array_slice
Note: If replacement is not an array, it will be typecast to one (i.e. (array) $parameter). This may result in unexpected behavior when using an object replacement .
Example :
class A()
{
private $a;
private $b;
public function __construct()
{
$this->a = "foo";
$this->b = "bar";
}
}
$array = array();
array_splice($array, 0, 0, new A());
print_r($array);
Outputs :
Array : Array
{
[0] => foo
[1] => bar
}
Solution : Enforce the array() on the object.
array_splice($array, 0, 0, array(new Object());
Source : http://bugs.php.net/bug.php?id=44485
array_splice
(PHP 4, PHP 5)
array_splice — 배열의 일부를 삭제하고, 그 위치에 다른 내용을 대체한다
설명
array array_splice
( array $input
, int $offset
[, int $length
[, array $
replacement
]] )
array_splice()는 input 배열로부터 offset 과 length 에 정해진대로 배열원소를 제거하고, 매개변수가 주어진다면 replacement 배열의 배열원소로 그부분을 대체한다. 그리고 확장된 배열원소를 포함하는 배열을 반환한다.
offset 이 양수이면 삭제될 부분의 시작은 input 배열의 시작에서부터의 offset에서 시작된다. offset 이 음수이면 input 배열의 끝에서부터의 옵셋 수에서 시작된다.
length 가 생략되면, offset 에서 배열의 끝까지의 모든 원소를 삭제된다. length 가 주어지고 양수이면, 그 수만큼의 원소가 삭제될것이다. length 가 주어지고 음수이면, 삭제되는 부분의 끝은 배열의 끝에서부터 그 수만큼의 원소가 될것이다. 팁: replacement 가 주어져있고 offset 에서 배열 끝까지의 모든 원소를 삭제하려면 length 매개변수에 count($input)을 사용하도록 한다.
replacement 배열이 주어지면, 제거된 원소들은 이 배열의 원소들로 대체된다. offset 과 length 가 아무것도 삭제되지 않도록 주어지면, replacement 배열의 원소들을 offset 에 의해 설정된 위치에 끼워넣는다. 팁: 한개의 원소만 대체되는 경우이고 그 원소가 배열자체가 아니라면 array()를 넣을 필요는 없다.
다음은 동일한 결과를 낸다:
| array_push($input, $x, $y) | array_splice($input, count($input), 0, array($x, $y)) |
| array_pop($input) | array_splice($input, -1) |
| array_shift($input) | array_splice($input, -1) |
| array_unshift($input, $x, $y) | array_splice($input, 0, 0, array($x, $y)) |
| $a[$x] = $y | array_splice($input, $x, 1, $y) |
제거된 원소로 구성된 배열을 반환한다.
Example#1 array_splice() 예제코드
<?php
$input = array ("red", "green", "blue", "yellow");
array_splice ($input, 2);
// $input is now array ("red", "green")
$input = array ("red", "green", "blue", "yellow");
array_splice ($input, 1, -1);
// $input is now array ("red", "yellow")
$input = array ("red", "green", "blue", "yellow");
array_splice ($input, 1, count($input), "orange");
// $input is now array ("red", "orange")
$input = array ("red", "green", "blue", "yellow");
array_splice ($input, -1, 1, array("black", "maroon"));
// $input is now array ("red", "green",
// "blue", "black", "maroon")
$input = array ("red", "green", "blue", "yellow");
array_splice ($input, 3, 0, "purple");
// $input is now array ("red", "green",
// "blue", "purple", "yellow");
?>
add a note
User Contributed Notesarray_splice
madmax at max-worlds dot net
23-Sep-2008 06:23
23-Sep-2008 06:23
loushou - life dot 42 at gmail dot com
27-Jul-2008 04:39
27-Jul-2008 04:39
i miss posted the actual function...
