php html_special_chars()

Do i need to have a library installed to use this function, i get an error (non-existent function call)
when i try to use it.
willsherwoodAsked:
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diaFCommented:
try without the underscores
just as htmlspecialchars()
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willsherwoodAuthor Commented:
perfect.   i had found references on the web with underscores. go figure.
thanks!
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