Filter special characters

[NoobPHP]

Is there any way where i can filter special characters like
such as
,./<>?;:'"[]{}-!@#$%^&*()_+

$Keyword = (isset($_GET['Keyword'])) ? $_GET['Keyword'] : '';
$trimmedKeyword = trim($Keyword);
$trimmedKeyword = stripslashes($trimmedKeyword);
$trimmedKeyword = str_replace('"', '', $trimmedKeyword);
//trim whitespace from the stored variable
$trimmedKeyword = preg_replace('#\s+#',' ',$trimmedKeyword);
$trimmed_arrayKeyword = explode(" ",$trimmedKeyword);

[mrhappiness]

put them into an array and use [man]str_replace[/man]

[NoobPHP]

Thanks ..

Ok i used the array method

$filter = array("!", "@", "#", "$", "%", "^", "&", "", "", "(");
$trimmedKeyword = str_replace($filter, "", "$trimmedKeyword");

but i was unable to filter these two characters

\ and "

why is it so?

Another thing is if i were to type Crack !@#$

how should i display only Crack without !@#$ when i echo the value

<? echo $keyword; ?>

$Keyword = (isset($_GET['Keyword'])) ? $_GET['Keyword'] : '';
$trimmedKeyword = trim($Keyword);
$trimmedKeyword = stripslashes($trimmedKeyword);
$trimmedKeyword = str_replace('"', '', $trimmedKeyword);
//trim whitespace from the stored variable
$trimmedKeyword = preg_replace('#\s+#',' ',$trimmedKeyword);
$trimmed_arrayKeyword = explode(" ",$trimmedKeyword);

[Weedpacket]

1) If you look up what the manual says about strings you'll see that " and \ have special meanings. So if you want them to be treated literally, they need to be escaped with \ (that's \'s special meaning). So it's not """ and "\", it's "\"" and "\"

2) Remove the unwanted characters and then display what's left.