Sorting an Array in PHP

By: David Sklar Emailed: 1728 times Printed: 2329 times    

Latest comments
By: rohit kumar - how this program is work
By: Kirti - Hi..thx for the hadoop in
By: Spijker - I have altered the code a
By: ali mohammed - why we use the java in ne
By: ali mohammed - why we use the java in ne
By: mizhelle - when I exported the data
By: raul - no output as well, i'm ge
By: Rajesh - thanx very much...
By: Suindu De - Suppose we are executing

You want to sort an array in a specific way.

To sort an array using the traditional definition of sort, use sort():

$states = array('Delaware', 'Pennsylvania', 'New Jersey');
sort($states);

To sort numerically, pass SORT_NUMERIC as the second argument to sort( ).

$scores = array(1, 10, 2, 20);
sort($scores, SORT_NUMERIC);

This resorts the numbers in ascending order (1, 2, 10, 20) instead of lexicographical order (1, 10, 2, 20).

The sort() function doesn't preserve the key/value association between elements; instead, entries are reindexed starting at 0 and going upward. (The one exception to this rule is a one-element array; its lone element doesn't have its index reset to 0. This is fixed as of PHP 4.2.3.)

To preserve the key/value links, use asort( ). The asort( ) function is normally used for associative arrays, but it can also be useful when the indexes of the entries are meaningful:

$states = array(1 => 'Delaware', 'Pennsylvania', 'New Jersey');
asort($states);

while (list($rank, $state) = each($states)) {
    print "$state was the #$rank state to join the United States\n";

}

Use natsort( ) to sort the array using a natural sorting algorithm. Under natural sorting, you can mix strings and numbers inside your elements and still get the right answer.

$tests = array('test1.php', 'test10.php', 'test11.php', 'test2.php');
natsort($tests);

The elements are now ordered: 'test1.php', 'test2.php', 'test10.php', and 'test11.php'. With natural sorting, the number 10 comes after the number 2; the opposite occurs under traditional sorting. For case-insensitive natural sorting, use natcasesort( ).

To sort the array in reverse order, use rsort( )or arsort( ), which is like rsort( ) but also preserves keys. There is no natrsort( ) or natcasersort( ). You can also pass SORT_NUMERIC into these functions.


PHP Home | All PHP Tutorials | Latest PHP Tutorials

Sponsored Links

If this tutorial doesn't answer your question, or you have a specific question, just ask an expert here. Post your question to get a direct answer.



Bookmark and Share

Comments(1)


1. View Comment

query:sorting date wise,and diplaying only resent submitted string or text like that plz put an example for that

View Tutorial          By: ramakanth at 2011-08-23 06:49:02

Your name (required):


Your email(required, will not be shown to the public):


Your sites URL (optional):


Your comments:



More Tutorials by David Sklar
Find Difference between two dates in PHP
Reading .CSV file in PHP
Appending One Array to Another in PHP
Removing Duplicate Elements from an Array in PHP
Sorting an Array in PHP
Iterating Through an Array in PHP
Password protecting a page in PHP
Deleting Cookies in PHP
Reading Cookie Values in PHP
Setting cookies in PHP
Encrypting and decrypting in PHP
GDBM, NDBM, DB2, DB3, DBM, and CDB Databases in PHP
Using Text-File Databases in PHP
Upload and Download files with FTP in PHP
Extract files from a .zip file using PHP

More Tutorials in PHP
PHP code to import from CSV file to MySQL
PHP code to write to a CSV file from MySQL query
PHP code to write to a CSV file for Microsoft Applications
Convert XML to CSV in PHP
Password must include both numeric and alphabetic characters - Magento
PHP file upload (Large Files)
PHP file upload prompts authentication for anonymous users
PHP file upload with IIS on windows XP/2000 etc
Error: Length parameter must be greater than 0
Multiple File Upload in PHP using IFRAME
Resume or Pause File Uploads in PHP
Exception in module wampmanager.exe at 000F15A0 in Windows 8
Handling file locks in PHP
HTML table output using Nested for loops in PHP
Count occurrences of a character in a String in PHP

More Latest News
Most Viewed Articles (in PHP )
isset() function in PHP
Handling BLOB in PHP and MySQL
Parent: child process exited with status 3221225477 -- Restarting
Installing PHP 5.x with Apache 2.x on HP UX 11i and configuring PHP 5.x with Oracle 9i
Function to return number of digits of an integer in PHP
History and origin of PHP
.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
public, protected, and private Properties in PHP
Polymorphism in PHP
Input Validation in PHP
Using Cookies in PHP
Opening a Remote File in PHP
Reading Cookie Values in PHP
Get the next working day in PHP
Get the first and last day of the month in PHP
Most Emailed Articles (in PHP)
Different versions of PHP - History and evolution of PHP
The new keyword and constructors in PHP
preg_replace() and preg_replace_callback() in PHP
Iterating Through an Array in PHP
Appending One Array to Another in PHP
Decrypting files using GnuPG (GPG) via PHP
Setting up PHP in Windows 2003 Server IIS7, and WinXP 64
Running different websites on different versions of PHP in Windows 2003 & IIS6 platform
Warning: session_start(): open .... failed - PHP error
Malware: global $ob_starting;
Function to sort array by elements and count of element in PHP
Error: Length parameter must be greater than 0
Password must include both numeric and alphabetic characters - Magento
PHP code to import from CSV file to MySQL
PHP code to write to a CSV file for Microsoft Applications