This function tries to return a string with all HTML and
PHP tags stripped from a given
str. It errors on the side of caution in case of
incomplete or bogus tags. It uses the same tag stripping
state machine as the fgetss() function.
You can use the optional second parameter to specify
tags which should not be stripped.
注: allowable_tags was added in PHP 3.0.13 and PHP 4.0b3.
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