string comparison in php

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hi

i am writing a small application where a user enters a phrase in the
textfield and i would like to display all the files present in the
root directory which consists of the keyword or keywords entered by
the user.

i have used a few comparison functions but i am not getting the
expected result.

$my_file = file_get_contents("filename.html");
what ever the user enters whether it is a single word or few words i
would like to compare with $my_file in a case insensitive manner.

can anyone suggest the best method and how to go about.

thanks.



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