array_flip
(PHP 4, PHP 5, PHP 7, PHP 8)
array_flip — 配列のキーと値を反転する
説明
array_flip() は、配列を反転して返します。
すなわち、array のキーが値となり、
array の値がキーとなります。
array の値は有効なキーを必要とすることに注意してください。
すなわち、キーは、int または
string である必要があります。ある値が間違った型である場合、
警告が出力され、問題のこのキー/値の組は結果には含まれません。
ある値が複数回出現した場合、最後のキーがその値として使用され、 その他の値は失われます。
パラメータ
array-
反転を行うキー/値の組。
戻り値
反転した配列を返します。
例
例1 array_flip() の例
<?php
$input = array("oranges", "apples", "pears");
$flipped = array_flip($input);
print_r($flipped);
?>上の例の出力は以下となります。
Array
(
[oranges] => 0
[apples] => 1
[pears] => 2
)
例2 array_flip() の例 : 衝突
<?php
$input = array("a" => 1, "b" => 1, "c" => 2);
$flipped = array_flip($input);
print_r($flipped);
?>上の例の出力は以下となります。
Array
(
[1] => b
[2] => c
)
＋add a note
User Contributed Notes 16 notes
Final ¶
13 years ago
I find this function vey useful when you have a big array and you want to know if a given value is in the array. in_array in fact becomes quite slow in such a case, but you can flip the big array and then use isset to obtain the same result in a much faster way.
Tony H ¶
11 years ago
This function is useful when parsing a CSV file with a heading column, but the columns might vary in order or presence:
<?php
$f = fopen("file.csv", "r");
/* Take the first line (the header) into an array, then flip it
so that the keys are the column name, and values are the
column index. */
$cols = array_flip(fgetcsv($f));
while ($line = fgetcsv($f))
{
// Now we can reference CSV columns like so:
$status = $line[$cols['OrderStatus']];
}
?>
I find this better than referencing the numerical array index.
Bob Ray ¶
7 years ago
array_flip will remove duplicate values in the original array when you flip either an associative or numeric array. As you might expect it's the earlier of two duplicates that is lost:
<?php
$a = array('one', 'two', 'one');
print_r($a);
$b = array_flip($a);
print_r($b);
?>
Result:
array(3) {
[0] => string(3) "one"
[1] => string(3) "two"
[2] => string(3) "one"
}
array(2) {
'one' => int(2)
'two' => int(1)
}
This may be good or bad, depending on what you want, but no error is thrown.
Prabhas Gupte ¶
9 years ago
array_flip() does not retain the data type of values, when converting them into keys. :(
<?php
$arr = array('one' => '1', 'two' => '2', 'three' => '3');
var_dump($arr);
$arr2 = array_flip($arr);
var_dump($arr2);
?>
This code outputs this:
array(3) {
["one"]=>
string(1) "1"
["two"]=>
string(1) "2"
["three"]=>
string(1) "3"
}
array(3) {
[1]=>
string(3) "one"
[2]=>
string(3) "two"
[3]=>
string(5) "three"
}
It is valid expectation that string values "1", "2" and "3" would become string keys "1", "2" and "3".
pinkgothic at gmail dot com ¶
17 years ago
In case anyone is wondering how array_flip() treats empty arrays:
<?php
print_r(array_flip(array()));
?>
results in:
Array
(
)
I wanted to know if it would return false and/or even chuck out an error if there were no key-value pairs to flip, despite being non-intuitive if that were the case. But (of course) everything works as expected. Just a head's up for the paranoid.
snaury at narod dot ru ¶
20 years ago
When you do array_flip, it takes the last key accurence for each value, but be aware that keys order in flipped array will be in the order, values were first seen in original array. For example, array:
[1] => 1
[2] => 2
[3] => 3
[4] => 3
[5] => 2
[6] => 1
[7] => 1
[8] => 3
[9] => 3
After flipping will become:
(first seen value -> first key)
[1] => 7
[2] => 5
[3] => 9
And not anything like this:
(last seen value -> last key)
[2] => 5
[1] => 7
[3] => 9
In my application I needed to find five most recently commented entries. I had a sorted comment-id => entry-id array, and what popped in my mind is just do array_flip($array), and I thought I now would have last five entries in the array as most recently commented entry => comment pairs. In fact it wasn't (see above, as it is the order of values used). To achieve what I need I came up with the following (in case someone will need to do something like that):
First, we need a way to flip an array, taking the first encountered key for each of values in array. You can do it with:
$array = array_flip(array_unique($array));
Well, and to achieve that "last comments" effect, just do:
$array = array_reverse($array, true);
$array = array_flip(array_unique($array));
$array = array_reverse($array, true);
In the example from the very beginning array will become:
[2] => 5
[1] => 7
[3] => 9
Just what I (and maybe you?) need. =^_^=
kjensen at iaff106 dot com ¶
12 years ago
I needed a way to flip a multidimensional array and came up with this function to accomplish the task. I hope it helps someone else.
