How can I random key in loop? - php

Question

My code is like this :
<?php
$colors = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$i = 0;
foreach ($colors as $color) {
?>
<div class="<?php echo $i==0 ? 'active' : '' ?>">
<?php echo $color.'-'.$i; ?>
</div>
<?php
$i++;
}
?>
When code above executed, the first class will active
I want to make it to be random
So when executed, Any class can be active
For example when I run, class on first div will active
When I run again, the class on the third div is active.
So it's random
How can I do it?

Answer 1

just use rand(0,count($colors)-1) it will give one number between your limit
<?php
$colors = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$i = 0;
$rand =rand(0,count($colors)-1);
foreach ($colors as $color) {
?>
<div class="<?=($i== $rand)? 'active' : '' ?>">
<?php echo $color.'-'.$i; ?>
</div>
<?php
$i++;
}
?>

Answer 2

Try this:
<?php
$colors = ["a" => "red", "b" => "green", "c" => "blue", "d" => "yellow"];
$i = 0;
$activeIndex = array_rand($colors);
foreach ($colors as $key => $color) {
echo "<div class=\"" . (($key == $activeIndex) ? 'active' : '') . "\">$color-$i</div>";
$i++;
}
?>
It uses php's array_rand() function to get the key of the array to select as active.

Answer 3

Use the rand() function.
$random = rand(0,5)
This would return a random int between 0 and 5. For more information google rand() php

Answer 4

Either you use
array_rand($colors, 1)
or you use
mt_rand(0, count($colors));
See manual for more information: http://php.net/manual/en/function.array-rand.php & http://php.net/mt_rand

Answer 5

The following code will return random values.
$colors = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$colors = array_rand($colors, 1);
echo $colors;