remove .*& from string

i wan to remove all the *&^@%^#.... from a string, just want to keep the letters and number.
eg:
$str="test#@dd_22345(eer)..";
i want it to be :
"testdd22345eer"
hope it's easy to understand,
thanks

 

$new_str = ereg_replace("[^A-Za-z0-9]", "", $str);

PHP:

 

$str="test#@dd_22345(eer)..";
$symbols = array("*","&","^","@","%","^","#");
$str = str_replace($symbols,"",$str);

PHP:

if there are additional symbols you want to filter add them to the $symbols array

 

Thank you for them, it's works