超越PHP - Exceed PHP: array_fill

array_fill

(PHP 4 >= 4.2.0, PHP 5)

array_fill -- 用给定的值填充数组

说明

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

array_fill() 用 value 参数的值将一个数组填充 num 个条目，键名由 start_index 参数指定的开始。注意 num 必须是一个大于零的数值，否则 PHP 会发出一条警告。

例子 1. array_fill() 例子

<?php $a = array_fill(5, 6, 'banana'); print_r($a); ?>
$a 现在是：
Array ( [5] => banana [6] => banana [7] => banana [8] => banana [9] => banana [10] => banana )

参见 str_repeat() 和 range()。

add a note User Contributed Notes
array_fill

26-Aug-2002 04:59

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.

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