here is the real one lol
<?php
function q_sort(&$Info, $Index, $Left, $Right)
{
echo "memory usage <b>".memory_get_usage()."</b><br/>\n";
$L_hold = $Left;
$R_hold = $Right;
$Pivot = $Left;
$PivotValue = $Info[$Left];
while ($Left < $Right)
{
while (($Info[$Right][$Index] >= $PivotValue[$Index]) && ($Left < $Right))
$Right--;
if ($Left != $Right)
{
$Info[$Left] = $Info[$Right];
$Left++;
}
while (($Info[$Left][$Index] <= $PivotValue[$Index]) && ($Left < $Right))
$Left++;
if ($Left != $Right)
{
$Info[$Right] = $Info[$Left];
$Right--;
}
}
$Info[$Left] = $PivotValue;
$Pivot = $Left;
$Left = $L_hold;
$Right = $R_hold;
if ($Left < $Pivot)
q_sort($Info, $Index, $Left, $Pivot-1);
if ($Right > $Pivot)
q_sort($Info, $Index, $Pivot+1, $Right);
}
?>
Francis
27-Apr-2008 12:27
27-Apr-2008 12:27
Do you need to sort a 2D array on just one of its variables while trying to preserve somewhat the original order?
<?php
function sort_2d_array($array, $position, $order = "ASC"){
if (!is_array($array)) return $array;
if (count($array) < 2) return $array;
$new = array($array[0]);
for ($cnt = 1; $cnt <= count($array) - 1; $cnt++){
$stop = 0;
$splice = 0;
for ($newcnt = 0; $newcnt <= count($new) - 1; $newcnt++){
if ($stop == 0){
if ($order == "ASC")
if ($array[$cnt][$position] < $new[$newcnt][$position]){
$splice = $newcnt;
$stop = 1;
} // splice position for ASC
if ($order == "DESC")
if ($array[$cnt][$position] > $new[$newcnt][$position]){
$splice = $newcnt;
$stop = 1;
} // splice position for DESC
} // stop vying for position
} // cycle through new array to find position
if ($stop == 0){
$new[] = $array[$cnt];
} else {
array_splice($new, $splice, 0, array($array[$cnt]));
} // splice into new array while keeping somewhat the original order
} // cycle through original array
return $new;
} // sort_2d_array
?>
Application Example: In-House Search Engine
Here we are trying to find the word apple in the website by sort of the most recent occurances first, but the number of occurances first.
We've already sorted the mysql output by the date desc and have counted the no of occurances and have placed those in an array for the final query.
I've used this function to further sort the occurances but somewhat keep the original mysql sort order.
Key
[0] Record number
[0] Record ID
[1] Source Table
[2] No of Occurances Pinged
---------------------------
[0]
[0] 24530
[1] Blogs
[2] 1
[1]
[0] 24400
[1] Blogs
[2] 1
[2]
[0] 24240
[1] Blogs
[2] 4
[3]
[0] 243422
[1] Classifieds
[2] 1
[4]
[0] 243100
[1] Classifieds
[2] 1
After running...
<?php
sort_2d_array($array, 2, "DESC");
?>
We have...
[0]
[0] 24240
[1] Blogs
[2] 4
[1]
[0] 24530
[1] Blogs
[2] 1
[2]
[0] 24400
[1] Blogs
[2] 1
[3]
[0] 243422
[1] Classifieds
[2] 1
[4]
[0] 243100
[1] Classifieds
[2] 1
Might be useful to someone...
nash0r
29-Feb-2008 01:04
29-Feb-2008 01:04
array_splice($input, -1) / array_slice($input, 1) equivalent to array_shift($input) ?????
Try this:
<?php
$input = array('key1' => array('deep1' => 'Value'), 'key2' => array('deep2' => 'Value'), 'key3' => array('deep3' => 'Value'));
$foo_splice = array_splice($input, -1);
$foo_shift = array_shift($input);
echo "<pre>".print_r($foo_splice, true)."</pre>";
echo "<pre>".print_r($foo_shift, true)."</pre>";
?>
Output:
Array
(
[key3] => Array
(
[deep3] => Value
)
)
Array
(
[deep1] => Value
)
pauljamescampbell at gmail dot com
06-Feb-2008 06:46
06-Feb-2008 06:46
Here's my own take on an array slice method that preserves keys from an associative array.
