What are the potential issues with using strlen to calculate Content-Length for UTF-8 strings in PHP?

When using strlen to calculate the Content-Length for UTF-8 strings in PHP, it may not give the accurate byte count due to the multi-byte nature of UTF-8 characters. To accurately calculate the byte count for UTF-8 strings, you should use mb_strlen with the '8bit' encoding parameter instead. 

// UTF-8 string
$utf8String = "Hello, 你好";

// Calculate the accurate byte count using mb_strlen with '8bit' encoding
$contentLength = mb_strlen($utf8String, '8bit');

// Output the Content-Length header
header('Content-Length: ' . $contentLength);

Keywords

strlen Content-Length UTF-8 strings issues

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