从数组中删除空白的元素(包括只有空白字符的元素)
/**
*
*
* @param array $arr
* @param boolean $trim
*/
function delete_empty(& $arr, $trim = true)
{
foreach ($arr as $key => $value) {
if (is_array($value)) {
delete_empty($arr[$key]);
} else {
$value = trim($value);
if ($value == '') {
unset($arr[$key]);
} elseif ($trim) {
$arr[$key] = $value;
}
}
}
}

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