PHP 5.6.0beta1 released

array_pop

(PHP 4, PHP 5)

array_popLiefert das letzte Element eines Arrays

Beschreibung

mixed array_pop ( array &$array )

array_pop() liefert den letzten Wert von array, und verkürzt array um ein Element. Ist array leer (oder kein Array), wird NULL zurückgegeben. In letzterem Fall wird auch eine Warnung erzeugt.

Hinweis: Diese Funktion setzt (reset()) nach Verwendung den array-Zeiger zurück.

Parameter-Liste

array

Das Array, aus dem der Wert geholt werden soll.

Rückgabewerte

Gibt den letzten Wert von array zurück. Wenn array leer ist (oder kein Array), wird NULL zurückgegeben.

Beispiele

Beispiel #1 array_pop()-Beispiel

<?php
$stack 
= array("Orange""Banane""Apfel""Himbeere");
$fruit array_pop($stack);
print_r($stack);
?>

Danach hat $stack nur 3 Elemente:

Array
(
    [0] => Orange
    [1] => Banane
    [2] => Apfel
)

und Himbeere wird $fruit zugewiesen.

Siehe auch

  • array_push() - Fügt ein oder mehr Elemente an das Ende eines Arrays
  • array_shift() - Liefert ein Element vom Beginn eines Arrays
  • array_unshift() - Fügt ein oder mehr Elemente am Anfang eines Arrays ein

add a note add a note

User Contributed Notes 14 notes

up
4
Orsi
6 years ago
Hi,

Here is a simple function which delete one element from the array (with value):
<?php
/*
* This function deletes the given element from a one-dimension array
* Parameters: $array:    the array (in/out)
*             $deleteIt: the value which we would like to delete
*             $useOldKeys: if it is false then the function will re-index the array (from 0, 1, ...)
*                          if it is true: the function will keep the old keys
* Returns true, if this value was in the array, otherwise false (in this case the array is same as before)
*/
function deleteFromArray(&$array, $deleteIt, $useOldKeys = FALSE)
{
   
$tmpArray = array();
   
$found = FALSE;
    foreach(
$array as $key => $value)
    {
        if(
$value !== $deleteIt)
        {
            if(
FALSE === $useOldKeys)
            {
               
$tmpArray[] = $value;
            }
            else
            {
               
$tmpArray[$key] = $value;
            }
        }
        else
        {
           
$found = TRUE;
        }
    }
  
   
$array = $tmpArray;
  
    return
$found;
}
?>

Maybe it will help somebody...
up
4
Alex Chacn
11 years ago
alex.chacon@terra.com
Hi
Here there is a function that delete a elemente from a array and re calculate indexes

<?php
function eliminarElementoArreglo ($array, $indice)
{
    if (
array_key_exists($indice, $array))
    {
       
$temp = $array[0];
       
$array[0] = $array[$indice];
       
$array[$indice] = $temp;
       
array_shift($array);

       
//reacomodamos ndices
       
for ($i = 0 ; $i < $indice ; $i++)
        {
           
$dummy = $array[$i];
           
$array[$i] = $temp;
           
$temp = $dummy;
        }
    }
    return
$array;
}
?>
up
3
sonetti at hotmail dot com
6 years ago
@smp_info
I think you are still tired. What would be wrong with:

<?php
$array
= array('one', 'two', 'three', 'four');

//pop the last element off
array_pop($array);

//$array == array('one', 'two', 'three');
?>

As the documentation clearly notes, array_pop() not only returns the last element, but actually removes it from the array wich is passed by reference. Calling array_diff is a waste of resources.
up
1
mcgroovin at gmail dot com
5 years ago
I wrote a simple function to perform an intersect on multiple (unlimited) arrays.

Pass an array containing all the arrays you want to compare, along with what key to match by.

