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--TEST-- Test basic functionality of flush() --FILE-- <?php /* * proto void flush(void) * Function is implemented in ext/standard/basic_functions.c. */ // Verify return type var_dump(flush()); // Ensure user buffers are not flushed by flush() ob_start(); echo "Inside a user buffer\n"; flush(); ob_end_clean(); echo "Outside of any user buffers\n"; var_dump(flush()); ?> --EXPECT-- NULL Outside of any user buffers NULL