$sftp variable holds an SSH2 SFTP resource, so you can't just concat it as you do in your code when you call
According to the PHP documentation you'll need to get the intval of your SSH2 SFTP resource when calling
fopen("ssh2.sftp://" . intval($sftp) . "/DossierTest/$file_name", "w");
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
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