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array_pop> <array_multisort
[edit] Last updated: Fri, 10 Feb 2012

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array_pad

(PHP 4, PHP 5)

array_padDopełnij tablicę do podanej długości podanymi wartościami

Opis

array array_pad ( array $wejście , int $rozmiar , mixed $wartość )

array_pad() zwraca kopię tablicy wejście dopełnioną do rozmiaru określonego przez rozmiar wartością wartość. Jeśli rozmiar jest wartością dodatnią, to tablica jest dopełniana z prawej strony, jeśli ujemna to z lewej. Jeśli wartość bezwzględna parametru rozmiar jest mniejsza lub równa długości tablicy wejście, to tablica nie jest dopełniana. Możliwe jest dodanie co najwyżej 1048576 elementów za jednym wywołaniem funkcji.

Parametry

wejście

Początkowa tablica, której wartości mają być dopełnione.

rozmiar

Nowy rozmiar tablicy.

wartość

Wartość, której należy użyć do dopełniania jeśli tablica wejście jest mniejsza niż rozmiar.

Zwracane wartości

Zwraca kopię tablicy wejście dopełnioną do rozmiaru określonego przez rozmiar wartością wartość. Jeśli rozmiar jest wartością dodatnią, to tablica jest dopełniana z prawej strony, jeśli ujemna to z lewej. Jeśli wartość bezwzględna parametru rozmiar jest mniejsza lub równa długości tablicy wejście, to tablica nie jest dopełniana.

Przykłady

Przykład #1 Przykład użycia array_pad()

<?php
$wejscie 
= array(12109);

$wynik array_pad($wejscie50);
// wynik to array(12, 10, 9, 0, 0)

$wynik array_pad($wejscie, -7, -1);
// wynik to array(-1, -1, -1, -1, 12, 10, 9)

$wynik array_pad($wejscie2"noop");
// nie ma dopełniania
?>

Zobacz też:

  • array_fill() - Wypełnij tablicę podanymi wartościami
  • range() - Stwórz tablicę zawierającą przedział elementów



array_pop> <array_multisort
[edit] Last updated: Fri, 10 Feb 2012
 
add a note add a note User Contributed Notes array_pad
sonu50imedbvu at gmail dot com(Sonu Jaiswal) 12-Jan-2011 12:53
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.
tugla 18-Dec-2008 09:23
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
)
hk, StrApp Bussiness Solutions 08-Jan-2007 02:15
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 )
oaev at mail dot ru 21-Oct-2004 11:48
Easy way to get an array contains 5 random numbers from 0 to 9:

$rand_arr = array_rand( array_pad( array(), 10, 1 ), 5 );
28-Feb-2004 09:00
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);
?>
mwwaygoo at hotmail dot com 16-Jan-2004 08:02
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 )
goffrie at sympatico dot ca 23-Mar-2003 05:06
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,...
mwwaygoo at hotmail dot com 19-Sep-2002 09:39
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
daarius at hotmail dot com 23-Jul-2002 07:36
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...
scott*hurring.com 19-Jul-2002 04:20
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.
ethanhunt314 at hotmail dot com 10-Dec-2000 04:25
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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