array_pop

array_multisort

[edit] Last updated: Fri, 07 Jun 2013

array_pad

(PHP 4, PHP 5)

array_pad — Rellena un array a la longitud especificada con un valor

Descripción

array array_pad ( array $input , int $pad_size , mixed $pad_value )

array_pad() devuelve una copia de input rellenada al tamaño especificado por pad_size con el valor pad_value. Si pad_size es positivo el array se rellena hacia la derecha, si es negativo hacia la izquierda. Si el valor absoluto de pad_size es menor o igual a la longitud de input, no se lleva a cabo el relleno. Es posible añadir como máximo 1048576 elementos de una sola vez.

Parámetros

input: Array inicial de valores a rellenar.
pad_size: Nuevo tamaño del array.
pad_value: Valor a rellenar si input es menor que pad_size.

Valores devueltos

Devuelve una copia de input rellenada al espacio especificado por pad_size con el valor pad_value. Si pad_size es positivo el array es relleno hacia la derecha, si es negativo hacia la izquierda. Si el valor absoluto de pad_size es menor o igual que la longitud de input, no se lleva a cabo el relleno.

Ejemplos

Ejemplo #1 Ejemplo de array_pad()


<?php
$input = array(12, 10, 9);

$result = array_pad($input, 5, 0);
// el resultado es array(12, 10, 9, 0, 0)

$result = array_pad($input, -7, -1);
// el resultado es array(-1, -1, -1, -1, 12, 10, 9)

$result = array_pad($input, 2, "noop");
// sin relleno
?>

Ver también

array_fill() - Llena un array con valores
range() - Crear un array que contiene un rango de elementos

array_pop

array_multisort

[edit] Last updated: Fri, 07 Jun 2013

add a note User Contributed Notes array_pad - [11 notes]

down

mwwaygoo at hotmail dot com ¶

10 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

goffrie at sympatico dot ca ¶

10 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 ¶

10 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

tugla ¶

4 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

mwwaygoo at hotmail dot com ¶

9 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

oaev at mail dot ru ¶

8 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

Anonymous ¶

9 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

daarius at hotmail dot com ¶

10 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

-1

sonu50imedbvu at gmail dot com(Sonu Jaiswal) ¶

2 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.

down

-1

hk, StrApp Bussiness Solutions ¶

6 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

-1

ethanhunt314 at hotmail dot com ¶

12 years ago


This is useful when using next() and prev() function in a while loop to traverse an array. 





For example the following code will only output up to 8.





<?php


$test[] = "1";


$test[] = "2";


$test[] = "3";


$test[] = "4";


$test[] = "5";


$test[] = "6";


$test[] = "7";


$test[] = "8";


$test[] = "9";


$test[] = "10";


$test[] = " ";


$test[] = " ";


$test[] = " ";





$count = count($test);





while($i < $count) {





$now = current($test);


echo "<p>$now</p>";





next($test);


next($test);


next($test);


prev($test);


prev($test);


prev($test);








$i++;


next($test);


}


?>





But if you use:


$test = array_pad($test, 13, " ");





you will get all of your output.

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