Separate PHP processes using same ssh2.sftp resource - php

Question

I am using the PECL ssh2 module to output XML data to a sftp server. I have two entirely separate PHP scripts which gather different data and send the output to different file on the stfp server.
CUSTOMER EXPORT:
$conn = ssh2_connect(SFTP_SERVER, SFTP_PORT);
ssh2_auth_password($conn, SFTP_USER, SFTP_PWD);
$sftp = ssh2_sftp($conn);
$file = 'ssh2.sftp://' . $sftp . CUSTOMER_EXPORT_PATH . CUSTOMER_EXPORT_FILENAME;
$doc = new DOMDocument('1.0','UTF-8');
CustomerExportXML($doc);
if (file_exists($file)) {
unlink($file);
}
$bytes_saved = $doc->save($file);
PRODUCT EXPORT:
$conn = ssh2_connect(SFTP_SERVER, SFTP_PORT);
ssh2_auth_password($conn, SFTP_USER, SFTP_PWD);
$sftp = ssh2_sftp($conn);
$file = 'ssh2.sftp://' . $sftp . PRODUCT_EXPORT_PATH . PRODUCT_EXPORT_FILENAME;
$doc = new DOMDocument('1.0','UTF-8');
ProductExportXML($doc);
if (file_exists($file)) {
unlink($file);
}
$bytes_saved = $doc->save($file);
In each case the XxxExportXML($doc) function takes a couple of minutes to gather the relevant data and stuff it in to $doc.
Each script works as is and exports the correct data to the correct place.
The problem is when their execution overlaps only the last one executed actually writes to the sftp server. If I echo out the $file variable then in each case they both have the same resource ID ie ssh2.sftp://ResourceID#150/Customer/Customer.xml and ssh2.sftp://ResourceID#150/Product/Product.xml
So my question is why are these two processes interfering with each other and how do I fix it so they can both be run at the same time?

Answer 1

So they're two different scripts? That's... weird. Maybe try phpseclib, a pure PHP SFTP implementation, instead. eg.
<?php
include('Net/SFTP.php');
$sftp = new Net_SFTP('www.domain.tld');
if (!$sftp->login('username', 'password')) {
exit('Login Failed');
}
// puts a three-byte file named filename.remote on the SFTP server
$sftp->put('filename.remote', 'xxx');