PHP Cryptographic decryption class instance code _php instance

The key code is as follows:

<?phpfunction 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 0, O, O, L, etc. easily confusing characters $chars = ' Abcdefghjklmnpqrstuvwxyz23456789abcdefghijkmnpqrstuvwxyz '; BreaK;case 2://Pure digital $chars = ' 0123456789 '; Break;case 3://full digit + uppercase letter $chars = ' Abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz '; Break;case 4://full digit + uppercase letter + some special characters $chars = ' abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz~!@#$%^&* () '; break;} $count = strlen ($chars)-1;mt_srand ((double) microtime () * 1000000); for ($i = 0; $i < $len; $i + +) {$rcode. = $chars [Mt_r and (0, $count)];} return $rcode;} /*** $string Clear Text or ciphertext * $operation encrypt encode or decrypt decode* $key key * $expiry key validity period */function Authcode ($string, $operation = ' DECODE '  , $key = ", $expiry = 0) {$ckey _length = 4; $key = MD5 ($key); $keya = MD5 (substr ($key, 0, +)); $keyb = MD5 (substr ($key, 16, ); $KEYC = $ckey _length? ($operation = = ' DECODE '? substr ($string, 0, $ckey _length): substr (MD5 (Microtime ()),-$ckey _length)): "; $cryptkey = $key A.MD5 ($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 < $i + +) {$j = ($j + $box [$i] + $rndkey [$i])%, $tmp = $box [$i]; $box [$i] = $box [$j]; $box [$j] = $tmp;} for ($a = $j = $i = 0; $i < $string _length; $i + +) {$a = ($a + 1)%, $j = ($j + $box [$a])%, $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, ten) = = 0 | | substr ($result, 0,)-time () > 0) && substr ($ result, (+) = = substr (MD5 ($result, 0)) {return substr ($result, +),} else {return ';}} else {return $KEYC. Str_replace (' = ', ' ', Base64_encode ($result));}}

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