PHP - Manual: array_unshift

2024-12-30

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array_unshift

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

array_unshift — 在数组开头插入一个或多个单元

说明

array_unshift(array &$array, mixed ...$values): int

array_unshift() 将传入的单元插入到 array 数组的开头。注意单元是作为整体被插入的，因此传入单元将保持同样的顺序。所有的数值键名将修改为从零开始重新计数，所有的文字键名保持不变。

注意:
重置数组中的内部指针，指向第一个元素。

参数

array: 输入的数组。
values: 插入的变量。

返回值

返回 array 数组新的单元数目。

更新日志

版本	说明
7.3.0	现在可以只用一个参数来调用，之前至少需要两个参数。

范例

示例 #1 array_unshift() 例子


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

以上例程会输出：

Array
(
    [0] => apple
    [1] => raspberry
    [2] => orange
    [3] => banana
)

参见

array_shift() - 将数组开头的单元移出数组
array_push() - 将一个或多个单元压入数组的末尾（入栈）
array_pop() - 弹出数组最后一个单元（出栈）

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User Contributed Notes 12 notes

down

181

sergei at gmx dot net ¶

14 years ago


You can preserve keys and unshift an array with numerical indexes in a really simple way if you'll do the following:


<?php

$someArray=array(224=>'someword1', 228=>'someword2', 102=>'someword3', 544=>'someword3',95=>'someword4');


$someArray=array(100=>'Test Element 1 ',255=>'Test Element 2')+$someArray;

?>



now the array looks as follows:


array(

100=>'Test Element 1 ',

255=>'Test Element 2'

224=>'someword1',

228=>'someword2',

102=>'someword3',

544=>'someword3',

95=>'someword4'

);

down

rsmith_NOSPAM_ at _NOSPAM_unitec dot ac dot nz ¶

19 years ago


array_merge() will also reindex (see array_merge() manual entry), but the '+' operator won't, so...


<?php

$arrayone=array("newkey"=>"newvalue") + $arrayone;

?>



does the job.

down

Anonymous ¶

10 years ago


Sahn's example almost works but has a small error. Try it like this if you need to prepend something to the array without the keys being reindexed and/or need to prepend a key value pair, you can use this short function: 

<?php 
function array_unshift_assoc(&$arr, $key, $val) 
{ 
    $arr = array_reverse($arr, true); 
    $arr[$key] = $val; 
    return = array_reverse($arr, true); 
} 
?>

down

daniel at smallboxcms dot com ¶

7 years ago


Anonymous' associative version wasn't working for me, but it did with this small tweak:

function array_unshift_assoc(&$arr, $key, $val) 
{ 
    $arr = array_reverse($arr, true); 
    $arr[$key] = $val; 
    $arr = array_reverse($arr, true); 
    return $arr;
}

down

Richard Akindele ¶

6 years ago


Another way to tack something to the beginning of an array is with array_merge().

$plans = array('AARP'=>'Senior', 'AAA'=>'Automobile Club');

$plans = array_merge(array("BAR"=>"Best Available Rate"),  $plans);

down

php at electricsurfer dot com ¶

18 years ago


even simpler unshifting of a reference !
<?php
/**
 * @return int
 * @param $array array
 * @param $value mixed
 * @desc Prepend a reference to an element to the beginning of an array. Renumbers numeric keys, so $value is always inserted to $array[0]
 */
function array_unshift_ref(&$array, &$value)
{
   $return = array_unshift($array,'');
   $array[0] =& $value;
   return $return;
}
?>

down

robert dot wills at fuzzbrain dot uklinux dot net ¶

20 years ago


Actually this problem with the keys getting reindexed only happens when the keys are numerical:

<?php

$a = array("f"=>"five", "s" =>"six", "t" =>
        "twenty");

print_r($a);
echo "\n";
foreach($a as $key=>$val)
{
    echo "k: $key v: $val \n";
}

array_unshift($a, "zero");
print_r($a);
echo "\n";
foreach($a as $key=>$val)
{
    echo "k: $key v: $val \n";
}
?>

