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array_fill_keys

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

array_fill_keysキーを指定して、配列を値で埋める

説明

array_fill_keys(array $keys, mixed $value): array

パラメータ value で指定した値で配列を埋めます。 キーとして、配列 keys で指定した値を使用します。

パラメータ

keys

キーとして使用する値の配列。キーとして無効な値は string に変換されます。

value

埋めたい値。

戻り値

値を埋めた配列を返します。

例1 array_fill_keys() の例

<?php
$keys
= array('foo', 5, 10, 'bar');
$a = array_fill_keys($keys, 'banana');
print_r($a);
?>

上の例の出力は以下となります。

Array
(
    [foo] => banana
    [5] => banana
    [10] => banana
    [bar] => banana
)

参考

  • array_fill() - 配列を指定した値で埋める
  • array_combine() - 一方の配列をキーとして、もう一方の配列を値として、ひとつの配列を生成する

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User Contributed Notes 6 notes

up
67
sergli at nigma dot ru
12 years ago
<?php
$a
= array("1");

var_dump(array_fill_keys($a, "test"));
?>

array(1) {
[1]=>
string(4) "test"
}

now string key "1" become an integer value 1, be careful.
up
31
atul dot kr_singh at hotmail dot com
11 years ago
If an associative array is used as the second parameter of array_fill_keys, then the associative array will be appended in all the values of the first array.
e.g.
<?php
$array1
= array(
"a" => "first",
"b" => "second",
"c" => "something",
"red"
);

$array2 = array(
"a" => "first",
"b" => "something",
"letsc"
);

print_r(array_fill_keys($array1, $array2));
?>

The output will be
Array(
[first] => Array(
[a] => first,
[b] => something,
[0] => letsc
),
[second] => Array(
[a] => first,
[b] => something,
[0] => letsc
),
[something] => Array(
[a] => first,
[b] => something,
[0] => letsc
),
[red] => Array(
[a] => first,
[b] => something,
[0] => letsc
)
)
up
3
ray.paseur sometimes uses gmail
2 years ago
Get an associative array of zeros for counting letter frequency

<?php
$ltrs
= array_fill_keys( range('a', 'z'), 0 );
up
-2
Scratchy
16 years ago
RE: bananasims at hotmail dot com

I also needed a work around to not having a new version of PHP and wanting my own keys. bananasims code doesn't like having an array as the second parameter...

Here's a slightly modified version than can handle 2 arrays as inputs:

//we want these values to be keys
$arr1 = (0 => "abc", 1 => "def");
/we want these values to be values
$arr2 = (0 => 452, 1 => 128);

function array_fill_keys($keyArray, $valueArray) {
if(is_array($keyArray)) {
foreach($keyArray as $key => $value) {
$filledArray[$value] = $valueArray[$key];
}
}
return $filledArray;
}

array_fill_keys($arr1, $arr2);

returns:
abc => 452, def =>128
up
-4
bananasims at hotmail dot com
17 years ago
Some of the versions do not have this function.
I try to write it myself.
You may refer to my script below

function array_fill_keys($array, $values) {
if(is_array($array)) {
foreach($array as $key => $value) {
$arraydisplay[$array[$key]] = $values;
}
}
return $arraydisplay;
}
up
-4
manavchugh988 at gmail dot com
2 years ago
see array_fill_keys are basically used to make a new array from a pre-existing array in a form that the value of the pre-existing array will now be the key of the new Array .And there value will be same That we had given in the 2nd parameter . Example Below---->>>

<?php
//pre existing array
$a = array("a","b","c","d","e");

//new array with a single same value

$newArray = array_fill_keys($a, "Testing");

//printing the array

echo "<pre>";
print_r($newArray);
echo
"</pre>";
?>
output;
Array
(
[a] => Testing
[b] => Testing
[c] => Testing
[d] => Testing
[e] => Testing
)
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