PHP随机选择非零变量

Question

Say I have 5 variables:

$a=2
$b=0
$c=7
$d=0
$e=3

I want to choose one variable randomly that is not zero, do something with it, then set that chosen variable to zero.

Note that I want to know which variable is chosen, for example if I got 7 I want to also know that it's $c, so that I can change its value after reading it.

What is the simplest way to do that?

I was thinking take all variables then randomize first, then check if it's zero, but it doesn't scale well if I had more variables and more zeroes.

Answer 1

First, I would recommend crafting an array that contains all of the target values. You can then filter the zero values out with array_filter(). Then select a random index from the filtered array with array_rand().

You then have a random non-zero value assigned to $filtered_array[$random_index], which you are free to assign to an independent variable, or echo out to the DOM.

<?php

$a = 2;
$b = 0;
$c = 7;
$d = 0;
$e = 3;

$array = [$a, $b, $c, $d, $e];
$filtered_array = array_filter($array);
$random_index = array_rand($filtered_array);

echo $filtered_array[$random_index]; // 2, 7 or 3

This can be seen working here.

Hope this helps! :)