Skip to main content

Sorting Arrays in PHP…Some Sorting Functions

Some Sorting Functions in PHP

Oh, so you want to learn how to sort arrays in PHP. But, did I tell you that PHP has inbuilt sorting functions. Well, I’ve now! So this post will not be anything but discussion on those sorting functions. Let’s look at them without wasting any more time.

sort() Function

This function, as the name suggest can be used to sort single dimensional arrays in ascending order. PHP is intelligent enough to also sort string arrays very well besides numerical arrays.

//gives array(6) { [0]=> int(1) [1]=> int(11) [2]=>
//     int(38) [3]=> int(56) [4]=> int(65) [5]=> int(99) }

The optional second argument if specified can be SORT_REGULAR (default), SORT_NUMERIC or SORT_STRING. It can be used to explicitly tell the sort function the way you want the arrays to be sorted. Most commonly numerical arrays sorted with the SORT_STRING (second parameter) will give totally different results.

//gives array(6) { [0]=> int(1) [1]=> int(11) [2]=> 
//    int(2) [3]=> int(38) [4]=> int(61) [5]=> int(99) }

Sorting with this function is case-sensitive, capital case characters come before lowercase characters.

On sorting an array:

//gives array(2) { [0]=> string(1) "Z" [1]=> string(1) "a" }

The sort() function has a matching function rsort(), which does sorting in reverse order.

asort() Function

When we have associative arrays having string indices (AKA keys), we cannot use the sort() function instead assort() function should be used.

This function sorts an array according to the values of the elements. It is same as the sort() function except that it can sort associative arrays.

//gives array(3) { ["mar"]=> int(33) ["feb"]=> 
//    int(41) ["jan"]=> int(45) }

Again, its matching reverse sort function exists, arsort()

ksort() Function

It is also used for sorting associative arrays but in a different way. As you know associative arrays have two set of values, the ‘key’ and the ‘elements’. assort() function sorts the arrays according to the values of the elements. Guess what? This function sorts associative arrays according to the value of the ‘keys’ or string indices.

//gives array(3) { ["feb"]=> int(41) ["jan"]=> 
//    int(45) ["mar"]=> int(33) }

Its matching reverse sorting function is krsort() which does sorting in the same way but in the reverse order.

Previous Articles:

Popular posts from this blog

Fix For Toshiba Satellite "RTC Battery is Low" Error (with Pictures)

RTC Battery is Low Error on a Toshiba Satellite laptop "RTC Battery is Low..." An error message flashing while you try to boot your laptop is enough to panic many people. But worry not! "RTC Battery" stands for Real-Time Clock battery which almost all laptops and PCs have on their motherboard to power the clock and sometimes to also keep the CMOS settings from getting erased while the system is switched off.  It is not uncommon for these batteries to last for years before requiring a replacement as the clock consumes very less power. And contrary to what some people tell you - they are not rechargeable or getting charged while your computer or laptop is running. In this article, we'll learn everything about RTC batteries and how to fix the error on your Toshiba Satellite laptop. What is an RTC Battery? RTC or CMOS batteries are small coin-shaped lithium batteries with a 3-volts output. Most laptops use

The Best Way(s) to Comment out PHP/HTML Code

PHP supports various styles of comments. Please check the following example: <?php // Single line comment code (); # Single line Comment code2 (); /* Multi Line comment code(); The code inside doesn't run */ // /* This doesn NOT start a multi-line comment block /* Multi line comment block The following line still ends the multi-line comment block //*/ The " # " comment style, though, is rarely used. Do note, in the example, that anything (even a multi-block comment /* ) after a " // " or " # " is a comment, and /* */ around any single-line comment overrides it. This information will come in handy when we learn about some neat tricks next. Comment out PHP Code Blocks Check the following code <?php //* Toggle line if ( 1 ) {      // } else {      // } //*/ //* Toggle line if ( 2 ) {      // } else {      // } //*/ Now see how easy it is to toggle a part of PHP code by just removing or adding a single " / " from th

Pong Game in HTML & JavaScript (Updated)

HTML Pong Game Gameplay Pong is one of the first games that many people from the 80s or 90s had played as children. Lots of people know it as a simple arcade game but what they probably do not know is that this simple game helped establish the video game industry! In this post, we'll be making our version of a very simple but fully working Pong game in HTML, CSS and JavaScript. Basic Game Structure Games, however simple or complex they may be, follow the basic Game Loop design as shown in the chart below. Event-oriented game engines usually encapsulate the design and provide you with an event mechanism for handling various parts like the input, update, and rendering but internally the basic design is being followed. Pong Game Loop For our Game Loop, we'll be using JavaScript setInterval so that the game code remains asynchronous and separate. As you may have guessed a while (or any other loop) will freeze the page. For our input, we'll be using onmousemove event to update t