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leon@svn.wikimedia.org wrote:

• * Is this a subpage?
  

• * @return bool
  

• * @access public
  

• */
  

• function isSubpage() {

• global $wgNamespacesWithSubpages;
  

• return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
  

• }

$wgNamespacesWithSubpages is sparse; that is, not all namespaces will necessarily be listed in it.

The check as written will produce an E_NOTICE-level warning when called on a page containing a slash whose namespace is not listed explicitly in $wgNamespacesWithSubpages.

- -- brion vibber (brion @ pobox.com)