Description:
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From manual page: http://www.php.net/function.stripos
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Stripos returns eiter an integer or boolean, just like strpos. While strpos claims to return "mixed," stripos claims to return an integer. It is a little inconsistency which should be perhaps corrected so that same return values both have an equivalent return type in the documentation. 


Test script:
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mixed strpos ( string $haystack , mixed $needle [, int $offset = 0 ] )