PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    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

    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

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    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
    18 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
    )
    ＋add a note