Swapping variables in PHP

I’ve created a short and sweet PHP function swap() to exchange/swap the values of two PHP variables. Here it is in action:

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$cat = "cat";
$dog = "dog";


echo "$cat goes meow and $dog goes woof"; //dog goes meow and cat goes woof

function swap(&$var1, &$var2) {
    $tmp = $var1;
    $var1 = $var2;
    $var2 = $tmp;


If you’re running this function a lot (e.g. millions of iterations) it’s actually faster to just perform the swap without the function. For example:

for($i = 0; $i < 10000000; $i++) {
    $tmp = $var1;
    $var1 = $var2;
    $var2 = $tmp;

Thanks @dnaslave for providing efficiency feedback! :]

Matrix like background

<div id="background"></div>

var int=self.setInterval(function(){updateBackground()},100);
function updateBackground()
    var content = "";
    for(var i=0;i<2048;i++){
      content += Math.round(Math.random()).toString();

#background {
background: black;
color: #0F0;

Sort HTML table using jQuery

I’ve put together a script that allows you to make any HTML table sortable by clicking on the table headings. See the example below:

Name Age
John Smith 18
Ashley Washington 26
Patrick Green 19

To use, download ljSortable.min.js and include it near the bottom of your page (after the table) and give your table an id of “ljSortable”. For example:

<table id="ljSortable">
<td>John Smith</td>
<td>Ashley Washington</td>
<td>Patrick Green</td>
<script src="http://liljosh.com/ljSortable.min.js"></script>

Javascript Format Phone Number Function

This is a Javascript function to format any 10 digit phone number into the following format: (555) 555-5555

* Created by http://liljosh.com
* Formats a phone number to be in (555) 555-5555 format
function phoneFormat(phone) {
  phone = phone.replace(/[^0-9]/g, '');
  phone = phone.replace(/(\d{3})(\d{3})(\d{4})/, "($1) $2-$3");
  return phone;

Example usage:

<div id="phoneNumber">555-555-5555</div>
  var phone = $("#phoneNumber").text();
  phone = phoneFormat(phone);

See demo: