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PHP - Manual: array_fill_keys

2024-05-02

array_fill_keys

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

array_fill_keys — 使用指定的键和值填充数组

说明

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

使用 value 参数的值作为值，使用 keys 数组的值作为键来填充一个数组。

参数

keys

使用该数组的值作为键。非法值将被转换为字符串。

value

填充使用的值。

返回值

返回填充后的数组。

范例

示例 #1 array_fill_keys() 范例

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

以上例程会输出：

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

参见

  • array_fill() - 用给定的值填充数组
  • array_combine() - 创建一个数组，用一个数组的值作为其键名，另一个数组的值作为其值
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User Contributed Notes 10 notes

up
62
sergli at nigma dot ru
10 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
26
atul dot kr_singh at hotmail dot com
9 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
0
manavchugh988 at gmail dot com
1 day 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
)
up
0
ray.paseur sometimes uses gmail
1 month ago
Get an associative array of zeros for counting letter frequency

<?php
$ltrs = array_fill_keys( range('a', 'z'), 0 );
up
0
Scratchy
14 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
-2
bananasims at hotmail dot com
15 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
-5
matrebatre
14 years ago
This function does the same as:
<?php
$array = array_combine($keys,array_fill(0,count($keys),$value));
?>
up
-4
phydeaux
14 years ago
Scratchy's version still doesn't work like the definition describes.  Here's one that can take a mixed variable as the second parameter, defaulting to an empty string if it's not specified.  Don't know if this is exactly how the function works in later versions but it's at least a lot closer.

function array_fill_keys($target, $value = '') {
    if(is_array($target)) {
        foreach($target as $key => $val) {
            $filledArray[$val] = is_array($value) ? $value[$key] : $value;
        }
    }
    return $filledArray;
}

This works for either strings or numerics, so if we have

$arr1 = array(0 => 'abc', 1 => 'def');
$arr2 = array(0 => 452, 1 => 128);
$arr3 = array(0 => 'foo', 1 => 'bar');

then

array_fill_keys($arr1,$arr2)
returns: [abc] => 452, [def] => 128

array_fill_keys($arr1,0)
returns: [abc] => 0, [def] => 0

array_fill_keys($arr2,$arr3)
returns: [452] => foo, [128] => bar

array_fill_keys($arr3,'BLAH')
returns: [foo] => BLAH, [bar] => BLAH

and array_fill_keys($arr1)
returns: [abc] =>, [def] =>
up
-5
ntd at entidi dot it
6 years ago
To remove arbitrary keys from an associative array:

<?php

function nuke_keys($keys, $array) {
    return array_diff_key($array, array_fill_keys($keys, 0));
}

$array = array('blue'  => 1, 'red'  => 2, 'green'  => 3, 'purple' => 4);
$keys  = array('red', 'purple');

print_r(nuke_keys($keys, $array));
?>

The above snippet will return:

Array
(
    [blue] => 1
    [green] => 3
)
up
-16
taylanaktepe at yahoo dot com
7 years ago
$keys = array(1, 2, 3);

// Fill it with value.
$keys = array_fill_keys($keys, 'banana');
print_r($keys);

// Fill it different value.
$apples = array_fill_keys(array_keys($keys), 'apple');
print_r($apples);

// Output:
Array (
[1] => banana
[2] => banana
[3] => banana
)
Array (
[1] => apple
[2] => apple
[3] => apple
)
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官方地址：https://www.php.net/manual/en/function.array-fill-keys.php

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