PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8
fflush - Flushes the output to a file
fflush( resource$stream ): bool
This function forces a write of all buffered output to the resource pointed to by the file stream.
The file pointer must be valid, and must point to a file successfully opened by fopen or fsockopen (and not yet closed by fclose).
Returns true on success or false on failure.
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