<?php
/**
* Array slice function that preserves associative keys
*
* @function associativeArraySlice
*
* @param Array $array Array to slice
* @param Integer $start
* @param Integer $end
*
* @return Array
*/
function associativeArraySlice($array, $start, $end) {
// Method param restrictions
if($start < 0) $start = 0;
if($end > count($array)) $end = count($array);
// Process vars
$new = Array();
$i = 0;
// Loop
foreach($array as $key => $value) {
if($i >= $start && $i < $end) {
$new[$key] = $value;
}
$i++;
}
return($new);
}
?>
saurabhmdh at yahoo dot co dot on
15-Sep-2007 12:29
15-Sep-2007 12:29
for inserting array in 2-d array, according x position, y position
<?php
function add_module_xy($x_loc, $y_loc, $module) {
//identify the column of the modules
switch ($x_loc) {
case 1:
$x = 'left';
break;
case 2:
$x = 'middle';
break;
case 3:
$x = 'right';
break;
default:
throw new Exception("", "Invalid horizontal position $x_loc");
}
$max_y_loc = count($this->module_arrays[$x]) + 1;
if ($y_loc > $max_y_loc) {
//if y location is greater then max array index then add module to last
$y_loc = $max_y_loc;
}
$left = array_slice ($this->module_arrays[$x], 0, $y_loc-1);
$right = array_slice ($this->module_arrays[$x], $y_loc-1);
$insert[0] = $module;
$array = array_merge ($left, $insert, $right);
$this->module_arrays[$x] = $array;
}
?>
mip at ycn dot com
08-Mar-2007 05:37
08-Mar-2007 05:37
Ever wounder what array_splice is doing to your references, then try this little script and see the output.
<?php
$a = "a";
$b = "b";
$c = "c";
$d = "d";
$arr = array();
$arr[] =& $a;
$arr[] =& $b;
$arr[] =& $c;
array_splice($arr,1,0,array($d));
$sec_arr = array();
$sec_arr[] =& $d;
array_splice($arr,1,0,$sec_arr);
$arr[0] = "test"; // should be $a
$arr[3] = "test2"; // should be $b
$arr[1] = "this be d?"; // should be $d
$arr[2] = "or this be d?"; // should be $d
var_dump($arr);
var_dump($a);
var_dump($b);
var_dump($d);
?>
The output will be (PHP 4.3.3):
array(5) {
[0]=>
&string(4) "test"
[1]=>
&string(10) "this be d?"
[2]=>
string(13) "or this be d?"
[3]=>
&string(5) "test2"
[4]=>
&string(1) "c"
}
string(4) "test"
string(5) "test2"
string(10) "this be d?"
So array_splice is reference safe, but you have to be careful about the generation of the replacement array.
have fun, cheers!
ahigerd at stratitec dot com
24-Jan-2007 06:07
24-Jan-2007 06:07
A comment on array_merge mentioned that array_splice is faster than array_merge for inserting values. This may be the case, but if your goal is instead to reindex a numeric array, array_values() is the function of choice. Performing the following functions in a 100,000-iteration loop gave me the following times: ($b is a 3-element array)
array_splice($b, count($b)) => 0.410652
$b = array_splice($b, 0) => 0.272513
array_splice($b, 3) => 0.26529
$b = array_merge($b) => 0.233582
$b = array_values($b) => 0.151298
bdjumakov at gmail dot com
31-Aug-2006 12:11
31-Aug-2006 12:11
Someone might find this function usefull. It just takes a given element from the array and moves it before given element into the same array.
<?php
function array_move($which, $where, $array)
{
$tmp = array_splice($array, $which, 1);
array_splice($array, $where, 0, $tmp);
return $array;
}
?>
Paul
11-Feb-2006 10:06
11-Feb-2006 10:06
In PHP 4.3.10, at least, it seems that elements that are inserted as part of the replacement array are inserted BY REFERENCE (that is, as though with the =& rather than = assignment operation). So if your replacement array contains elements that references to variables that you can also access via other variable name, then this will be true of the elements in the final array too.
