Array slice function that works with associative arrays (keys):
function array_slice_assoc($array,$keys) {
return array_intersect_key($array,array_flip($keys));
}
(PHP 4, PHP 5, PHP 7, PHP 8)
array_slice — Extract a slice of the array
array_slice() returns the sequence of elements
from the array array as specified by the
offset and length
parameters.
arrayThe input array.
offset
If offset is non-negative, the sequence will
start at that offset in the array.
If offset is negative, the sequence will
start that far from the end of the array.
Note:
The
offsetparameter denotes the position in the array, not the key.
length
If length is given and is positive,
then the sequence will have up to that many elements in it.
If the array is shorter than the length,
then only the available array elements will be present.
If length is given and is negative then the
sequence will stop that many elements from the end of the array.
If it is omitted, then the sequence will have everything
from offset up until the end of the
array.
preserve_keysNote:
array_slice() will reorder and reset the integer array indices by default. This behaviour can be changed by setting
preserve_keystotrue. String keys are always preserved, regardless of this parameter.
Returns the slice. If the offset is larger than the size of the array, an empty array is returned.
Example #1 array_slice() examples
<?php
$input = array("a", "b", "c", "d", "e");
$output = array_slice($input, 2); // returns "c", "d", and "e"
$output = array_slice($input, -2, 1); // returns "d"
$output = array_slice($input, 0, 3); // returns "a", "b", and "c"
// note the differences in the array keys
print_r(array_slice($input, 2, -1));
print_r(array_slice($input, 2, -1, true));
?>The above example will output:
Array
(
[0] => c
[1] => d
)
Array
(
[2] => c
[3] => d
)
Example #2 array_slice() and one-based array
<?php
$input = array(1 => "a", "b", "c", "d", "e");
print_r(array_slice($input, 1, 2));
?>The above example will output:
Array
(
[0] => b
[1] => c
)
Example #3 array_slice() and array with mixed keys
<?php
$ar = array('a'=>'apple', 'b'=>'banana', '42'=>'pear', 'd'=>'orange');
print_r(array_slice($ar, 0, 3));
print_r(array_slice($ar, 0, 3, true));
?>The above example will output:
Array
(
[a] => apple
[b] => banana
[0] => pear
)
Array
(
[a] => apple
[b] => banana
[42] => pear
)
Array slice function that works with associative arrays (keys):
function array_slice_assoc($array,$keys) {
return array_intersect_key($array,array_flip($keys));
}If you want an associative version of this you can do the following:
function array_slice_assoc($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
)<?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 $ret;
}based on worldclimb's arem(), here is a recursive array value removal tool that can work with multidimensional arrays.
function remove_from_array($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 $holding; // only pass back the holding array if we didn't find the value
}array_slice can be used to remove elements from an array but it's pretty simple to use a custom function.
One day array_remove() might become part of PHP and will likely be a reserved function name, hence the unobvious choice for this function's names.
<?
function arem($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($lunch);
echo '</pre>';
?>
(remove 9's in email)remember that array_slice returns an array with the current element. you must use array_slice($array, $index+1) if you want to get the next elements.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!The documentation doesn't say it, but if LENGTH is ZERO, then the result is an empty array [].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
)
*/<?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));
}
?><?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 **/
?>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.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
)<?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)
);
}
?>/**
* 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')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;
}
?>