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Home Backend Development PHP Tutorial PHP开发接口响应数据null怎么过滤?

PHP开发接口响应数据null怎么过滤?

Jun 06, 2016 pm 08:09 PM
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响应的数据可能是一维的数组,也可能二维的数组,再json_encode之前,怎么过滤null?

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响应的数据可能是一维的数组,也可能二维的数组,再json_encode之前,怎么过滤null?

array_filter是只能去除掉一维的数组的null

<code>function null_filter($arr)
{
    foreach($arr as $key=>&$val) {
        if(is_array($val)) {
            $val = null_filter($val);
        } else {
            if($val === null){
                unset($arr[$key]);
            }
        }
    }
    return $arr;
}</code>
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有现成的函数,默认可以过滤掉所有 ""、null、false
如果单独只需要过滤掉null,那么类似如下代码写一个回调函数

<code>function delete_null($vo){
    if ($vo==null){
        return false;
    }
    return true;
}
print_r(array_filter(array("aaa","bbb",null,"ccc"),"delete_null"));</code>
Copy after login

直接array_filter就可以了吧

array_filter其实只能过滤一组数组,但是从数据库获取的多数是二维,所以这个还是要自己写一个函数,可以递归实现。

最好的办法是和开发API的兄弟商量一下,别返回null 返回''也比它强,

<code>$data= \str_replace(':null', ':""', json_encode($data));</code>
Copy after login

楼上说到array_filter,其实array_filter($arr,'strlen')这样过滤就可以,然后json_encode

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