php - 使用 array_filter 时意外的 php 通知和警告

Question

我得到以下信息

Notice: Use of undefined constant ARRAY_FILTER_USE_BOTH - assumed 'ARRAY_FILTER_USE_BOTH' in C:\projects\yada.php on line 88

Warning: array_filter() expects at most 2 parameters, 3 given in C:\projects\yada.php on line 88

Notice: Use of undefined constant ARRAY_FILTER_USE_BOTH - assumed 'ARRAY_FILTER_USE_BOTH' in C:\projects\yada.php on line 91

Warning: array_filter() expects at most 2 parameters, 3 given in C:\projects\yada.php on line 91

代码如下

$unregistered_team_names = array_filter($data, function ($v, $k) {
    return strpos($k, 'unregistered_user_name_') !== false;
}, ARRAY_FILTER_USE_BOTH);
$unregistered_team_emails = array_filter($data, function ($v, $k) {
    return strpos($k, 'unregistered_user_email_') !== false;
}, ARRAY_FILTER_USE_BOTH);

根据此处提供的文档，代码似乎有效 - http://php.net/manual/en/function.array-filter.php

永远不会调用回调。

Answer 1

根据 changelog array_filter 手册部分:

5.6.0 Added optional flag parameter and constants ARRAY_FILTER_USE_KEY and ARRAY_FILTER_USE_BOTH

所以，答案是:您的 php 版本低于5.6。