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function encrypt_string($string)
{
    $output = false;
    /*
    * read security.ini file & get encryption_key | iv | encryption_mechanism value for generating encryption code
    */        

    $secret_key     = env('ENCRYPT_SECRET_KEY');
    $secret_iv      = env('ENCRYPT_SECRET_IV');
    $encrypt_method = env('ENCRYPT_METHOD');
    // hash
    $key    = hash("sha256", $secret_key);
    // iv – encrypt method AES-256-CBC expects 16 bytes – else you will get a warning
    $iv     = substr(hash("sha256", $secret_iv), 0, 16);
    //do the encryption given text/string/number
    $result = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
    $output = base64_encode($result);
    return $output;
}

function decrypt_string($string)
{
    $output = false;
    /*
    * read security.ini file & get encryption_key | iv | encryption_mechanism value for generating encryption code
    */
    $secret_key     = env('ENCRYPT_SECRET_KEY');
    $secret_iv      = env('ENCRYPT_SECRET_IV');
    $encrypt_method = env('ENCRYPT_METHOD');
    // hash
    $key    = hash("sha256", $secret_key);
    // iv – encrypt method AES-256-CBC expects 16 bytes – else you will get a warning
    $iv = substr(hash("sha256", $secret_iv), 0, 16);
    //do the decryption given text/string/number
    $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
    return $output;
}