1--TEST-- 2ob_start(): Ensure unerasable buffer cannot be flushed by ob_flush() 3--FILE-- 4<?php 5function callback($string) { 6 static $callback_invocations; 7 $callback_invocations++; 8 return "[callback:$callback_invocations]$string\n"; 9} 10 11ob_start('callback', 0, false); 12 13echo "Attempt to flush unerasable buffer - should fail... "; 14var_dump(ob_flush()); 15// Check content of buffer after flush - if flush failed it should still contain the string above. 16var_dump(ob_get_contents()); 17?> 18--EXPECTF-- 19[callback:1]Attempt to flush unerasable buffer - should fail... 20Notice: ob_flush(): failed to flush buffer of callback (0) in %s on line 11 21bool(false) 22string(%d) "Attempt to flush unerasable buffer - should fail... 23Notice: ob_flush(): failed to flush buffer of callback (0) in %s on line 11 24bool(false) 25" 26