array_fill_keys

(PHP 5 >= 5.2.0)

array_fill_keysFill an array with values, specifying keys

Description

array array_fill_keys ( array $keys , mixed $value )

Fills an array with the value of the value parameter, using the values of the keys array as keys.

Parameters

keys

Array of values that will be used as keys. Illegal values for key will be converted to string.

value

Value to use for filling

Return Values

Returns the filled array

Examples

Example #1 array_fill_keys() example

<?php
$keys 
= array('foo'510'bar');
$a array_fill_keys($keys'banana');
print_r($a);
?>

The above example will output:

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

See Also

Коментарии

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;
}
2006-12-19 07:03:24
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
Автор:
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
2008-05-02 17:18:03
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
Автор:
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] =>
2008-05-14 13:26:25
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
Автор:
This function does the same as:
<?php
$array 
array_combine($keys,array_fill(0,count($keys),$value));
?>
2008-06-20 10:28:13
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
<?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.
2012-05-25 14:53:22
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
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
    )
)
2013-01-04 13:39:10
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
$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
)
2014-07-21 12:46:15
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
To remove arbitrary keys from an associative array:

<?php

function nuke_keys($keys$array) {
    return 
array_diff_key($arrayarray_fill_keys($keys0));
}

$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
)
2015-10-23 22:04:15
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
Get an associative array of zeros for counting letter frequency

<?php
$ltrs 
array_fill_keysrange('a''z'), );
2022-05-07 18:50:33
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html
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
)
2022-06-20 14:32:53
http://php5.kiev.ua/manual/ru/function.array-fill-keys.html

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