/* * Patch for filter_var() */ if(!function_exists('filter_var')){ define('FILTER_VALIDATE_IP', 'ip'); define('FILTER_FLAG_IPV4', 'ipv4'); define('FILTER_FLAG_IPV6', 'ipv6'); define('FILTER_VALIDATE_EMAIL', 'email'); define('FILTER_FLAG_EMAIL_UNICODE', 'unicode'); function filter_var($variable, $filter, $option = false){ if($filter == 'ip'){ if($option == 'ipv4'){ if(preg_match("/(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/", $variable, $matches)){ $variable = $matches[1]; return $variable; } } if($option == 'ipv6'){ if(preg_match("/\s*(([:.]{0,7}[0-9a-fA-F]{0,4}){1,8})\s*/", $variable, $matches)){ $variable = $matches[1]; return $variable; } } } if($filter == 'email'){ if($option == 'unicode' || $option == false){ if(preg_match("/\s*(\S*@\S*\.\S*)\s*/", $variable, $matches)){ $variable = $matches[1]; return $variable; } } } } }
I think plastic is more of a symbol, like a canary in a coal mine. It's by far not as dangerous as what you mentioned or nuclear waste but since it floats to the top, everybody notices it.Plastics, unlike the other substances mentioned, cannot dissolve into the vast amounts of water in the world's oceans. By contrast, there has always been some heavily diluted (natural) uranium in the world's oceans but this is meaningless given that the human body has always had quite harmless tiny trace amounts of uranium even in preindustrial times. Obviously, if as time goes on, the chemical pollution increases to the point where dilution in the oceans is not enough, then there will be a problem, but not yet.