In particular, this means that it is safe to use array_splice() on arrays of objects, as you won't be creating copies of the objects (as it is so easy to do in PHP 4).
gerry-03 at 4warding dot com
09-Feb-2006 07:35
09-Feb-2006 07:35
For anybody who is wondering... jrhardytwothousandtwo's trick for inserting an element using array_splice, will also work with multi-dimensional arrays if you do the following:
<?php
function array_insert(&$input, $offset, $replacement){
array_splice($input, $offset, 0, 0);
$input[$offset] = $replacement;
}
?>
I'm not sure if this (or a derivative of it) will solve other problems that I have seen just about everybody on here trying to solve. But apart from it's hackish nature, it works well for me.
ajd at cloudiness dot com
06-Dec-2005 06:35
06-Dec-2005 06:35
weikard's function below is useful but it will still strip keys from array elements where the key is an integer, whether or not it is in a string:
<?php
function array_insert (&$array, $position, $insert_array) {
$first_array = array_splice ($array, 0, $position);
$array = array_merge ($first_array, $insert_array, $array);
}
$f = array("three" => "zzz", "3" => "yyy");
$a = array("4.0" => "zzzz", "four" => "yyyy");
array_insert($a,0,$f);
var_dump($a);
// array(4) { ["three"]=> string(3) "zzz" [0]=> string(3) "yyy" ["4.0"]=> string(4) "zzzz" ["four"]=> string(4) "yyyy" }
?>
weikard at gmx dot de
15-Sep-2005 05:53
15-Sep-2005 05:53
You cannot insert with array_splice an array with your own key. array_splice will always insert it with the key "0".
<?php
// [DATA]
$test_array = array (
row1 => array (col1 => 'foobar!', col2 => 'foobar!'),
row2 => array (col1 => 'foobar!', col2 => 'foobar!'),
row3 => array (col1 => 'foobar!', col2 => 'foobar!')
);
// [ACTION]
array_splice ($test_array, 2, 0, array ('rowX' => array ('colX' => 'foobar2')));
echo '<pre>'; print_r ($test_array); echo '</pre>';
?>
[RESULT]
Array (
[row1] => Array (
[col1] => foobar!
[col2] => foobar!
)
[row2] => Array (
[col1] => foobar!
[col2] => foobar!
)
[0] => Array (
[colX] => foobar2
)
[row3] => Array (
[col1] => foobar!
[col2] => foobar!
)
)
But you can use the following function:
function array_insert (&$array, $position, $insert_array) {
$first_array = array_splice ($array, 0, $position);
$array = array_merge ($first_array, $insert_array, $array);
}
<?php
// [ACTION]
array_insert ($test_array, 2, array ('rowX' => array ('colX' => 'foobar2')));
echo '<pre>'; print_r ($test_array); echo '</pre>';
?>
[RESULT]
Array (
[row1] => Array (
[col1] => foobar!
[col2] => foobar!
)
[row2] => Array (
[col1] => foobar!
[col2] => foobar!
)
[rowX] => Array (
[colX] => foobar2
)
[row3] => Array (
[col1] => foobar!
[col2] => foobar!
)
)
[NOTE]
The position "0" will insert the array in the first position (like array_shift). If you try a position higher than the langth of the array, you add it to the array like the function array_push.
csaba at alum dot mit dot edu
13-Aug-2005 02:31
13-Aug-2005 02:31
Appending arrays
If you have an array $a2 whose values you would like to append to an array $a1 then four methods you could use are listed below in order of increasing time. The last two methods took significantly more time than the first two. The most surprising lesson is that using the & incurs a time hit.
