Order Array

[karl-93]

I ordered an array:

 

code:

for ($ x = 0; $ x <count ($ arr); $ x + +) {

for ($ y = 0; $ y <count ($ arr); $ y + +) {

if ($ arr [$ x] <$ arr [$ y]) {

$ temp = $ arr [$ x];

$ arr [$ x] = $ arr [$ y];

$ arr [$ y] = $ temp;

}

}

}

 

 

The code works ... now I have to print the array, formatted as follows:

 

[5] => -9

 

I have to keep the original key and returning the key and value according to the following format described above.

 

How should I do?

 

 

Thank you!

 

 

Ps.

I can not use sorting functions.

[cpd]

 

If the code above is your actual code you could of used the sort() function; I appreciate you said you can't but never the less.

 

To print the code use:

 

foreach($arr as $k => $v) 
  echo $k . " => " . $v . "<br />";

 

This sentence

 

I have to keep the original key and returning the key and value according to the following format described above.

 

makes absolutely no sense to me.

[Barand]

Ps.

I can not use sorting functions.

 

Why not?

 

Show us this array and how you want it sorted

 

echo '<pre>',print_r($array, true),'</pre>';

[karl-93]

I can not use sorting functions because the tutorial says not to.

 

Here is the array:

 

 

$arr=array(55,32,3,89,88,-13,155,485,-77,40,91,13,77,44,-511,2);

 

This sentence:

I have to keep the original key and returning the key and value according to the following format described above.

 

It means that I have to print this way:

 

 

14 => -511

8 => -77

5 => -13

15 => 2

...

7 => 485

 

I do not print well:

 

0 => -511

1 => -77

2 => -13

3 => 2

...

15 => 485

 

 

How should I do?

[Jessica]

By tutorial you mean homework, right?

 

 

[karl-93]

Yes!

 

I'm no expert in the programming language PHP. I'm following this tutorial to learn how to program and tutorial there are tasks to be performed.

 

 

how should I do to solve my problem(homework)?

 

Thanks!

[karl-93]

Help me! :'(

 

 

Thanks!

[cpd]

You would need to store the key value pair somewhere else. I would then use the usort() function to make a comparison and have PHP sort it.

 

For example, if you rework the array to form another array in the format array(0 => "key:value", 1 => "key:value") you can use:

usort($array, function($a, $B) {
   $a = explode(":", $a);
   $b = explode(":", $B);
   if($a[1] < $b[1]) {
       return -1;
   } elseif($a[1] == $b[1]) {
       return 0;
   } else {
       return 1;
   }
});

Edited January 14, 2013 by cpd

[kicken]

Sort an array of keys based on their values, then after that array of keys is sorted, grab the original values for each key.  

 

Untested, but rough idea:

$keys = array_keys($arr);
for ($i=0; $i<count($keys); $i++){
  for ($n=0; $n<$count($keys); $n++){
     $a = $arr[$keys[$i]];
     $b = $arr[$keys[$n]];
     if ($a < $B){
        $tmp=$keys[$n];
        $keys[$n] = $keys[$i];
        $keys[$i] = $tmp;
     }
  }
}

$final = array();
foreach ($keys as $key){
  $final[$key]=$arr[$key];
}

print_r($final);

 

[Christian F.]

Karl-93: If you start anew and use the foreach () loop instead of for (), I think you'll find that this task becomes a lot easier. At least, getting to the key for any given value will be.

The rest you've solved already.

[karl-93]

I solved. Thanks!