array_pad

(PHP 4, PHP 5)

array_padPad array to the specified length with a value

Description

array array_pad ( array $array , int $size , mixed $value )

array_pad() returns a copy of the array padded to size specified by size with value value. If size is positive then the array is padded on the right, if it's negative then on the left. If the absolute value of size is less than or equal to the length of the array then no padding takes place. It is possible to add at most 1048576 elements at a time.

Parameters

array

Initial array of values to pad.

size

New size of the array.

value

Value to pad if array is less than size.

Return Values

Returns a copy of the array padded to size specified by size with value value. If size is positive then the array is padded on the right, if it's negative then on the left. If the absolute value of size is less than or equal to the length of the array then no padding takes place.

Examples

Example #1 array_pad() example

<?php
$input 
= array(12109);

$result array_pad($input50);
// result is array(12, 10, 9, 0, 0)

$result array_pad($input, -7, -1);
// result is array(-1, -1, -1, -1, 12, 10, 9)

$result array_pad($input2"noop");
// not padded
?>

See Also

  • array_fill() - Fill an array with values
  • range() - Create an array containing a range of elements

Коментарии

Автор:
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.
2002-07-19 19:20:08
http://php5.kiev.ua/manual/ru/function.array-pad.html
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...
2002-07-23 10:36:33
http://php5.kiev.ua/manual/ru/function.array-pad.html
OR you could do this 

<?php
$myArr 
= array(=> 'three'=> '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
2002-09-19 12:39:38
http://php5.kiev.ua/manual/ru/function.array-pad.html
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(=> "two"=> "three");
$array array_pad($arraycount($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,...
2003-03-23 19:06:54
http://php5.kiev.ua/manual/ru/function.array-pad.html
little older, a little wiser.

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

<?php
$myArr 
= array(=> 'two'=> '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 )
2004-01-16 10:02:44
http://php5.kiev.ua/manual/ru/function.array-pad.html
Автор:
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);
?>
2004-02-28 23:00:40
http://php5.kiev.ua/manual/ru/function.array-pad.html
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 )
2007-01-08 04:15:19
http://php5.kiev.ua/manual/ru/function.array-pad.html
Автор:
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($a5'foo'));

// use timestamps as keys
$b = array(1229600459=>'large'1229604787=>201229609459=>'red');
print_r($b);
print_r(array_pad($b5'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
)
2008-12-18 11:23:35
http://php5.kiev.ua/manual/ru/function.array-pad.html

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