php删除数组中的空值或指定值操作

$arr= array(array(),array(),array());
$str = implode(',',$arr);

if(empty($str)) echo "空";
else echo "非空";

$arr= array("","","");
echo count($arr);

$arr= array("","","");
if(empty($arr)) echo "空";
else echo "非空";

function array_remove_key($array, $keys)
{
$num = count($keys);
$num_last = $num - 1;
$this_array_0 = &$array;
$last_key = $keys[$num_last];
for ($i = 0; $i < $num_last; $i++)
{
$this_key = $keys[$i];
$this_var_name = 'this_array_' . $i;
$next_var_name = 'this_array_' . ($i + 1);
if (!array_key_exists($this_key, $$this_var_name)) {
break;
}
$$next_var_name = &${$this_var_name}[$this_key];
}
unset(${$next_var_name}[$last_key]);
return $array;
}