Cytat
flags
For all versions prior to PHP 6, this parameter is called use_include_path and is a bool. The flags parameter is only available since PHP 6. If you use an older version and want to search for filename in the include path, this parameter must be TRUE. Since PHP 6, you have to use the FILE_USE_INCLUDE_PATH flag instead.
Cytat
context
A valid context resource created with stream_context_create(). If you don't need to use a custom context, you can skip this parameter by NULL.
Zatem, normalnie
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