array_slice

(PHP 4, PHP 5, PHP 7, PHP 8)

array_slice — Extraer una parte de un array

Descripción

array_slice(
    array $array,
    int $offset,
    int $length = null,
    bool $preserve_keys = false
): array

array_slice() devuelve la secuencia de elementos del array array tal y como se especifica en los parámetros offset y length.

Parámetros

array: El array de entrada.
offset: Si el índice dado por offset no es negativo, la secuencia empezará en esa posición del array. Si el offset es negativo, la secuencia empezará en esa posición empezando por el final del array.
length: Si la longitud dada por length es positiva, la secuencia tendrá hasta tantos elementos como indique el valor. Si el array es más corto que length, solamente estarán presentes los elementos disponibles del array. Si se proporciona length y es negativo, la secuencia finalizará en tantos elementos empezando por el final del array. Si se omite, entonces la secuencia contendrá todo el contenido desde offset hasta el final del array.
preserve_keys: Observe que array_slice() reordenará y reinicializará los índices numéricos del array de forma predeterminada. Se puede cambiar esta comportamiento estableciendo el parámetro preserve_keys a true.

Valores devueltos

Devuelve la parte del array. Si el índice es mayor que el tamaño del array, devuelve un array vacío.

Historial de cambios

Versión	Descripción
5.2.4	El valor predeterminado del parámetro `length` se cambió a `NULL`. Una `length` `NULL` ahora indica a la función que use la longitud de `array`. Antes de esta versión, una `length` `NULL` se tomaba como de longitud cero (no se devolvía nada).
5.0.2	Se añadió el parámetro opcional `preserve_keys`.

Ejemplos

Ejemplo #1 Ejemplos de array_slice()

<?php
$entrada = array("a", "b", "c", "d", "e");

$salida = array_slice($entrada, 2);      // devuelve "c", "d", y "e"
$salida = array_slice($entrada, -2, 1);  // devuelve "d"
$salida = array_slice($entrada, 0, 3);   // devuelve "a", "b", y "c"

// observe las diferencias en las claves de los arrays
print_r(array_slice($entrada, 2, -1));
print_r(array_slice($entrada, 2, -1, true));
?>

El resultado del ejemplo sería:

Array
(
    [0] => c
    [1] => d
)
Array
(
    [2] => c
    [3] => d
)

Ver también

array_splice() - Elimina una porción del array y la reemplaza con otra cosa
unset() - Destruye una o más variables especificadas
array_chunk() - Divide un array en fragmentos

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User Contributed Notes 17 notes

down

taylorbarstow at the google mail service ¶

18 years ago

Array slice function that works with associative arrays (keys):

function array_slice_assoc($array,$keys) {
    return array_intersect_key($array,array_flip($keys));
}

down

nathan dot fiscaletti at gmail dot com ¶

6 years ago

If you want an associative version of this you can do the following:

function array_slice_assoc($array,$keys) {
    return array_intersect_key($array,array_flip($keys));
}

However, if you want an inverse associative version of this, just use array_diff_key instead of array_intersect_key. 

function array_slice_assoc_inverse($array,$keys) {
    return array_diff_key($array,array_flip($keys));
}

Example:

$arr = [
    'name' => 'Nathan',
    'age' => 20,
    'height' => 6
];

array_slice_assoc($arr, ['name','age']);

will return 

Array (
     'name' = 'Nathan',
     'age' = 20
)

Where as

array_slice_assoc_inverse($arr, ['name']);

will return 

Array (
    'age' = 20,
    'height' = 6
)

down

Ray.Paseur often uses Gmail ¶

11 years ago

<?php
// CHOP $num ELEMENTS OFF THE FRONT OF AN ARRAY
// RETURN THE CHOP, SHORTENING THE SUBJECT ARRAY
function array_chop(&$arr, $num)
{
    $ret = array_slice($arr, 0, $num);
    $arr = array_slice($arr, $num);
    return $ret;
}

down

ted.devito at 9gmail9 dot 99com ¶

16 years ago

based on worldclimb's arem(), here is a recursive array value removal tool that can work with multidimensional arrays.

function remove_from_array($array,$value){
    $clear = true;
    $holding=array();
   
    foreach($array as $k => $v){
        if (is_array($v)) {
            $holding [$k] = remove_from_array ($v, $value);
            }
        elseif ($value == $v) {
            $clear = false;
            }
        elseif($value != $v){
            $holding[$k]=$v; // removes an item by combing through the array in order and saving the good stuff
        }
    }   
    if ($clear) return $holding; // only pass back the holding array if we didn't find the value 
}

down

worldclimb at 99gmail99 dot com ¶

16 years ago

array_slice can be used to remove elements from an array but it's pretty simple to use a custom function.

