Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.
COURSE of the MONTH
11 days, 1 hour left to enrollBecome a Premium Member and unlock a new, free course in leading technologies each month.
Solved
PHP: Sort array by value, keep keys
Posted on 2011-09-20
How can I sort my array by values, while maintaining keys?
My code below sorts by the keys, not the values:
I want this:
My code below sorts by the keys, not the values:
<pre><?php
$zzz=array();
$zzz['b']='Banana';
$zzz['z']='Cherry';
$zzz['m']='Apple';
$zzz['a']='Durian';
asort($zzz);
$zzz = array_merge(array('a'=>'Apple'),$zzz);
print_r($zzz);
?>
</pre>
I want this:
Array
(
[m] => Apple
[b] => Banana
[z] => Cherry
[a] => Durian
)
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
2
2 Comments
Hi hankknight,
I've had a quick look and from what I can see the asort() function is the correct one to use, but I belive the array_merge line you are using afterwards is affecting the order of your array.
For example, try performing another asort() after the array_merge() as follows:
This gives the following (note the second print_r statement outputs the array in your desired order.
If this is in fact the case then I would suggest performing a single asort() after your have finished running any required array_merge() functions.
I hope this helps with your problem.
Cheers
Matt
I've had a quick look and from what I can see the asort() function is the correct one to use, but I belive the array_merge line you are using afterwards is affecting the order of your array.
For example, try performing another asort() after the array_merge() as follows:
$zzz=array();
$zzz['b']='Banana';
$zzz['z']='Cherry';
$zzz['m']='Apple';
$zzz['a']='Durian';
asort($zzz);
$zzz = array_merge(array('a'=>'Apple'),$zzz);
echo '<pre>'; print_r($zzz); echo '</pre>';
asort($zzz);
echo '<pre>'; print_r($zzz); echo '</pre>';
This gives the following (note the second print_r statement outputs the array in your desired order.
Array
(
[a] => Durian
[m] => Apple
[b] => Banana
[z] => Cherry
)
Array
(
[m] => Apple
[b] => Banana
[z] => Cherry
[a] => Durian
)
If this is in fact the case then I would suggest performing a single asort() after your have finished running any required array_merge() functions.
I hope this helps with your problem.
Cheers
Matt
Just to provide a bit more information for you, the PHP manual page for array_merge() states the following:
"Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one."
"If the input arrays have the same string keys, then the later value for that key will overwrite the previous one."
This would explain the problem.
What I believe is happening is you are first creating the array $zzz and then you are appending this array onto your array('a'=>'Apple') created on line 10.
This is first creating a new array, with a single element who's key is 'a' and value is 'Apple'. The array_merge() is then appending the existing $zzz array onto the end. Leaving 'a'=>'Apple' as the first element in the array. Subsequently, as the documentation states, because your $zzz array has an existing key 'a' who's value is 'Durian' this is overwriting 'a'.
My apologies, I'm struggling to explain it however hopefully it makes some sense to you.
Cheers
Matt
"Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one."
"If the input arrays have the same string keys, then the later value for that key will overwrite the previous one."
This would explain the problem.
What I believe is happening is you are first creating the array $zzz and then you are appending this array onto your array('a'=>'Apple') created on line 10.
This is first creating a new array, with a single element who's key is 'a' and value is 'Apple'. The array_merge() is then appending the existing $zzz array onto the end. Leaving 'a'=>'Apple' as the first element in the array. Subsequently, as the documentation states, because your $zzz array has an existing key 'a' who's value is 'Durian' this is overwriting 'a'.
My apologies, I'm struggling to explain it however hopefully it makes some sense to you.
Cheers
Matt
Featured Post
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
I imagine that there are some, like me, who require a way of getting currency exchange rates for implementation in web project from time to time, so I thought I would share a solution that I have developed for this purpose.
It turns out that Yaho…
Many old projects have bad code, but the budget doesn't exist to rewrite the codebase. You can update this code to be safer by introducing contemporary input validation, sanitation, and safer database queries.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing.
Set up your basic HTML file. Open your form tag and set the method and action attributes.:
(CODE)
Set up your first few inputs one for the name and …
Suggested Courses
Course of the Month11 days, 1 hour left to enroll
770 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.