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wfResetOutputBuffers() is broken on PHP 5.6
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Somewhere between 5.3 and 5.6, PHP started considering the default output buffer handler (the one you get from ob_start() or ob_start( null )) as "internal" rather than "user".

This is similar to the HHVM bug behind T89918 (upstream 4868), and so would likely have similar effects for someone running MediaWiki on modern PHP rather than HHVM.