类似explode, 但不分割指定符号内的字符.

/**
 * 类似explode, 但不分割指定符号内的字符.
 * @param string $str
 * @param string $pattern 匹配指定符号内的正则
 * @param string $replacement 暂时替换成的字符串
 * @return array $data 分割之后的数组
 */
function str2arr($str, $pattern='/\((.*)\)/U', $replacement='()'){
	$data = array();
	$str = preg_replace('/\s+/', ' ', $str); //去多余空格
	preg_match_all($pattern, $str, $matches); // print_r($matches);
	$data = explode(' ', preg_replace($pattern, $replacement, $str));
	foreach($data as $key=>$val){
		if($val==$replacement){
			$data[$key] = array_shift($matches[1]);
		}
	}
	return $data;
}

$str = 'Html    Form    (Acl Auth) Help  component paginator collection (session cookie hash) result';
echo "<pre>";
print_r(str2arr($str));
/*
Array
(
    [0] => Html
    [1] => Form
    [2] => Acl Auth
    [3] => Help
    [4] => component
    [5] => paginator
    [6] => collection
    [7] => session cookie hash
    [8] => result
)
*/