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Using an array to restrict search

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This is a snipet of code I have.  I eventually may want to increase this list to 10 words.  What am  I doing wong?

[code]$search = $_GET['search'];

$not_allowed = array('and', 'or', 'of', 'is', 'the');


if (stristr($search, $not_allowed))
        {
            echo 'Your search contains a word that is not allowed';
        }[/code]

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Try this:
[code]
<?php
$word_filter = array(
'and',
'or',
'of',
'is',
'the',
);

$search = $_GET['search'];

function has_bad_words($search)
{
global $word_filter;

$split = preg_split("#\s+#", $search, -1, PREG_SPLIT_NO_EMPTY);

if (is_array($split))
{
foreach ($split as $search_word)
{
if (in_array($search_word, $word_filter))
{
return true;
}
}
}

return false;
}

if (has_bad_words($search))
{
echo "Your search contains a word that is not allowed";
}
else
{
echo "success";
}
?>
[/code]

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or a simpler way is this.

[code=php:0]
$search = $_GET['search'];
$list = array('and', 'or', 'of', 'is', 'the');
foreach($list as $banned) {
  $match = strpos($search, $banned);
}
if ($match !== false) {
    echo "Your search contains banned words";
}
//continue your search
[/code]

Hope this helps,
Tom

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Thanks guys for your help.  I was still wondering if there is anything I can do with my existig code to make it work; particularly this line [code]if (stristr($search, $not_allowed))[/code] as I already have a complicated maze of nested loops and such.

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What about something like this:
[code]if (in_array(stristr($search, $blocked)))[/code] Could this work with some modification?

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if you are meaning that last code that you posted, it would be like this.

[code=php:0]
if (in_array(stristr($search, $blocked))) {
  //echo something
}else{
  //do something else
[/code]

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