PHP filter function against SQL injections

["Kellox" <kellox () mymail ch>]

hi everyone!

i was just wondering if this filter function written in php is safe against
sql injections:

function filter($string) {
  $replace = "";
  $search = array(">", "<", "|", ";");
  $result = mysql_escape_string( str_replace($search, $replace, $string));
  return $result;
}

or could anyone imagine an sql injection attack which bypasses this filter
function?
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