<?php
foreach ($a2 as $elem) $a1[]=$elem;
foreach ($a2 as &$elem) $a1[]=$elem;
array_splice ($a1, count($a1), 0, $a2);
$a1 = array_merge($a1, $a2);
?>
Csaba Gabor from Vienna
randomdestination at gmail dot com
22-Jul-2005 01:52
22-Jul-2005 01:52
To split an associative array based on it's keys, use this function:
<?php
function &array_split(&$in) {
$keys = func_get_args();
array_shift($keys);
$out = array();
foreach($keys as $key) {
if(isset($in[$key]))
$out[$key] = $in[$key];
else
$out[$key] = null;
unset($in[$key]);
}
return $out;
}
?>
Example:
<?php
$testin = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4);
$testout =& array_split($testin, 'a', 'b', 'c');
print_r($testin);
print_r($testout);
?>
Will print:
Array
(
[d] => 4
)
Array
(
[a] => 1
[b] => 2
[c] => 3
)
Hope this helps anyone!
gideon at i6developments dot com
17-Jul-2004 09:45
17-Jul-2004 09:45
array_splice dynamically updates the total number of entries into the array. So for instance I had a case where I needed to insert a value into every 4th entry of the array from the back. The problem was when it added the first, because the total number was dynamically updated, it would only add after the 3rd then the 2nd and so one. The solution I found is to track the number of inserts which were done and account for them dynamically.
Code:
<?php
$modarray = array_reverse($mili);
$trig=1;
foreach($modarray as $rubber => $glue) {
if($rubber!="<BR>") {
$i++;
$b++;
if ($i==4) {
$trig++;
if($trig<=2) {
array_splice($modarray,$b,0,"<BR>");
}elseif($trig>=3){
array_splice($modarray,$b+($trig-2),0,"<BR>");
}
$i=0;
};
};
};
$fixarray = array_reverse($modarray);
?>
jtgt at gmx dot de (Richard Lachmann)
16-Jul-2004 09:18
16-Jul-2004 09:18
This function will preserve keys:
<?php
function my_array_splice(&$_arr, $_index, $_long){
$_keys=array_keys($_arr);
$_key=array_search($_index, $_keys);
if ( $_key !== FALSE ){
$_keys=array_splice($_keys, $_key, $_long);
foreach ($_keys as $_key) unset($_arr[$_key]);
}
}
?>
rolandfoxx at yahoo dot com
30-Mar-2004 12:16
30-Mar-2004 12:16
Be careful, array_splice does not behave like you might expect should you try to pass it an object as the replacement argument. Consider the following:
<?php
//Very truncated
class Tree {
var $childNodes
function addChild($offset, $node) {
array_splice($this->childNodes, $offset, 0, $node);
//...rest of function
}
}
class Node {
var $stuff
...
}
$tree = new Tree();
// ...set 2 nodes using other functions...
echo (count($tree->childNodes)); //Gives 2
$newNode = new Node();
// ...set node attributes here...
$tree->addChild(1, $newNode);
echo(count($tree->childNodes)); //Expect 3? wrong!
?>
In this case, the array has a number of items added to it equal to the number of attributes in the new Node object and the values thereof I.e, if your Node object has 2 attributes with values "foo" and "bar", count($tree->childNodes) will now return 4, with the items "foo" and "bar" added to it. I'm not sure if this qualifies as a bug, or is just a byproduct of how PHP handles objects.
Here's a workaround for this problem:
function array_insertobj(&$array, $offset, $insert) {
$firstPart = array_slice($array, 0, $offset);
$secondPart = array_slice($array, $offset);
$insertPart = array($insert);
$array = array_merge($firstPart, $insertPart, $secondPart);
}
Note that this function makes no allowances for when $offset equals the first or last index in the array. That's because array_unshift and array_push work just fine in those cases. It's only array_splice that can trip you up. Obviously, this is kinda tailor-made for arrays with numeric keys when you don't really care what said keys are, but i'm sure you could adapt it for associative arrays if you needed it.
18-Aug-2003 03:57
Want to insert a new value in the middle of the array, without overwriting other elements? Try this.
