<?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.
(PHP 5 >= 5.2.0, PHP 7, PHP 8)
array_fill_keys — 使用指定的键和值填充数组
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。
返回填充后的数组。
示例 #1 array_fill_keys() 示例
<?php
$keys = array('foo', 5, 10, 'bar');
$a = array_fill_keys($keys, 'banana');
print_r($a);
?>以上示例会输出：
Array
(
[foo] => banana
[5] => banana
[10] => banana
[bar] => banana
)
<?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.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, $array2));
?>
The output will be
Array(
[first] => Array(
[a] => first,
[b] => something,
[0] => letsc
),
[second] => Array(
[a] => first,
[b] => something,
[0] => letsc
),
[something] => Array(
[a] => first,
[b] => something,
[0] => letsc
),
[red] => Array(
[a] => first,
[b] => something,
[0] => letsc
)
)Get an associative array of zeros for counting letter frequency<?php$ltrs = array_fill_keys( range('a', 'z'), 0 );RE: bananasims at hotmail dot comI 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, $arr2);returns:abc => 452, def =>128Some of the versions do not have this function.I try to write it myself.You may refer to my script belowfunction array_fill_keys($array, $values) { if(is_array($array)) { foreach($array as $key => $value) { $arraydisplay[$array[$key]] = $values; } } return $arraydisplay;}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)