string _length = strlen ($string);
$result = ';
$box = Range (0, 255);
$rndkey = Array ();
for ($i = 0; $i <= 255 $i + +) {$rndkey [$i] = Ord ($cryptkey [$i% $key _length]);} for ($j = $i = 0; $i < 256; $i + +) {
$j = ($j + $box [$i] + $rndkey [$i])% 256;
$tmp = $box [$i];
$box [$i] = $box [$j];
$box [$j] = $tmp;
for ($a = $j = $i = 0; $i < $string _length $i + +) {$a = ($a + 1)% 256; $j = ($j + $box [$a])% 256; $tmp = $box [$a];
$box [$a] = $box [$j];
$box [$j] = $tmp;
$result. = Chr (ord ($string [$i]) ^ ($box [($box [$a] + $box [$j])% 256]); } if ($operation = = ' DECODE ') {if (substr ($result, 0,) = 0 | | substr ($result, 0)-time () > 0) && subst  R ($result) = = substr (MD5 (substr ($result,). $keyb), 0) {return substr ($result);} else {return ';}} else {return $KEYC. Str_replace (' = ', ', Base64_encode ($result));}

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