从 PHP 中的数组中删除黑名单键
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Remove blacklist keys from array in PHP
提问by hackartist
I have an associative array of data and I have an array of keys I would like to remove from that array (while keeping the remaining keys in original order -- not that this is likely to be a constraint).
我有一个关联的数据数组，并且我有一个我想从该数组中删除的键数组（同时保持其余键的原始顺序——这可能不是一个约束）。
I am looking for a one linerof php to do this.
I already know how I could loop through the arrays but it seems there should be some array_mapwith unsetor array_filtersolution just outside of my grasp.
我正在寻找一种单行php 来做到这一点。
我已经知道我怎么会通过数组循环，但它似乎应该有一些array_map用unset或array_filter解决方案外面我的把握。
I have searched around for a bit but found nothing too concise.
我已经搜索了一点，但没有找到太简洁的内容。
To be clear this is the problem to do in one line:
要清楚这是在一行中做的问题：
//have this example associative array of data
$data = array(
'blue' => 43,
'red' => 87,
'purple' => 130,
'green' => 12,
'yellow' => 31
);
//and this array of keys to remove
$bad_keys = array(
'purple',
'yellow'
);
//some one liner here and then $data will only have the keys blue, red, green
回答by Niet the Dark Absol
$out =array_diff_key($data,array_flip($bad_keys));
$out =array_diff_key($data,array_flip($bad_keys));
All I did was look through the list of Array functionsuntil I found the one I needed (_diff_key).
回答by Pmpr
The solution is indeed the one provided by Niet the Dark Absol. I would like to provide another similar solution for anyone who is after similar thing, but this one uses a whitelistinstead of a blacklist:
解决办法确实是黑暗阿布索涅特提供的解决方案。我想为任何追求类似事情的人提供另一种类似的解决方案，但这个解决方案使用白名单而不是黑名单：
$whitelist = array( 'good_key1', 'good_key2', ... );
$output = array_intersect_key( $data, array_flip( $whitelist ) );
Which will preserve keys from $whitelistarray and remove the rest.
这将保留$whitelist数组中的键并删除其余键。
回答by TarranJones
This is a blacklisting function I created for associative arrays.
这是我为关联数组创建的黑名单函数。
if(!function_exists('array_blacklist_assoc')){
/**
* Returns an array containing all the entries from array1 whose keys are not present in any of the other arrays when using their values as keys.
* @param array $array1 The array to compare from
* @param array $array2 The array to compare against
* @return array $array2,... More arrays to compare against
*/
function array_blacklist_assoc(Array $array1, Array $array2) {
if(func_num_args() > 2){
$args = func_get_args();
array_shift($args);
$array2 = call_user_func_array('array_merge', $args);
}
return array_diff_key($array1, array_flip($array2));
}
}
$sanitized_data = array_blacklist_assoc($data, $bad_keys);
