Description:
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Faulty implementation within php_ssh2_fopen_wraper_parse_path function (ssh2_fopen_wrappers.c) makes it impossible to open files containing # within the file name via sftp.

Comment included in lines 221-224 suggests that fragment and query are included within the path. resource->path does not include this information, fragment and query are stripped, therefore usage of # is not possible,

Test script:
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$connection=ssh2_connect($host, $port);
ssh2_auth_password($connection, $username, $password);
$sftp = ssh2_sftp($connection);
$remote_file = '/SomePath/SomeFile_#.csv';
$stream = fopen("ssh2.sftp://$sftp".$remote_file, 'r');