Write a file to remote server with php ssh2

yii_ssh2_write_file.php

<?php
class ssh_test extends CWidget {

public function init() {
	$success = false;

	$sftp_host = '123.456.78.90';
	$sftp_port = '22';
	$sftp_fldr_prefix = '/var/www/';
	$sftp_fldr_location = 'base_dir/sub_dir/';

	$connection = ssh2_connect($sftp_host, $sftp_port);

	$usrn = 'username';
	$pw = 'password';

	if (ssh2_auth_password($connection , $usrn , $pw)){
		$success = true;
		$sftp = ssh2_sftp($connection);
		$upload_dir = 'ssh2.sftp://'.$sftp.$sftp_fldr_prefix.$sftp_fldr_location;


		// create new file at time.
		$file_name = 'test_'.date('Y-m-d_hms').'.txt';
		$file = $upload_dir.$file_name;

		$stream = fopen($file, 'w+');

		// change created file permissions
		ssh2_sftp_chmod($sftp, $sftp_fldr_prefix.$sftp_fldr_location.$file_name, 0755);

		// get contents of file (if any)
		$value = file_get_contents($file);

		// append to file
		$value .= 'Create test file at ('.date('Y-m-d h:m:s').').';

		// Write $value to our opened file.
		if (fwrite($stream, $value) === FALSE) {
			echo "Cannot write to file ($file)";
			exit;
		}

		// test if new value is actually written to file
		$value2 = file_get_contents($file);

	} else {
		// die('Public Key Authentication Failed');
		die('Authentication Failed');
	}

	fclose($stream);

	$view_url = 'http://'.$sftp_host.'/'.$sftp_fldr_location.$file_name;

	$this->render("_ssh_test", array(
		'success'=>$success,
		'value'=>$value2,
		'file_url'=>$view_url
		));
}
}

?>