<?php
function multipleArrayIntersect($arrayOfArrays, $matchKey)
{
   
$compareArray = array_pop($arrayOfArrays);
   
    foreach(
$compareArray AS $key => $valueArray){
        foreach(
$arrayOfArrays AS $subArray => $contents){
            if (!
in_array($compareArray[$key][$matchKey], $contents)){
                unset(
$compareArray[$key]);
            }
        }
    }

    return
$compareArray;
}
?>
up
1
doyley3731 at gmail dot com
6 years ago
I had a problem when using this function because my array was made up entirley of numbers, so I have made my own function.  Hopefully it will be useful to somebody.

function array_trim_end($array){

$num=count($array);
$num=$num-1;
unset($array[$num]);

return $array;
}
up
1
rmondragon at gmail dot com
8 years ago
In a previous example ...
<?php
function array_trim ( $array, $index ) {
   if (
is_array ( $array ) ) {
     unset (
$array[$index] );
    
array_unshift ( $array, array_shift ( $array ) );
     return
$array;
     }
   else {
     return
false;
     }
   }
?>

This have a problem. if u unset the last value and then use
<?
array_unshift
( $array, array_shift ( $array ) );
?>

will return a :  Array ( [0] => )
so u can fix it using...

<?php
if (count($array) > 0) array_unshift ( $values, array_shift ( $values ) );           
?>

good luck ;)
up
0
Anonymous
1 month ago
Strict Standards will be thrown out if you put exploded array in array_pop:
<?php
$a
= array_pop(explode(",", "a,b,c"));
echo
$a;
?>

You will see:
PHP Strict Standards:  Only variables should be passed by reference in - on line 2

Strict Standards: Only variables should be passed by reference in - on line 2
c

Notice that, you should assign a variable for function explode, then pass the variable reference into array_pop to avoid the Strict Standard warning.
up
0
elad dot yosifon at gmail dot com
8 months ago
Notice:
the complexity of array_pop() is O(1).
the complexity of array_shift() is O(n).
array_shift() requires a re-index process on the array, so it has to run over all the elements and index them.
up
0
Anonymous
9 years ago
strrchr is a lot more useful than the other example using array_pop for finding the extension of a file. For example:

<?php
$ext
= strrchr($filename, ".");
?>

$ext will contain the extension of the file, including a ".", if the file has an extension, and FALSE if the file has no extension. If the file has multiple extensions, such as "filename.tar.gz", then this construction will just return the last extension.
up
0
Anonymous
10 years ago
A function to delete an array value that recalculates the index ( its very short and easy to understand ).
Hope this might help someone...

<?php
/* Usage:
    $array : Array
    $indey : Integer
   
    The value of $array at the index $index will be
    deleted by the function.
*/
function array_trim ( $array, $index ) {
   if (
is_array ( $array ) ) {
      unset (
$array[$index] );
     
array_unshift ( $array, array_shift ( $array ) );
      return
$array;
      }
   else {
      return
false;
      }
   }
?>
up
0
ryan8613(at)hotmail(dot)com
10 years ago
A function that may help some out, considering it's pretty much the one mentioned previously...

<?php
function array_trim($arr, $indice) {
        if(!isset(
$indice)) {
               
$indice = count($arr)-1;
        }
        unset(
$arr[$indice]);
       
array_shift($arr);
        return
$arr;
}
?>

It cuts the given index value off of the array, but without the shift, if  the 'index' value isn't given, it cuts off the end value.
up
-1
qeremy
2 years ago
For the sake of array_unshift()
:)

<?php
function array_unpop(&$arr) {
   
$args = func_get_args(); unset($args[0]);
   
$tarr = array();
    foreach (
$args as $arg) {
       
$tarr[] = $arg;
    }
   
$arr = array_merge($arr, $tarr);
}

$queue = array("orange", "banana");
array_unpop($queue, "apple", "raspberry");
print_r($queue);
?>

Array
(
    [0] => orange
    [1] => banana
    [2] => apple
    [3] => raspberry
)
up
-2
eddie at metafoundry dot com
9 years ago
Quick way to get the extension from a file name using array_pop:

$ext = array_pop(explode(".",$filename));
up
-1
Igor Feghali
5 years ago
Beware that array_pop() returns a copy of the element (even if the array element is a reference). That means you will get different results on PHP 4 and 5 when dealing with objects.

<?php
$a
= new stdClass();
$a->foo = 'bar';

$arr = array(&$a);
$b = array_pop($arr);

$b->foo = 'baz';

var_dump($a);
?>

Output of PHP 5.2.8:
object(stdClass)#1 (1) {
  ["foo"]=>
  string(3) "baz"
}

Output of PHP 4.4.9:
object(stdClass)(1) {
  ["foo"]=>
  string(3) "bar"
}

For more information please refer to:
http://br2.php.net/manual/en/language.oop5.references.php
To Top