duanjiao7440
duanjiao7440
2017-08-28 02:28
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已采纳

如何在PHP中获取数组值的子集?

Given:

$info = ['abc'=>'xyz', '123'=>'456', 'vowels'=>'aeiou'];  //complete data array
$keys = ['abc','123'];  //list of keys I'm interested in getting the VALUES for

What's the best way to get an array like this (no KEYS in it):

['xyz','456']

Currently, I have this, but feel there might be some other way with PHP's built-in array functions:

$result = [];

foreach ($keys as $key) {
    $result[] = $info[$key];
}

return $result;

Other answers describe a 'pluck' type function, but those all return keys too... I only want the values.

Update: The answer seems to be a combination of two responses below:

array_values(array_intersect_key($info,array_flip($keys)));
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1条回答 默认 最新

  • dopii22884
    dopii22884 2017-08-28 02:58
    已采纳

    Nothing particularly bad about your approach, but here are a couple of alternatives

    $info = ['abc'=>'xyz', '123'=>'456', 'vowels'=>'aeiou'];  //complete data array
    $keys = ['abc','123'];  //list of keys I'm interested in
    
    $out=array_intersect_key($info,array_flip($keys));
    
    print_r($out);
    

    Array ( [abc] => xyz [123] => 456 )

    OR

    $out= array_map(function($x) use ($info) { return $info[$x]; }, $keys);
    
    print_r($out);
    

    Array ( [0] => xyz [1] => 456 )

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