How to get the size of a temp stream in php?

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$tmpStream = tmpfile();  // Create a temporary stream

// Write some data to the stream
fwrite($tmpStream, "Hello, World!");
fwrite($tmpStream, "This is a test.");

// Get the current position within the stream
$position = ftell($tmpStream);

// Seek to the start of the stream
rewind($tmpStream);

// Get the file statistics using fstat()
$fileStats = fstat($tmpStream);

// Get the size of the stream using the file size from the stats and the position
$streamSize = $fileStats['size'] - $position;

// Output the size of the stream
echo "Size of the temp stream: " . $streamSize . " bytes";

// Close the temporary stream to clean up
fclose($tmpStream);