array_pad

(PHP 4, PHP 5, PHP 7, PHP 8)

array_pad — Complète un tableau avec une valeur jusqu'à la longueur spécifiée

Description

array_pad(array $array, int $length, mixed $value): array

array_pad() retourne une copie du tableau array complétée jusqu'à la taille de length avec la valeur value. Si length est positif, alors le tableau est complété à droite, s'il est négatif, il est complété à gauche. Si la valeur absolue de length est plus petite que la taille du tableau array, alors le tableau n'est pas complété.

Liste de paramètres

array: Tableau initial de valeurs à compléter.
length: Nouvelle taille du tableau.
value: Valeur à insérer si l'argument array est plus petit que l'argument length.

Valeurs de retour

Retourne une copie du tableau array complétée jusqu'à la taille de length avec la valeur value. Si length est positif, alors le tableau est complété à droite, s'il est négatif, il est complété à gauche. Si la valeur absolue de length est plus petite que la taille du tableau array, alors le tableau n'est pas complété.

Historique

Version	Description
8.3.0	Avant la version 8.3, seuls 1048576 éléments pouvaient être ajoutés en une seule fois. Maintenant, cela est limité uniquement par la taille maximale d'un tableau.

Exemples

Exemple #1 Exemple avec array_pad()

<?php
$input = array(12, 10, 9);

$result = array_pad($input, 5, 0);
// Le résultat est : array(12, 10, 9, 0, 0)

$result = array_pad($input, -7, -1);
// Le résultat est : array(-1, -1, -1, -1, 12, 10, 9)

$result = array_pad($input, 2, "noop");
// pas complété
?>

Voir aussi

array_fill() - Remplit un tableau avec une même valeur
range() - Crée un tableau contenant un intervalle d'éléments

add a note

User Contributed Notes 11 notes

down

tugla ¶

15 years ago


Beware, if you try to pad an associative array using numeric keys, your keys will be re-numbered.



<?php

$a = array('size'=>'large', 'number'=>20, 'color'=>'red');

print_r($a);

print_r(array_pad($a, 5, 'foo'));



// use timestamps as keys

$b = array(1229600459=>'large', 1229604787=>20, 1229609459=>'red');

print_r($b);

print_r(array_pad($b, 5, 'foo'));

?>



yields this:

------------------

Array

(

    [size] => large

    [number] => 20

    [color] => red

)

Array

(

    [size] => large

    [number] => 20

    [color] => red

    [0] => foo

    [1] => foo

)

Array

(

    [1229600459] => large

    [1229604787] => 20

    [1229609459] => red

)

Array

(

    [0] => large

    [1] => 20

    [2] => red

    [3] => foo

    [4] => foo

)

down

goffrie at sympatico dot ca ¶

21 years ago


To daarius - you mean you have...



[2]=>"two"

[3]=>"three"



and you want...



[0]=>"FILLED"

[1]=>"FILLED"

[2]=>"two"

[3]=>"three"

[4]=>"FILLED"

[5]=>"FILLED"



If so, then the following code...



<?php

$array = array(2 => "two", 3 => "three");

$array = array_pad($array, count($array)+2, "FILLED");

$num = -(count($array)+2);

$array = array_pad($array, $num, "FILLED");

print_r($array);

?>



will return:

Array ( [0] => FILLED [1] => FILLED [2] => two [3] => three [4] => FILLED [5] => FILLED )

The ordering should be okay,...

down

scott*hurring.com ¶

22 years ago


to the previous commenter -- if you read the manual entry, you'd see that a negative pad_size will put the pad values at the front of the array.

down

mwwaygoo at hotmail dot com ¶

20 years ago


little older, a little wiser.



ksort() will order the array back into its normal order again

so:



<?php

$myArr = array(2 => 'two', 4 => 'four');



$newArr = array_pad(array(), 6, 'FILLED');

$newArr =$myArr+$newArr;

ksort($newArr);

?>



Will give : 

Array ( [0] => FILLED [1] => FILLED [2] => two [3] => FILLED [4] => four [5] => FILLED )

down

Anonymous ¶

20 years ago


One way to initialize a 20x20 multidimensional array.  



<?php

$a = array();

$b = array();

$b = array_pad($b,20,0);

$a = array_pad($a,20,$b);

?>

down

-1

hk, StrApp Bussiness Solutions ¶

17 years ago


A simple example for array_pad()

the syntax is as follows: array_pad(array(), (+/-)int, value)

where "array" is the array to which the value is to be added,

"(+/-) int" is a value that decides the length of the array(it should be greater than the length of the array.
if its a negative number then the value will be added at the left of the array else it will be added to the right.

"values" denotes the value to be added to the array

lets try an example:

<?php

$digits = array();
$digits[0] = 1;
$digits[1] = 2;
$digits[2] = 3;
$arraypad = array_pad($digits, -4, "0");
print_r($arraypad);

?>

output:

Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 )

down

-2

daarius at hotmail dot com ¶

22 years ago


yes that is true. But, if the index of the array is 2=two, 3=three

and i want 4 more keys to be filled. But, not just filled anywhere, but i want to maintain the key index.

so, i would like to have 0=FILLED, 1=FILLED ... 4=FILLED, 5=FILLED

now i got 4 more keys padded with my string.

We can do this "if" we know the missing keys, but if we dont, then it would be nice for array_pad() or perhaps some new function to do this?

obviously we can achive this by looping through the array using array_key_exists(), and if you dont find the key, simply create + fill it.
regards,
Daarius...

down

-3

mwwaygoo at hotmail dot com ¶

22 years ago


OR you could do this 



<?php

$myArr = array(2 => 'three', 3 => 'four');



$newArr = array_pad(array(), 4, 'FILLED');

$newArr =$myArr+$newArr;

?>



This gives your desired result BUT the ordering is a little wierd, because of the order they were added. Indexes are okay though and that is what you wanted.



print_r($newArr) outputs

Array ( [2] => three [3] => four [0] => FILLED [1] => FILLED )



hope this helps

down

-6

oaev at mail dot ru ¶

20 years ago


Easy way to get an array contains 5 random numbers from 0 to 9:

$rand_arr = array_rand( array_pad( array(), 10, 1 ), 5 );

down

-6

slava-san at mail dot ru ¶

11 years ago


// insert element to array
function array_insert(&$arr, $pos, $new_el=null) {
    $arraypad = array_pad($arr, count($arr)+1, 0);
    for ($i=count($arr)-1; $i>=$pos; $i--) {
        $arr[$i+1] = $arr[$i];
        if ($i == $pos) {
            $arr[$i] = $new_el;
        }
    }
}

$digits = array();
$digits[0] = 0;
$digits[1] = 1;
$digits[2] = 2;
$digits[3] = 3;
$digits[4] = 4;
$digits[5] = 5;
echo "was: "; var_dump($digits);

array_insert($digits, 3, 100);
echo "new: "; var_dump($digits);

down

-11

sonu50imedbvu at gmail dot com(Sonu Jaiswal) ¶

13 years ago


Just an info about the value of "$pad_size" , 



If we set the value of "$pad_size" from -3 to 3,



It will produce the output like:



<?php

$result = array_pad($input, -3, "noop");

//result is array(12, 10, 9)



$result = array_pad($input, 3, "noop");

//result is array(12, 10, 9)

?>



means array will remain the same.

add a note