<?php
$array = array(
0 => 0,
1 => 1,
2 => 2,
3 => 3,
4 => 4,
5 => 5
);
array_splice($array, 3, count($array), array_merge(array('x'), array_slice($array, 3)));
echo '<pre>';
print_r($array);
?>
Output:
Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => x
[4] => 3
[5] => 4
[6] => 5
)
As you can see, the operation add 'X' in the 4th place, pushing everything else to the next key.
kbrown at horizon dot sk dot ca
11-Aug-2003 12:40
11-Aug-2003 12:40
[ Editor's Note: If you're not concerned with the indexes being contiguously numbered (such as for an associative array) then unset($ar[$ind]); will accomplish the same as the code below without requiring splice/splice/merge. If contiguous numbering IS a concern (such as for indexed arrays), you can still save time by using: unset($ar[$ind]); $ar = array_values($ar); ]
Removing elements from arrays
This works better - much quicker
<?php
$ar = array("einstein", "bert", "colin", "descartes", "renoir");
$a = array_slice($ar, 0, $ind);
$b = array_slice($ar, $ind + 1);
$ar = array_merge($a, $b);
?>
plintus at smtp dot ru
14-Apr-2003 01:59
14-Apr-2003 01:59
key-safe:
<?php
function array_kslice ($array, $offset, $length = 0) {
$k = array_slice (array_keys ($array), $offset, $length);
$v = array_slice (array_values ($array), $offset, $length);
for ($i = 0; $i < count ($k); $i ++) $r[$k[$i]] = $v[$i];
return $r;
}
?>
smth like this. hope you like it more than versions above :)
tsunaquake DOESNTLIKESPAM @ wp DOT pl
11-Nov-2002 10:56
11-Nov-2002 10:56
It is possible to use a string instead of offset, eg if you want to deletre the entry $myArray['entry'] then you can simply do it like this:
<?php
array_splice($myArray, 'entry', 1);
?>
Note that you can use unset($myArray['entry']) as well but then, it doesn't enable you to remove more than one entry and it doesn't replace anything in the array, if that's what you intend to do.
18-Jun-2002 07:14
Please note that array_splice() 's second argument is an OFFSET and not an INDEX.
Lets say you want to
$array_of_items = array ('nothing','myitem','hisitem','heritem');
$sid = array_search('myitem',$array_of_items);
echo $sid; /* prints out 1, since index element 1 is "myitem" */
Now, lets say we want to remove that "myitem" from the array:
<?php
$array_of_items = array_splice($array_of_items,(1+$sid),1);
?>
Notice how you have to add a one to the $sid variable? That is because offset item 1 is "nothing" and since $sid is currently 1 (the index of "myitem"), we add 1 more to it to find out
its OFFSET.
DO NOT DO THIS:
$array_of_items = array_splice($array_of_items,$sid,1);
paule at cs dot tamu dot edu
12-Jun-2002 09:59
12-Jun-2002 09:59
to kokos@lac.lviv.ua:
Good point about the code not doing what you expected.
The failure to check for the insert case like you pointed out is not a bug, however. I didn't add code to handle that because the key of such an added index is more or less undefined in an unordered associative array. Put another way, if your array is associative and not auto-indexed, you most likely care enough about your keys to want to set them explicitly.
kokos at lac dot lviv dot ua
08-Jun-2002 02:55
08-Jun-2002 02:55
To paule@cs.tamu.edu :
Sorry, but the fix will still not work properly - when $length=0 (e.g. trying to insert one value) the
$new_array[$key]=$replacement;
would be immediately followed by
$new_array[$key]=$value;
and the $replacement will be lost.
What i was trying to point out in my original post is that $input[$x]=$y is NOT equivalent to array_splice($input, $x, 1, $y) . The equivalence mentioned would be true ONLY when $input is <... ghmm... > "automatically enumerated", having its' keys exactly matching offsets of corresponding elements in the array. But, in general case, keys do not match offsets - perhaps this should be explicitly stated in the Description above.
paule at cs dot tamu dot edu
06-Jun-2002 11:21
06-Jun-2002 11:21
Aiya, I feel silly. The fix for my code above assumes that your values in the associative array are strings. Ignore the fix code in my last post and use this instead:
<?php
if(is_array($replacement))
foreach($replacement as $r_key=>$r_value)
$new_array[$r_key]=$r_value;
elseif($replacement!==NULL)
$new_array[$key]=$replacement;
?>
Sorry again. I feel sheepish. n.n
paule at cs dot tamu dot edu
06-Jun-2002 11:09
06-Jun-2002 11:09
After reading KoKos' post above, I thought that the code I posted right before his should do what he wanted. However, my original post neglected to note the little "Tip" in the documentation above, about a single element replacement.