One day array_remove() might become part of PHP and will likely be a reserved function name, hence the unobvious choice for this function's names.

<?
function arem($array,$value){
    $holding=array();
    foreach($array as $k => $v){
        if($value!=$v){
            $holding[$k]=$v;
        }
    }    
    return $holding;
}

function akrem($array,$key){
    $holding=array();
    foreach($array as $k => $v){
        if($key!=$k){
            $holding[$k]=$v;
        }
    }    
    return $holding;
}

$lunch = array('sandwich' => 'cheese', 'cookie'=>'oatmeal','drink' => 'tea','fruit' => 'apple');
echo '<pre>';
print_r($lunch);
$lunch=arem($lunch,'apple');
print_r($lunch);
$lunch=akrem($lunch,'sandwich');
print_r($lunch);
echo '</pre>';
?>

(remove 9's in email)

down

developer at i-space dot org ¶

22 years ago

remember that array_slice returns an array with the current element. you must use array_slice($array, $index+1) if you want to get the next elements.

down

s0i0m at dreamevilconcepts dot com ¶

16 years ago

Using the varname function referenced from the array_search page, submitted by dcez at land dot ru. I created a multi-dimensional array splice function. It's usage is like so:

$array['admin'] = array('blah1', 'blah2');
$array['voice'] = array('blah3', 'blah4');
array_cut('blah4', $array);

...Would strip blah4 from the array, no matter where the position of it was in the array ^^ Returning this...

Array ( [admin] => Array ( [0] => blah1 [1] => blah2 ) [voice] => Array ( [0] => blah3 ) ) 

Here is the code...

<?php

  function varname ($var)
  {
    // varname function by dcez at land dot ru
    return (isset($var)) ? array_search($var, $GLOBALS) : false;
  }

  function array_cut($needle, $haystack)
  {
    foreach ($haystack as $k => $v)
    {
      for ($i=0; $i<count($v); $i++)
        if ($v[$i] === $needle)
        {
          return array_splice($GLOBALS[varname($haystack)][$k], $i, 1);
          break; break;
        }
    }

?>

Check out dreamevilconcept's forum for more innovative creations!

down

Benjamin Sonntag ¶

1 year ago

The documentation doesn't say it, but if LENGTH is ZERO, then the result is an empty array [].

down

kansey ¶

9 years ago

To save the sort order of a numeric index in the array. Version php =>5.5.26
/*
Example
*/

$arr = array( "1" =>2, "2" =>3 , "3" =>5 );

print_r(array_slice($arr,1,null,true));

/*
Result

Array
(
[2] => 3
[3] => 5
)
*/

down

andreasblixt (at) msn (dot) com ¶

19 years ago

<?php
    // Combines two arrays by inserting one into the other at a given position then returns the result
    function array_insert($src, $dest, $pos) {
        if (!is_array($src) || !is_array($dest) || $pos <= 0) return FALSE;
        return array_merge(array_slice($dest, 0, $pos), $src, array_slice($dest, $pos));
    }
?>

down

-1

Anonymous ¶

18 years ago

If you specify the fourth argument (to not reassign the keys), then there appears to be no way to get the function to return all values to the end of the array. Assigning -0 or NULL or just putting two commas in a row won't return any results.

down

-3

xananax at yelostudio dot com ¶

13 years ago

<?php
/**
 * Reorders an array by keys according to a list of values.
 * @param array $array the array to reorder. Passed by reference
 * @param array $list the list to reorder by
 * @param boolean $keepRest if set to FALSE, anything not in the $list array will be removed.
 * @param boolean $prepend if set to TRUE, will prepend the remaining values instead of appending them
 * @author xananax AT yelostudio DOT com
 */
function array_reorder(array &$array,array $list,$keepRest=TRUE,$prepend=FALSE,$preserveKeys=TRUE){
    $temp = array();
    foreach($list as $i){
        if(isset($array[$i])){
            $tempValue = array_slice(
                $array,
                array_search($i,array_keys($array)),
                1,
                $preserveKeys
            );
            $temp[$i] = array_shift($tempValue);
            unset($array[$i]);
        }
    }
    $array = $keepRest ?
        ($prepend? 
            $array+$temp
            :$temp+$array
        )
        : $temp;
}

