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How can PHP developers determine the expected size of data when using stdin for input streams?

When using stdin for input streams in PHP, developers can determine the expected size of data by checking the content length of the input stream. This can be done by using the `stream_get_meta_data()` function to retrieve the metadata of the stream, including the content length. By checking the content length, developers can ensure that the input data does not exceed the expected size.

php 
$stdin = fopen('php://stdin', 'r');
$streamMetaData = stream_get_meta_data($stdin);
$contentLength = $streamMetaData['unread_bytes'];

// Check if content length exceeds expected size
if ($contentLength > $expectedSize) {
    // Handle error or truncate data
}

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