array_rand

[Mutley]

How do I select a number randomly? I tried this:

 

<?php
$a = array('10','20','30','40');
$b = array_rand($a);

echo $b;
?>

 

I want it to echo "10" or "20" etc but instead it comes out with numbers between 1-4?

[ignace]

<?PHP

$a = array('10', '20', '30', '40');
$b = $a[rand(0, count($a) - 1)]; // use mt_rand() to use the Mersenne Twister

echo $b;

?>

[xenophobia]

<?php

$a = array('10', '20', '30', '40');

$b = rand(0, sizeof($a)-1);

 

echo $a[$b];

?>

[boo_lolly]

i'd do it like this:

<?php
        $a = array('10', '20', '30', '40');
        shuffle($a);
        $b = $a[0];
        echo $b ."<br />\n";
?>

[Barand]

If you checked the manual you'd see that array_rand() returns KEY not value

 

<?php
$a = array('10','20','30','40');
echo $a[array_rand($a)];
?>