array_pad

(PHP 4, PHP 5)

array_pad — Udvider et array med et værdi til den valgte længde.

Beskrivelse

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

array_pad() returnere et kopi af input udvidet til en størrelse angivet ved pad_size med værdien pad_value . Hvis pad_size er positiv, bliver arrayet udvidet til højde for indholdet og hvis det er negativt bliver det tilføjet på venstre side. Hvis værdien af pad_size er mindre eller lige så stor som længden af input vil der ikke ske nogen ændringer. Der kan højst tilføjes 1048576 poster på en gang.

Example#1 array_pad() eksempel


<?php
$input = array(12, 10, 9);

$result = array_pad($input, 5, 0);
// resultatet bliver array(12, 10, 9, 0, 0)

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

$result = array_pad($input, 2, "noop");
// ingen ændring
?>

Se også array_fill() og range().

array_pop

array_multisort

Last updated: Sun, 25 Nov 2007

add a note User Contributed Notes
array_pad

tugla
18-Dec-2008 05:23


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 10:15


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
22-Oct-2004 06:48


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



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

29-Feb-2004 05:00


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 04:02


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
24-Mar-2003 01:06


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 04:39


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 02:36


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 11:20


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 12:25


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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array_pop

array_multisort

Last updated: Sun, 25 Nov 2007