Encrypt and decrypt PHP cryptographic decryption class

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 0, O, O, L and other 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_rand (0, $count)];
}
return $rcode;
}
/**
* $string Clear text or ciphertext
* $operation encrypt encode or decrypt decode
* $key Key
* $expiry Key Expiration date
*/
function Authcode ($string, $operation = ' DECODE ', $key = ", $expiry = 0) {
$ckey _length = 4;
$key = MD5 ($key);
$keya = MD5 (substr ($key, 0, 16));
$KEYB = MD5 (substr ($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 < $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, ten) = = 0 | | substr ($result, 0,)-time () > 0) && substr ($result, ten, +) = = SUBSTR (MD 5 (substr ($result, +). $keyb), 0, 16)) {
Return substr ($result, 26);
} else {
Return ';
}
} else {
Return $KEYC. Str_replace (' = ', ' ', Base64_encode ($result));
}
}

The above describes the encryption and decryption of PHP encryption and decryption classes, including the content of encryption and decryption, I hope that the PHP tutorial interested in a friend helpful.

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