PHP實現簡單的對稱加密和解密方法

/**


通用加密
@param String $string 需要加密的字串
@param String $skey 加密EKY
@return String
*/
function enCode($string = '', $skey = 'echounion') {
 $skey = array_reverse(str_split($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));
}

/**

通用解密
@param String $string 需要解密的字串
@param String $skey 解密KEY
@return String
*/
function deCode($string = '', $skey = 'echounion') {
 $skey = array_reverse(str_split($skey));
 $strArr = str_split(str_replace('O0O0O', '=', $string), 2);
 $strCount = count($strArr);
 foreach ($skey as $key => $value) {
 $key < $strCount && $strArr[$key] = rtrim($strArr[$key], $value);

 }
 return base64_decode(join('', $strArr));
}</pre>