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Version 6.24 of taxonomy.module uses clone in line 891. That's not allowed in PHP4 which Drupal 6 still supports. In D6 there is drupal_clone() for cloning.
Comments
Comment #1
Heine CreditAttribution: Heine commentedIntroduced in #556842: taxonomy_get_tree() memory issues.
Comment #2
mdupontConfirmed, still here in 6.x-dev.