How to show 3 random divs on 3 random places - php

Question

How to show 3 random divs on 3 random places
I have 6 potentionaly places for divs.
All 6 divs need to be hidden for now.
When page load I need to show only 3 random divs, and another 3 divs need to be hidden.
<?php
$divs = array('<div id="divFirst">First Div</div>','<div id="divFirst">Second Div</div>','<div id="divFirst">Third Div</div>');
// Array with 3 random keys from $divs
$randKeys = array_rand($divs, 2);
//echo $divs[$randKeys[0]]; // First random div
//echo $divs[$randKeys[1]]; // Second random div
//echo $divs[$randKeys[2]]; // 3rd div
//shuffle($divs);
?>
<div class="text">This is a simple text</div>
<?php echo $divs[$randKeys[0]]; ?>
<div class="text">This is a simple text</div>
<?php echo $divs[$randKeys[1]]; ?>
<div class="text">This is a simple text</div>
<?php echo $divs[$randKeys[2]]; ?>
<div class="text">This is a simple text</div>
<?php echo $divs[$randKeys[1]]; ?>
<div class="text">This is a simple text</div>
<?php echo $divs[$randKeys[0]]; ?>
<div class="text">This is a simple text</div>
<?php echo $divs[$randKeys[2]]; ?>

Answer 1

Look at this: $randKeys = array_rand($divs, 2);
The second parameter specifies the number of items you want out of the array. You want 3, but you told it you want 2.
Then you're doing <?php echo $divs[$randKeys[2]]; ?> That is, trying to print the third element from the array (i.e. arrays start counting at 0). But you only have 2 elements in the array now.
Also, it would make more sense to only keep the contents of the divs in your array. Then you can do like:
$randKeys = array_rand($divs, 6);
//because you want 3 shown, 3 hidden, thus 6
for($i=0; $i<6; $i++)
{
$style='display: block';
if($i>=3)
{
//we hide the last 3
$style='display: none';
}
echo "<div id='div_$i' style='$style'>" . $divs[$randKeys[$i]] . "</div>";
}
That solves the problem mentioned in the comments about your div ids not being unique.
However, in order to pick 6, you need to actually have 6 elements in the $divs array because the docs for array_rand() state:
Trying to pick more elements than there are in the array will result in an E_WARNING level error, and NULL will be returned.