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<?php // Fiddle in response to StackOverflow question: https://stackoverflow.com/questions/69845122 // by HappyDog // According to the PHP documentation, returning false from an output-buffer // callback should result in the same result as returning the original input, // but this fiddle shows that returning false actually breaks the buffer if it // is 'cleaned'. The solution is to always return a string value. ////////////////////////////// // CALLBACKS // Returns false, which means 'use the buffer as supplied'. function ReturnFalse($Buffer, $Phase) { global $arrCallbacks; $arrCallbacks[] = array($Buffer, $Phase); return false; } // Returns the supplied buffer - result should be identical to returning false. function ReturnBuffer($Buffer, $Phase) { global $arrCallbacks; $arrCallbacks[] = array($Buffer, $Phase); return $Buffer; } ////////////////////////////// // TESTING CODE foreach (array("ReturnFalse", "ReturnBuffer") as $Callback) { $arrCallbacks = array(); print("== Testing " . $Callback . " ===\n"); ob_start($Callback); print("First\n"); ob_clean(); print("Second\n"); ob_end_flush(); print("\n"); var_dump($arrCallbacks); }