How to sort associative array

Question

I want to sort the key of the following array. I use ksort(), but i don't know how to use it. Any idea?

<?php
        $a = array(
                'kuy' => 'kuy',
                'apple' => 'apple',
                'thida' => 'thida',
                'vanna' => 'vanna',
                'ravy' => 'ravy'
              );

        $b = ksort($a);
        echo "<pre>";
        print_r($b);
        echo "</pre>";

Answer 1

ksort() sorts the array itself and does not create a sorted copy

$a = array(
  'kuy'   => 'kuy',
  'apple' => 'apple',
  'thida' => 'thida',
  'vanna' => 'vanna',
  'ravy'  => 'ravy'
);

ksort($a);
echo "<pre>";
print_r($a);
echo "</pre>";

Answer 2

ksort does not return an array. It just sorts the original array, and returns bool "Returns TRUE on success or FALSE on failure. "

So your sorted array is $a, not $b. see it here : http://codepad.org/zMTFTPGf

Answer 3

You find your answer there: http://php.net/manual/de/function.ksort.php

Use it just like:

ksort($a);

then $a is sorted.

Answer 4

If you don't want to preserve the original order of $a then use :-

ksort($a);
print_r($a);

If you want to keep $a, but also want a sorted version use:-

$b = $a;
ksort($b);
print_r($b);

As said in my comment the manual page makes it quite clear. http://www.php.net/manual/en/function.ksort.php

Answer 5

ksort returns boolean value and sort the original array so you should print $a instead of $b because $b is a boolean value returned by the ksort which is either true or false depending on the result of ksort

ksort($a);    
print_r($a);

Answer 6

ksort returns a boolean - whether the sort succeeded or not. It sorts the array in-place - where it changes the array variable rather than returns a sorted copy.

Try:

ksort($a);
print_r($a);

Answer 7

ksort通过引用获取其参数并直接对其进行修改，返回值仅表示成功或失败。

Answer 8

ksort returns a boolean on whether it was successful or not, it doesn't return another sorted array. It changes the original array.

print_r($a);

Answer 9

As Felix said look at the documentation. you can also look at the example here