/** exemple ** /
$a = array(
    'a'    =>    'a',
    'b'    =>    'b',
    'c'    =>    'c',
    'd'    =>    'd',
    'e'    =>    'e'
);
$order = array('c','b','a');

array_reorder($a,$order,TRUE);
echo '<pre>';
print_r($a);
echo '</pre>';
/** exemple end **/
?>

down

-2

aflavio at gmail dot com ¶

17 years ago

/**
    * Remove a value from a array
    * @param string $val
    * @param array $arr
    * @return array $array_remval
    */
    function array_remval($val, &$arr)
    {
          $array_remval = $arr;
          for($x=0;$x<count($array_remval);$x++)
          {
              $i=array_search($val,$array_remval);
              if (is_numeric($i)) {
                  $array_temp  = array_slice($array_remval, 0, $i );
                $array_temp2 = array_slice($array_remval, $i+1, count($array_remval)-1 );
                $array_remval = array_merge($array_temp, $array_temp2);
              }
          }
          return $array_remval;
    }

$stack=Array('apple','banana','pear','apple', 'cherry', 'apple');
array_remval("apple", $stack);

//output: Array('banana','pear', 'cherry')

down

-2

Mr. P ¶

16 years ago

Note that offset is not the same thing as key. Offset always starts at 0, while keys might be any number.



So this:



<?php print_r(array_slice(array(0 => 0, 5 => 5, 13 => 13),1)); ?>



will result in this:

Array

(

    [0] => 5

    [1] => 13

)

down

-3

aexchecker at yahoo dot com ¶

17 years ago

<?php
/**
 * @desc
 * Combines two arrays by inserting one into the other at a given position then
 * returns the result.
 *
 * @since   2007/10/04
 * @version v0.7 2007/10/04 18:47:52
 * @author  AexChecker <AexChecker@yahoo.com>
 * @param   array $source
 * @param   array $destination
 * @param   int [optional] $offset
 * @param   int [optional] $length
 * @return  array
 */
function array_insert($source, $destination, $offset = NULL, $length = NULL) {
    if (!is_array($source) || empty($source)) {
        if (is_array($destination) && !empty($destination)) {
            return $destination;
        }
        return array();
    }
    if (is_null($offset)) {
        return array_merge($destination, $source);
    }
    $offset = var2int($offset);
    if (is_null($length)) {
        if ($offset === 0) {
            return array_merge($source, array_slice($destination, 1));
        }
        if ($offset === -1) {
            return array_merge(array_slice($destination, 0, -1), $source);
        }
        return array_merge(
            array_slice($destination, 0, $offset),
            $source,
            array_slice($destination, ++$offset)
        );
    }
    if ($offset === 0) {
        return array_merge($source, array_slice($destination, $length));
    }
    $destination_count = count($destination);
    $length = var2int($length);
    if ($offset > 0) {
        if ($destination_count - $offset < 1) {
            return array_merge($destination, $source);
        }
    } else{
        if (($t = $destination_count + $offset) < 1) {
            return array_merge($source, $destination);
        }
        $offset = $t;
    }
    if ($length > 0) {
        $length+= $offset;
    } elseif ($length < 0 && !($length * -1 < $destination_count)) {
        return $source;
    } else {
        $length = $offset;
    }
    return array_merge(
        array_slice($destination, 0, $offset),
        $source,
        array_slice($destination, $length)
    );
}
?>

down

-2

bishop ¶

19 years ago

Sometimes you need to pick certain non-integer and/or non-sequential keys out of an array. Consider using the array_pick() implementation below to pull specific keys, in a specific order, out of a source array:

<?php

$a = array ('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4);
$b = array_pick($a, array ('d', 'b'));

// now:
// $a = array ('a' => 1, 'c' => '3');
// $b = array ('d' => 4, 'b' => '2');

function &array_pick(&$array, $keys)
{
    if (! is_array($array)) {
        trigger_error('First parameter must be an array', E_USER_ERROR);
        return false;
    }

    if (! (is_array($keys) || is_scalar($keys))) {
        trigger_error('Second parameter must be an array of keys or a scalar key', E_USER_ERROR);
        return false;
    }

    if (is_array($keys)) {
        // nothing to do
    } else if (is_scalar($keys)) {
        $keys = array ($keys);
    }

    $resultArray = array ();
    foreach ($keys as $key) {
        if (is_scalar($key)) {
            if (array_key_exists($key, $array)) {
                $resultArray[$key] = $array[$key];
                unset($array[$key]);
            }
        } else {
            trigger_error('Supplied key is not scalar', E_USER_ERROR);
            return false;
        }
    }

    return $resultArray;
}

?>

down

-4

delew ¶

13 years ago

just a little tip.
to preserve keys without providing length: use NULL

array_slice($array, $my_offset, NULL, true);

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