php-简单对称加密算法和字符串与十六进制之间的互转函数，php-十六进制

/**

* 简单对称加密算法之加密

* @param String $string 需要加密的字串

* @param String $skey 加密EKY

* @return String

*/

function encode($string = ”, $skey = ‘textphp’) {

$skey = str_split(base64_encode($skey));

$strArr = str_split(base64_encode($string));

$strCount = count($strArr);

foreach ($skey as $key => $value) {

$key < $strCount && $strArr[$key].=$value;

}

return str_replace(‘=’, ‘O0O0O’, join(”, $strArr));

}

/**

* 简单对称加密算法之解密

* @param String $string 需要解密的字串

* @param String $skey 解密KEY

* @return String

*/

function decode($string = ”, $skey = ‘textphp’) {

$skey = str_split(base64_encode($skey));

$strArr = str_split(str_replace(‘O0O0O’, ‘=’, $string), 2);

$strCount = count($strArr);

foreach ($skey as $key => $value) {

$key < $strCount && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];

}

return base64_decode(join(”, $strArr));

}

//字符串转换成16进制

function str2hex($str, $encoded = ‘GBK’) {

$hex = ”;

if ($encoded == ‘GBK’) {

$str = mb_convert_encoding($str, ‘GBK’, ‘UTF-8’);

}

for ($i = 0, $length = mb_strlen($str); $i < $length; $i++) {

$hex .= dechex(ord($str{$i}));

}

return $hex;

}

//16进制转换成字符串

function hex2str($hex, $encoded = ‘GBK’) {

$str = ”;

$arr = str_split($hex, 2);

foreach ($arr as $bit) {

$str .= chr(hexdec($bit));

}

if ($encoded == ‘GBK’) {

$str = mb_convert_encoding($str, ‘UTF-8’, ‘GBK’);

}

return $str;

}

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