<?php
function multi_array_flip($arrayIn, $DesiredKey, $DesiredKey2=false, $OrigKeyName=false) {
$ArrayOut=array();
foreach ($arrayIn as $Key=>$Value)
{
// If there is an original key that need to be preserved as data in the new array then do that if requested ($OrigKeyName=true)
if ($OrigKeyName) $Value[$OrigKeyName]=$Key;
// Require a string value in the data part of the array that is keyed to $DesiredKey
if (!is_string($Value[$DesiredKey])) return false;
// If $DesiredKey2 was specified then assume a multidimensional array is desired and build it
if (is_string($DesiredKey2))
{
// Require a string value in the data part of the array that is keyed to $DesiredKey2
if (!is_string($Value[$DesiredKey2])) return false;
// Build NEW multidimensional array
$ArrayOut[$Value[$DesiredKey]][$Value[$DesiredKey2]]=$Value;
}
// Build NEW single dimention array
else $ArrayOut[$Value[$DesiredKey]][]=$Value;
}
return $ArrayOut;
}//end multi_array_flip
?>
Hayley Watson ¶
7 years ago
Don't use this function for filtering or searching an array - PHP already has functions for exactly those purposes. If nothing else, array_flip will trash the array's elements if they're anything other than integers or non-decimal-integer strings.
Anonymous ¶
12 years ago
Similarly, if you want the last value without affecting the pointer, you can do:
<?php
$array = array("one","two","three");
echo next($array); // "two"
$last = array_pop(array_keys(array_flip($array)));
echo $last; // "three"
echo current($array); // "two"
?>
Hayley Watson ¶
15 years ago
Finding the longest string in an array?
<?php
function longest_string_in_array($array)
{
$mapping = array_combine($array, array_map('strlen', $array));
return array_keys($mapping, max($mapping));
}
?>
Differences are obvious: returns an array of [i]all[/i] of the longest strings, instead of just picking one arbitrarily. Doesn't do the stripslashing or magic stuff because that's another job for for another function.
dan at aoindustries dot com ¶
15 years ago
From an algorithmic efficiency standpoint, building an entire array of lengths to then sort to only retrieve the longest value is unnecessary work. The following should be O(n) instead of O(n log n). It could also be:
<?php
function get_longest_value($array) {
// Some don't like to initialize, I do
$longest = NULL;
$longestLen = -1;
foreach ($array $value) {
$len = strlen($value);
if($len>$longestLen) {
$longest = $value;
$longestLen = $len;
}
}
$longest = str_replace("\r\n", "\n", $longest);
if (get_magic_quotes_gpc()) { return stripslashes($longest); }
return $longest;
}
?>
Ahammar Yassine ¶
6 years ago
<?php
$arr = array('one' => ['four' => 4], 'two' => '2', 'three' => '3');
var_dump($arr);
$arr2 = array_flip($arr);
var_dump($arr2);
?>
The above example will output:
array(3) {
["one"]=>
array(1) {
["four"]=>
int(4)
}
["two"]=>
string(1) "2"
["three"]=>
string(1) "3"
}
Warning: array_flip(): Can only flip STRING and INTEGER values! in /root/test.php on line 4
array(2) {
[2]=>
string(3) "two"
[3]=>
string(5) "three"
}
grimdestripador at hotmail dot com ¶
10 years ago
<?php
function array_flip_into_subarray($input){
$output = array();
foreach ($input as $key=>$values){
foreach ($values as $value){
$output[$value][] = $key;
}
}
return $output;
}
mmulej at gmail dot com ¶
3 years ago
If you don't want to lose duplicates, and you're ok, with having the values in the flipped array in an array as well, you may use this:
PHP 7.4 - ^8
<?php
function array_flip_safe(array $array) : array
{
return array_reduce(array_keys($array), function ($carry, $key) use (&$array) {
$carry[$array[$key]] ??= [];
$carry[$array[$key]][] = $key;
return $carry;
}, []);
}
?>
PHP 7.0 - ^7.3 (Time to upgrade to PHP 8 ^^)
<?php
function array_flip_safe(array $array) : array
{
return array_reduce(array_keys($array), function ($carry, $key) use (&$array) {
$carry[$array[$key]] = $carry[$array[$key]] ?? [];
$carry[$array[$key]][] = $key;
return $carry;
}, []);
}
?>
PHP 5.4 - ^5.6 (Just don't)
<?php
function array_flip_safe(array $array)
{
return array_reduce(array_keys($array), function ($carry, $key) use (&$array) {
if (!isset($carry[$array[$key]])
$carry[$array[$key]] = [];
$carry[$array[$key]][] = $key;
return $carry;
}, []);
}
?>
info at sabastore dot net ¶
8 years ago
note :: array_flip is a changer for key and value and a auto unique like array_unique :
<?php
/*
sabastore
*/
$intArray1 = array(-4,1,1,3);
print_r($intArray1);
$intArray1 = array_flip($intArray1);
print_r($intArray1);
?>