array_fill_keys
To better handle the problem of sparse array completion mentioned a couple years ago...
What you really need in this scenario is an empty array containing all the desired keys, and a sparse array containing the keys and values you want overridden. This PHP5 function does that. (The PEAR package PHP_Compat should be able to fill in the gap -- array_combine() -- for a 4.3 install, if necessary.)
<?php
function array_complete(
$keys="", // array of keys you need filled, in order
$sparse="" // sparse array to override blanks
)
{
if(!is_array($sparse))
$sparse=array();
if(!is_array($keys))
return $sparse;
return array_merge(
array_combine( // create an associative array
$keys, // your list of keys
array_fill( // blank value for each key
0,count(
$keys
),""
)
),$sparse // merge with your incomplete array
);
}
?>
This merges in your sparse array (inserting any additional keys in that array after the ones you've specified), placing its values in the key order you specify, leaving all the other values blank.
Test call: var_dump(array_complete(array("test1", "test2", "test3", "test4", "test5"), array("test3" => "test3", "test1" => "test1", "garbage" => "garbage")));
Result: array(6) {
["test1"]=>
string(5) "test1"
["test2"]=>
string(0) ""
["test3"]=>
string(5) "test3"
["test4"]=>
string(0) ""
["test5"]=>
string(0) ""
["garbage"]=>
string(7) "garbage"
}
array_fill
(PHP 4 >= 4.2.0, PHP 5)
array_fill — 값으로 배열 채우기
설명
배열에 value 인수 값으로 num 엔트리를 채웁니다. 키는 start_index 인수에서 시작합니다.
인수
- start_index
-
반환하는 배열의 첫 인덱스
- num
-
삽입할 원소 수
- value
-
채우는 데 사용할 값
반환값
채운 배열을 반환합니다.
오류/예외
num 가 1보다 작으면 E_WARNING이 발생합니다.
예제
Example #1 array_fill() 예제
<?php
$a = array_fill(5, 6, 'banana');
$b = array_fill(-2, 2, 'pear');
print_r($a);
print_r($b);
?>
위 예제의 출력:
Array
(
[5] => banana
[6] => banana
[7] => banana
[8] => banana
[9] => banana
[10] => banana
)
Array
(
[-2] => pear
[0] => pear
)
주의
음수 키에 관한 자세한 설명은 매뉴얼 배열 섹션을 참고하십시오.
참고
- array_fill_keys() - Fill an array with values, specifying keys
- str_repeat() - 문자열을 반복
- range() - 원소의 범위를 가지는 배열 생성
add a note
User Contributed Notesarray_fill
caliban at darklock dot com
23-May-2005 11:42
23-May-2005 11:42
csst0266 at cs dot uoi dot gr
12-Aug-2004 02:32
12-Aug-2004 02:32
This is what I recently did to quickly create a two dimensional array (10x10), initialized to 0:
<?php
$a = array_fill(0, 10, array_fill(0, 10, 0));
?>
This should work for as many dimensions as you want, each time passing to array_fill() (as the 3rd argument) another array_fill() function.
jausion at hotmail-dot-com
29-Mar-2003 04:50
29-Mar-2003 04:50
For PHP < 4.2.0 users:
Add this to your script:
if (!function_exists('array_fill')) {
require_once('array_fill.func.php');
}
and the array_fill.func.php file:
<?php
// For PHP version < 4.2.0 missing the array_fill function,
// I provide here an alternative. -Philippe
function array_fill($iStart, $iLen, $vValue) {
$aResult = array();
for ($iCount = $iStart; $iCount < $iLen + $iStart; $iCount++) {
$aResult[$iCount] = $vValue;
}
return $aResult;
}
?>
26-Aug-2002 05:59
array_fill() cannot be used to setup only missing keys in an array. This may be necessary for example before using implode() on a sparse filled array.
The solution is to use this function:
<?php
function array_setkeys(&$array, $fill = NULL) {
$indexmax = -1;
for (end($array); $key = key($array); prev($array)) {
if ($key > $indexmax)
$indexmax = $key;
}
for ($i = 0; $i <= $indexmax; $i++) {
if (!isset($array[$i]))
$array[$i] = $fill;
}
ksort($array);
}
?>
This is usefull in some situations where you don't know which key index was filled and you want to preserve the association between a positioned field in an imploded array and the key index when exploding it.