Woocommerce中的IPN Paypal更改URL

<?php

/**
 * This is a PayPal IPN (Instant Payment Notification) broadcaster
 * Since PayPal does not provide any straightforward way to add
 * multiple IPN listeners we'll have to create a central IPN
 * listener that will broadcast (or filter and dispatch) Instant
 * Payment Notifications to different destinations (IPN listeners)
 *
 * Destination IPN listeners must not panic and recognize IPNs sent
 * by this central broadcast as valid ones in terms of source IP
 * and any other fingerprints. Any IP filtering must add this host,
 * other adjustments made as necessary.
 *
 * IPNs are logged into files for debugging and maintenance purposes
 *
 * this code comes with absolutely no warranty
 * https://codeseekah.com
 */

ini_set( 'max_execution_time', 0 ); /* Do not abort with timeouts */
ini_set( 'display_errors', 'Off' ); /* Do not display any errors to anyone */
$urls = array(); /* The broadcast session queue */

/* List of IPN listener points */
$ipns = array(
    'mystore' => 'http://mystore.com/ipn.php',
    'myotherstore' => 'http://mybigstore.com/paypal_ipn.php',
    'myotherandbetterstore' => 'http://slickstore.com/paypal/ipn.php'
);

/* Fingerprints */

if ( /* My Store IPN Fingerprint */
    preg_match( '#^\d+\|[a-f0-9]{32}$#', $_POST['custom'] ) /* Custom hash */
    and $_POST['num_cart_items'] == 2 /* alwayst 1 item in cart */
    and strpos( $_POST['item_name1'], 'MySite.com Product' ) == 0 /* First item name */
) $urls []= $ipns['mystore']; /* Choose this IPN URL if all conditions have been met */

if ( /* My Other Store IPN Fingerprint */
    sizeof( explode('_', $_POST['custom']) ) == 7 /* has 7 custom pieces */
) $urls []= $ipns['myotherstore']; /* Choose this IPN URL if all conditions have been met */

/* My Other And Better Store IPN Fingerprint */
$custom = explode('|', $_POST['custom']);
if (
    isset($custom[2]) and $custom[2] == 'FROM_OB_STORE' /* custom prefixes */
) $urls []= $ipns['myotherandbetterstore']; /* Choose this IPN URL if all conditions have been met */

/* ... */


/* Broadcast */

if ( !sizeof($urls) ) $urls = $ipns; /* No URLs have been matched */
$urls = array_unique( $urls ); /* Unique, just in case */

/* Broadcast (excluding IPNs from the list according to filter is possible */
foreach ( $urls as $url ) broadcast( $url );

header( 'HTTP/1.1 200 OK', true, 200 );
exit(); /* Thank you, bye */

/* Perform a simple cURL-powered proxy request to broadcast */
function broadcast( $url ) {

    /* Format POST data accordingly */
    $data = array();
    foreach ($_POST as $key => $value) $data []= urlencode($key).'='.urlencode($value);
    $data = implode('&', $data);

    /* Log the broadcast */
    file_put_contents('_logs/'.time().'.'.reverse_lookup( $url ).'-'.rand(1,100), $data);

    $ch = curl_init(); /* Initialize */

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, count($data));
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    curl_exec($ch); /* Execute HTTP request */

    curl_close($ch); /* Close */
}

function reverse_lookup( $url ) {
    global $ipns;
    foreach ( $ipns as $tag => $_url ) {
        if ( $url == $_url ) return $tag;
    }
    return 'unknown';
}
?>