array_multisort
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.
array_pad
(PHP 4, PHP 5)
array_pad — 지정한 길이만큼 특정 값으로 배열 채우기
설명
array_pad()는 pad_value 값을 pad_size 로 설정된 길이만큼을 채워넣은 input의 복사본을 반환한다. pad_size가 양수이면 배열의 오른쪽에 채워지고, 음수이면 왼쪽에 채워지게 된다. pad_size의 절대값이 input의 길이보다 작거나 같으면 패딩(padding)은 일어나지 않는다. 한번에 1048576 원소까지 추가할 수 있습니다.
인수
- input
-
값을 채울 초기 배열.
- pad_size
-
배열의 새 크기.
- pad_value
-
input이 pad_size보다 작으면 채울 값.
반환값
지정한 pad_size만큼 pad_value로 채운 input의 사본을 반환합니다. pad_size가 양수이면 배열 오른쪽에 채우고, 음수이면 왼쪽에 채웁니다. pad_size의 절대값이 input의 크기보다 작거나 같으면 채우지 않습니다.
예제
Example #1 array_pad() 예제
<?php
$input = array(12, 10, 9);
$result = array_pad($input, 5, 0);
// result is array(12, 10, 9, 0, 0)
$result = array_pad($input, -7, -1);
// result is array(-1, -1, -1, -1, 12, 10, 9)
$result = array_pad($input, 2, "noop");
// not padded
?>
add a note
User Contributed Notes
array_pad
sonu50imedbvu at gmail dot com(Sonu Jaiswal)
12-Jan-2011 12:53
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.