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php

    1: --TEST--
    2: ob_start(): Ensure unerasable buffer cannot be erased by ob_clean(), ob_end_clean() or ob_end_flush().
    3: --FILE--
    4: <?php
    5: function callback($string) {
    6: 	static $callback_invocations;
    7: 	$callback_invocations++;
    8: 	return "[callback:$callback_invocations]$string\n";
    9: }
   10: 
   11: ob_start('callback', 0, false);
   12: 
   13: echo "All of the following calls will fail to clean/remove the topmost buffer:\n";
   14: var_dump(ob_clean());
   15: var_dump(ob_end_clean());
   16: var_dump(ob_end_flush());
   17: 
   18: echo "The OB nesting will still be 1 level deep:\n";
   19: var_dump(ob_get_level());
   20: ?>
   21: --EXPECTF--
   22: [callback:1]All of the following calls will fail to clean/remove the topmost buffer:
   23: 
   24: Notice: ob_clean(): failed to delete buffer callback in %s on line 11
   25: bool(false)
   26: 
   27: Notice: ob_end_clean(): failed to delete buffer callback in %s on line 12
   28: bool(false)
   29: 
   30: Notice: ob_end_flush(): failed to delete buffer callback in %s on line 13
   31: bool(false)
   32: The OB nesting will still be 1 level deep:
   33: int(1)