Warning: include_once(header.php): failed to open stream: No such file or directory in H:\Apache24\htdocs\test4\21\example21-12.php on line 2

Warning: include_once(): Failed opening 'header.php' for inclusion (include_path='.;C:\php\pear') in H:\Apache24\htdocs\test4\21\example21-12.php on line 2

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