Array
(
    [f] => five
    [s] => six
    [t] => twenty
)

k: f v: five
k: s v: six
k: t v: twenty
Array
(
    [0] => zero
    [f] => five
    [s] => six
    [t] => twenty
)

k: 0 v: zero
k: f v: five
k: s v: six
k: t v: twenty

down

amschroeder at gmail dot com ¶

15 years ago


This becomes a nice little problem if you index your arrays out of order (while manually sorting).  For example:


<?php

$recordMonths[3] = '8/%/2006';

$recordMonths[4] = '7/%/2004';

$recordMonths[0] = '3/%/2007';

$recordMonths[1] = '2/%/2007';

$recordMonths[5] = '12/%/2000';

$recordMonths[6] = '11/%/2000';

$recordMonths[7] = '10/%/2000';

$recordMonths[2] = '1/%/2007';


for($i = 0; $i < count($recordMonths); $i++)

{

    $singleMonth = $recordMonths[$i];

    echo "singleMonth: $singleMonth <br />";

}

array_unshift($recordMonths,'%');

for($i = 0; $i < count($recordMonths); $i++)

{

    $singleMonth = $recordMonths[$i];

    echo "singleMonth: $singleMonth <br />";

}

?>



Produces:


singleMonth: 3/%/2007

singleMonth: 2/%/2007

singleMonth: 1/%/2007

singleMonth: 8/%/2006

singleMonth: 7/%/2004

singleMonth: 12/%/2000

singleMonth: 11/%/2000

singleMonth: 10/%/2000

singleMonth: %

singleMonth: 8/%/2006

singleMonth: 7/%/2004

singleMonth: 3/%/2007

singleMonth: 2/%/2007

singleMonth: 12/%/2000

singleMonth: 11/%/2000

singleMonth: 10/%/2000

singleMonth: 1/%/2007 


It reindexes them based on the order they were created.  It seems like if an array has all numeric indexes, then it should reindex them based on the order of their index.  Just my opinion...

down

sahn at hmc dot edu ¶

20 years ago


If you need to prepend something to the array without the keys being reindexed and/or need to prepend a key value pair, you can use this short function:


<?php

function array_unshift_assoc(&$arr, $key, $val)

{

    $arr = array_reverse($arr, true);

    $arr[$key] = $val;

    $arr = array_reverse($arr, true);

    return count($arr);

}

?>

down

-3

chris dot NoThxSpam dot given at hp dot com ¶

18 years ago


If you need to change the name of a key without changing its position in the array this function may be useful.


<?php

function array_key_change($Old, $New, $In, $NewVal=NULL) {

        $Temp = array();

        while(isset($Temp[$Old]) == false) {

                list($k, $v) = each($In);

                $Temp[$k] = $v;

                unset($In[$k]);

        }

        if($NewVal == NULL) {

                $NewVal = $Temp[$Old];

        }

        unset($Temp[$Old]);

        $Temp = array_reverse($Temp);

        $In = array_merge(array($New=>$NewVal), $In);

        while(list($k,$v) = each($Temp)) {

                $In = array_merge(array($k=>$v), $In);

        }

        return($In);

}

?>

down

-6

John Brooking ¶

16 years ago


I had a need tonight to convert a numeric array from 1-based to 0-based, and found that the following worked just fine due to the "side effect" of renumbering:


<?php

   array_unshift( $myArray, array_shift( $myArray ));

?>

down

-11

lagroue ¶

18 years ago


Last version of PHP deprecated unshifting of a reference.

You can use this function instead :


<?php

function array_unshift1 (& $ioArray, $iValueWrappedInAnArray) {

    $lNewArray = false;

    foreach (array_keys ($ioArray) as $lKey)

        $lNewArray[$lKey+1] = & $ioArray[$lKey];

    $ioArray = array (& $iValueWrappedInAnArray[0]);

    if ($lNewArray)

        foreach (array_keys ($lNewArray) as $lKey)

             $ioArray[] = & $lNewArray[$lKey];

    return count($ioArray);

}


// before last PHP (now generates a deprecation warning)

array_unshift ($a, &$v);

// since last PHP (caution, there is a wrapping array !!)

array_unshift1 ($a, array (&$v));

?>

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官方地址：https://www.php.net/manual/en/function.array-unshift.php

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PHP官方手册 - 互联网笔记

array_unshift

说明

参数

返回值

更新日志

范例

参见

User Contributed Notes 12 notes