php - Initializing sftp subsystem via libssh2 -

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i trying file remote sftp server in php script. i'm using libssh2 library ani have been able 1) open connection ssh server , 2) authenticate properly. i'm hitting wall on creating sftp resource use ssh2_sftp* functions , wrapper. following line leaves $sftp null:

      $stfp = ssh2_sftp($ftp_conn);

php error log shows no errors. ssh server logs show successful login, authentication, , log sftp subsytem being initialized. ideas on next?


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