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Update this blog's 'public' setting in the global blogs table.
Public blogs have a setting of 1, private blogs are 0.
<code style="color: #000000"><span style="color: #0000BB"><?php update_blog_public</span><span style="color: #007700">( </span><span style="color: #0000BB">$unused</span><span style="color: #007700">, </span><span style="color: #0000BB">$value </span><span style="color: #007700">); </span><span style="color: #0000BB">?></span></code>
update_blog_public() is located in wp-includes/ms-functions.php