case sensitivity

[Tandem]

Hi, on my site i want to try and stop users from inputting a certain phrase i.e their own username, into a particualr form input. However users can get around what i have put in place by inputting their username in a different case or combination of cases. What would be the best way to detect whether they have input the particular word, in any case?

[redarrow]

eregi

[AndyB]

.. or convert their input to all the same case using either strtolower() or strtoupper()

[Jenk]

eregi is deprecated, use preg_* functions instead.

Otherwise use stri* functions for direct matches:
[code]<?php

$string = 'FoO';

if (stripos($string, 'foo') !== false) {
    //case insentivie match for foo found
}

if (preg_match('/foo/i', $string)) {
    //case insensitive match for foo found
}

?>[/code][/code]