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function decrypt($code,$key) 
{ 
    define('SALT', $key); 
    $Decrypted =  trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, 
    SALT, base64_decode($code), MCRYPT_MODE_ECB, 
    mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), 
    MCRYPT_RAND))); 
    return $Decrypted;
} 
  
function encrypt($key,$id) 
{ 
       define('SALT', $key); 
    $Encrypted = trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, 
    SALT, $id, MCRYPT_MODE_ECB, 
    mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), 
    MCRYPT_RAND)))); 
    return $Encrypted;
}