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array_filter array_fill_keys

Last updated: Sat, 27 Jan 2007

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# array_fill

(PHP 4 >= 4.2.0, PHP 5)

array_fill -- 袟邪锌芯谢薪懈褌褜 屑邪褋褋懈胁 芯锌褉械写械谢械薪薪褘屑 蟹薪邪褔械薪懈械屑

## 袨锌懈褋邪薪懈械

array array_fill ( integer start_index, integer num, mixed value )

肖褍薪泻褑懈褟 array_fill() 胁芯蟹胁褉邪褖邪械褌 屑邪褋褋懈胁, 褋芯写械褉卸邪褖懈泄 `num` 褝谢械屑械薪褌芯胁, 懈屑械褞褖懈褏 蟹薪邪褔械薪懈械 锌邪褉邪屑械褌褉邪 `value`. 袧褍屑械褉邪褑懈褟 泻谢褞褔械泄 褝谢械屑械薪褌芯胁 屑邪褋褋懈胁邪 薪邪褔懈薪邪褞褌褋褟 褋芯 蟹薪邪褔械薪懈褟 锌邪褉邪屑械褌褉邪 `start_index` parameter.

袩褉懈屑械褉 1. 袩褉懈屑械褉 懈褋锌芯谢褜蟹芯胁邪薪懈褟 array_fill()

`$a = array_fill(5, 6, 'banana');`

袩械褉械屑械薪薪邪褟 $a 褌械锌械褉褜 褋芯写械褉卸懈褌 褋谢械写褍褞褖懈械 蟹薪邪褔械薪懈褟 (胁褘胁芯写 褎褍薪泻褑懈懈 print_r()):

    Array
    (
        [5]  => banana
        [6]  => banana
        [7]  => banana
        [8]  => banana
        [9]  => banana
        [10] => banana
    )

add a note User Contributed Notes
array_fill
caliban at darklock dot com
23-May-2005 07:42
`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"
}`
csst0266 at cs dot uoi dot gr
11-Aug-2004 10:32
`This is what I recently did to quickly create a two dimensional array (10x10), initialized to 0:
<?php
$a = array_fill(0, 10, array_fill(0, 10, 0));
?>
This should work for as many dimensions as you want, each time passing to array_fill() (as the 3rd argument) another array_fill() function.`
jausion at hotmail-dot-com
28-Mar-2003 11:50
`For PHP < 4.2.0 users:
Add this to your script:
if (!function_exists('array_fill')) {
require_once('array_fill.func.php');
}
and the array_fill.func.php file:
<?php
// For PHP version < 4.2.0 missing the array_fill function,
// I provide here an alternative. -Philippe
function array_fill($iStart, $iLen, $vValue) {
$aResult = array();
for ($iCount = $iStart; $iCount < $iLen + $iStart; $iCount++) {
$aResult[$iCount] = $vValue;
}
return $aResult;
}
?>`
25-Aug-2002 01:59
`array_fill() cannot be used to setup only missing keys in an array. This may be necessary for example before using implode() on a sparse filled array.
The solution is to use this function:
<?php
function array_setkeys(&$array, $fill = NULL) {
牋$indexmax = -1;
牋for (end($array); $key = key($array); prev($array)) {
牋牋if ($key > $indexmax)
牋牋牋$indexmax = $key;
牋}
牋for ($i = 0; $i <= $indexmax; $i++) {
牋牋if (!isset($array[$i]))
牋牋牋$array[$i] = $fill;
牋}
牋ksort($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.`
add a note
array_filter array_fill_keys

Last updated: Sat, 27 Jan 2007
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