php - codeigniter append [removed] message while stripping tags -

i using codeigniter 2.1.4,

if add

>  hello world <script>alert('hi')</script>

in inputbox.

while processing value codeigniter adding [removed] text.the output

hello world[removed]alert('hi');[removed]

i think should use strip_tags function php

echo strip_tags("<b>foo</b>");

results in: foo , in case output of

echo strip_tags("hello world <script>alert('hi')</script>");

results in: hello world alert('hi')

Ben