If you need to find odd numbers in an array in php it’s very easy. You just use the “%” command. eg.

if ($num % 2) {
echo “$num is odd”;
} else {
echo “$num is even”;
}

I think what it basically does is divides the number by 2 and if it’s not a whole number it renders it returns it as odd.

Here’s how this code can be very tidy and useful:

The following code can be helpful if you are doing a php foreach repeater to produce a table and you want to use an alternating css class on every second row.

Step 1:
Place a $count outside your foreach loop.

$count=”0″;

Step 2:
Create your rows with the alternating css classes

echo “<tr class =’”;
$count++;
if ($count % 2) {
echo “rowclass1″; }
else {
echo “rowclass2″;
}
echo “‘>”;
echo “<td>Your row Content</td></tr>”;

That’s it, each row will have a different css class and it saves you having to do each row manually!

This is some code I wrote to generate a drop down box with all the countries listed in it,  that will preselect the right country if you post the country to it from a previous page. Really helpful if you use it as a control. I have it permanently in my PHP includes folder and just call it any time I need it.eg.:

 <select name=”example”>

<? include ‘../inc/countries.php’ ?>

</select>

Here is countries.php

(more…)

To round any number or integer values in PHP it’s simple.number_format is useful function that you can use. It takes 2 values: the $NumberYouWantToFormat and then the number of decimal places you want it to be formatted to. 

$total = 34.128252 echo number_format($total, 2); 

This will produce:

34.13 

It’s a simple thing, but really useful.