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Get the size of a directory recursively.
Used by get_dirsize() to get a directory's size when it contains other directories.
<code style="color: #000000"><span style="color: #0000BB"><?php recurse_dirsize</span><span style="color: #007700">( </span><span style="color: #0000BB">$directory </span><span style="color: #007700">); </span><span style="color: #0000BB">?></span></code>
Since: MU
recurse_dirsize() is located in wp-includes/ms-functions.php