(PHP 4 >= 4.0.2, PHP 5, PHP 7)
ob_get_length — Return the length of the output buffer
ob_get_length ( ) : int
This will return the length of the contents in the output buffer, in bytes.
Returns the length of the output buffer contents, in bytes, or false
if no buffering is active.
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https://www.php.net/manual/en/function.ob-get-length.php