If one changes the lines in my code above that says:
<?php
if(is_array($replacement))
foreach($replacement as $r_key=>$r_value)
$new_array[$r_key]=$r_value;
?>
to instead say:
<?php
if(is_string($replacement))
$new_array[$key]=$replacement;
elseif(is_array($replacement))
foreach($replacement as $r_key=>$r_value)
$new_array[$r_key]=$r_value;
?>
that will solve the problem.
Sorry for the omission.
kokos at lac dot lviv dot ua
06-Jun-2002 08:26
06-Jun-2002 08:26
It may seem obvious from the above posts, but cost me a bit of
braindamage to figure this out...
Contrary to the equivalence noted on this page
$input[$x] = $y <==> array_splice ($input, $x, 1, $y)
array_splice() will not always work as expected,
even provided that you have only INTEGER keys!
The following code:
$t=array('a','b','c','d','e');
var_dump($t);
<?php
unset($t[0],$t[1],$t[3]);
$t[0]='f';
var_dump($t);
array_splice($t,0,1,'g');
var_dump($t);
?>
Will produce:
array(5) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
[4]=>
string(1) "e"
}
array(3) {
[2]=>
string(1) "c"
[4]=>
string(1) "e"
[0]=>
string(1) "f"
}
array(3) {
[0]=>
string(1) "g"
[1]=>
string(1) "e"
[2]=>
string(1) "f"
}
Note the position of $t[0] in the second call to var_dump().
And of course, array_splice() left it intact, changing $t[2] instead.
This is because it operates the _offset_, not the _index_. :)
I think that "equivalence note" should be considered buggy. ;)))
Best wishes.
KoKos.
paule at cs dot tamu dot edu
26-May-2002 07:02
26-May-2002 07:02
I believe the following is a version of array_slice that solves most of the issues for people that want an associative key offset, rather than an integer.
<?php
function key_array_splice(&$input, $key_ofs, $length=NULL, $replacement=NULL)
{
// Adjust the length if it was negative or not passed
if($length===NULL || $length<0)
$count = $length+count($input);
// Cycle through the array
foreach($input as $key=>$value){
if(!$key_found){
if($key===$key_ofs){
$key_found=true;
if($length!==NULL && $length>=0)
$count=$length;
if(is_array($replacement))
foreach($replacement as $r_key=>$r_value)
$new_array[$r_key]=$r_value;
}else
$new_array[$key]=$value;
}
if($key_found){
if($count>0)
$ret_array[$key]=$value;
else
$new_array[$key]=$value;
}
$count--;
}
// Finish up
$input=$new_array;
return $ret_array;
}
?>
Note that this code needs PHP 4 for the use of the "===" and "!==" operators.
jrhardytwothousandtwo at yahoo dot com
14-Feb-2002 11:54
14-Feb-2002 11:54
A reference is made to INSERT'ing into an array here with array_splice, however its not explained very well. I hope this example will help others find what took me days to research.
<?php
$original_array = array(1,2,3,4,5);
$insert_into_key_position = 3;
$item_to_insert = "blue";
$returned = array_splice($original_array, $insert_into_key_position, 0, $item_to_insert);
// $original_array will now show:
// 1,2,3,blue,4,5
?>
Remember that you are telling the array to insert the element into the KEY position. Thus the elements start with key 0 and so on 0=>1, 1=>2, 2=>3, 3=>blue, 4=>4, 5=>5. And walla, you've inserted. I can't say if this is of any value for named keys, or multidimensional arrays. However it does work for single dimensional arrays.
$returned should be an empty array as nothing was returned. This would have substance if you were doing a replace instead.
leingang AT math DOT rutgers DOT edu
15-Jan-2002 07:32
15-Jan-2002 07:32
array_splice resets the internal pointer of $input. In fact, many array functions do this. Caveat programmor!