(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
array_fill — Llena un array con valores
Llena un array con
num entradas del valor del
parámetro value, las keys inician en el
parámetro start_index.
start_indexEl primer índice del array retornado.
Si start_index es negativo,
el primer índice del array retornado será
start_index y los siguientes
indices comenzarán desde cero
(ver ejemplo).
numNúmero de elementos a insertar. Debe ser mayor o igual que cero.
valueValor a usar para el llenado.
Retorna el array llenado.
Arroja un E_WARNING si num es
menor que cero.
| Versión | Descripción |
|---|---|
| 5.6.0 |
num ahora puede ser cero. Anteriormente,
se requería que num fuera maoyor que cero.
|
Ejemplo #1 Ejemplo de array_fill()
<?php
$a = array_fill(5, 6, 'banana');
$b = array_fill(-2, 4, 'pear');
print_r($a);
print_r($b);
?>El resultado del ejemplo sería:
Array
(
[5] => banana
[6] => banana
[7] => banana
[8] => banana
[9] => banana
[10] => banana
)
Array
(
[-2] => pear
[0] => pear
[1] => pear
[2] => pear
)
Ver también la sección Arrays del manual para una explicación detallada de las claves negativas.
This is what I recently did to quickly create a two dimensional array (10x10), initialized to 0:<?php $a = array_fill(0, 10, array_fill(0, 10, 0));?>This should work for as many dimensions as you want, each time passing to array_fill() (as the 3rd argument) another array_fill() function.If you need negative indices:<?php$b = array_fill(-2, 4, 'pear');//this is not what we want$c = array_fill_keys(range(-2,1),'pear');//these are negative indicesprint_r($b);print_r($c);?>Here is result of the code above:Array( [-2] => pear [0] => pear [1] => pear [2] => pear)Array( [-2] => pear [-1] => pear [0] => pear [1] => pear)Using objects with array_fill may cause unexpected results. Consider the following:<?phpclass Foo { public $bar = "banana";}//fill an array with objects$array = array_fill(0, 2, new Foo());var_dump($array);/*array(2) { [0]=> object(Foo)#1 (1) { ["bar"]=> string(6) "banana" } [1]=> object(Foo)#1 (1) { ["bar"]=> string(6) "banana" }} *///now we change the attribute of the object stored in index 0//this actually changes the attribute for EACH object in the ENTIRE array$array[0]->bar = "apple";var_dump($array);/*array(2) { [0]=> object(Foo)#1 (1) { ["bar"]=> string(5) "apple" } [1]=> object(Foo)#1 (1) { ["bar"]=> string(5) "apple" }} */?>Objects are filled in the array BY REFERENCE. They are not copied for each element in the array.As of PHP 8.0 the example code<?php$b = array_fill(-2, 4, 'pear');print_r($b);?>now returnsArray( [-2] => pear [-1] => pear [0] => pear [1] => pear)See https://wiki.php.net/rfc/negative_array_index and https://github.com/php/php-src/pull/3772I made this function named "array_getMax" that returns te maximum value and index, from array:
<?php
//using array_search_all by helenadeus at gmail dot com
function array_search_all($needle, $haystack)
{#array_search_match($needle, $haystack) returns all the keys of the values that match $needle in $haystack
foreach ($haystack as $k=>$v) {
if($haystack[$k]==$needle){
$array[] = $k;
}
}
return ($array);
}
function array_getMax($array){
$conteo=array_count_values($array);
if( count($conteo)==1 ){//returns full array when all values are the same.
return $array;
}
arsort($array);
//$antValue=null;
$maxValue=null;
$keyValue=null;
foreach($array as $key=>$value){
if($maxValue==null){
$maxValue=$value;
$keyValue=$key;
break;
}
}
$resultSearch=array_search_all($maxValue, $array);
return array_fill_keys($resultSearch, $maxValue);
}
//example
$arreglo=array('e1'=>99,'e2'=>'99','e3'=>1,'e4'=>1,'e5'=>98);
var_dump(array_getMax($arreglo));
//output
/*
array(2) {
["e1"]=>
int(99)
["e2"]=>
int(99)
}
*/
?>
I hope some one find this usefullFill missing keys in a (numerically-indexed) array with a default value<?phpfunction fill_missing_keys($array, $default = null, $atleast = 0){ return $array + array_fill(0, max($atleast, max(array_keys($array))), $default);}?>