JSON（PHP）中的反向键值数组

Question

I have a key value array in php like this

[1]=>"something"
[2]=>"somethingelse"
[4]=>"this"

Now i would like to export this as json, reverse the array, but keep the indexes. So the json format would look something like

{
    "4":"this",
    "2":"somethingelse"
    "1":"something"
}

Is there an easy way to accomplish this (without parsing the json manually)?

Answer 1

You need to preserve the keys in the array_reverse to get this working.

<?php
$arr=array(1=>"something",2=>"somethingelse",4=>"this");
echo json_encode(array_reverse($arr,true),true);

OUTPUT :

{"4":"this","2":"somethingelse","1":"something"}

Answer 2

You can use array_flip() for this.

$array = array(1 => 'one', 2 => 'two');

$arrayFlipped = array_flip($array);

/*
$arrayFlipped:

Array
(
   [one] => 1
   [two] => 2
)
*/

Answer 3

$reverse = array_reverse($array, true);
$json = json_encode ($reverse);

Answer 4

If you wish to reverse the order of the array, it's best to do so before conversing it to JSON. You can do this using the array_reverse() function, you will need to set the second parameter to TRUE to preserve the indexes.

<?php
$myArray = Array(
    1 => "something",
    2 => "somethingelse",
    4 => "this"
);

$myJSON = json_encode( array_reverse( $myArray, true ) );

print_r( $myJSON );
?>

Answer 5

$arr = array(
    1 => "something",
    2 => "somethingelse",
    4 => "this"
);

$arr = array_reverse($arr,true); // true!

echo json_encode($arr);

Answer 6

array_reverse

Example:

$arr = array("apple","banana","orange");
$reversed = array_reverse($arr,true);
echo json_encode($reversed);