<?php
function image()
{
	$min = 1; //The first number one of your images has
	$max = 3; //The highest number you image has
	$number = rand($min, $max);
	$url = "http://website.com/~ub/_ubr/wp-content/themes/ubcmi/images/icons/image" . $number . ".jpg"; //change the url to your url //for the image split the url into two parts by separating in between the image name and //extension
	echo "<img src='$url'>";
}
 ?>

<?php
function image()
{
	$min = 1; //The first number one of your images has
	$max = 3; //The highest number you image has
	$number = rand($min, $max);
	$url = "http://website.com/~ub/_ubr/wp-content/themes/ubcmi/images/icons/" . $number . ".jpg"; //change the url to your url //for the image split the url into two parts by separating in between the image name and //extension
	echo "<img src='$url'>";
}
 ?>

<?php
function image()
    {
    $min = 1; //The first number one of your images has
    $max = 3; //The highest number you image has
    $num = rand($min, $max);
    //set picture names
    $pic[1]='firstpic.jpg';
    $pic[2]='secondpic.jpg';
    $pic[3]='another_name.jpg';
    //end of setting picture names
  $url = "http://website.com/~ub/_ubr/wp-content/themes/ubcmi/images/icons/" .$pic[$num]."; //change the url to your url //for the image split the url into two parts by separating in between the image name and //extension
	echo "<img src='$url'>";
}
 ?>