<?php
    $private_key = "-----BEGIN RSA PRIVATE KEY-----
        MIICXAIBAAKBgQDFG/lh1FLEVF8J0AwZZvUQkISjS1m/nHRp3ZSgqH7C2O62ZBVn
    -----END RSA PRIVATE KEY-----";
    $ad_from = "111";
    $ids = "2202409872";
    $pi_key =  openssl_pkey_get_private($private_key);
    $str = "ad_from={$ad_from}&ids=[{$ids}]";
    //sign
    openssl_sign($str, $signature, $pi_key);
    $encrypted = base64_encode($signature);
    $encrypted = urlencode($encrypted);
    echo $encrypted;
?>