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Only filter final output buffer in Optimization Detective #1317
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Update test-optimization.php
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This is based on @nextend's recommendation in WordPress/gutenberg#61212 (comment) feedback which is drafted in WordPress/gutenberg#62770. If a template calls
ob_clean()
at present, the output buffer being thrown away will be sent into the output buffer callback for needless processing even though it won't be served. This PR fixes addresses this issue by making sure the output buffer phase isPHP_OUTPUT_HANDLER_FINAL
.