PHP：如何使用Array_filter()來過濾數(shù)組鍵？中的回調(diào)函數(shù)array_filter()只傳遞數(shù)組的值，而不是鍵。如果我有：$my_array = array("foo" => 1, "hello" => "world");$allowed = array("foo", "bar");刪除所有鍵的最佳方法是什么$my_array不在$allowed陣列？期望產(chǎn)出：$my_array = array("foo" => 1);
3 回答
胡子哥哥
TA貢獻1825條經(jīng)驗 獲得超6個贊
array_filter(), flagARRAY_FILTER_USE_KEY
$my_array = ['foo' => 1, 'hello' => 'world'];$allowed = ['foo', 'bar'];$filtered = array_filter(
$my_array,
function ($key) use ($allowed) {
return in_array($key, $allowed);
},
ARRAY_FILTER_USE_KEY);array_intersect_key($my_array, array_flip($allowed))$allowed
ARRAY_FILTER_USE_BOTH$allowed
$my_array = ['foo' => 1, 'bar' => 'baz', 'hello' => 'wld'];$allowed = ['foo' => true, 'bar' => true, 'hello' => 'world'];$filtered = array_filter(
$my_array,
function ($val, $key) use ($allowed) { // N.b. $val, $key not $key, $val
return isset($allowed[$key]) && (
$allowed[$key] === true || $allowed[$key] === $val );
},
ARRAY_FILTER_USE_BOTH); // ['foo' => 1, 'bar' => 'baz']
慕斯王
TA貢獻1864條經(jīng)驗 獲得超2個贊
array_intersect_keyarray_flip:
var_dump(array_intersect_key($my_array, array_flip($allowed)));array(1) {
["foo"]=>
int(1)}
隔江千里
TA貢獻1906條經(jīng)驗 獲得超10個贊
array_filter
// Filter out array elements with keys shorter than 4 characters$a = array(
0 => "val 0",
"one" => "val one",
"two" => "val two",
"three"=> "val three",
"four" => "val four",
"five" => "val five",
"6" => "val 6"); $f = array_filter(array_keys($a), function ($k){ return strlen($k)>=4; }); $b = array_intersect_key($a, array_flip($f));print_r($b);Array( [three] => val three [four] => val four [five] => val five)
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