Select 基于来自另一个数组的二进制值的一个或多个数组值

Question

I have two arrays. COLORS and STATUS (based on a binary string).

$binary_string = '001'; // Can be any combination of 0 and 1 (000,111,100,etc)
$colors = array('red','green','blue');
$status = str_split($binary_string);

I need to return the active/selected color(s) based on the string. In the example, I should get "blue". What is the easiest way to achieve this in PHP? An example, please.

Thanks!

Answer 1

Simply you need loop over status array which binary string representation of color if find 1 will set color to corresponding color in RGB and just exit the loop!

<?php
$binary_string = '001';
$colors = array('red','green','blue');
$status = str_split($binary_string);

$color = '';
foreach ($status as $i => $bin) {
    if($bin==='1'){
        $color = $colors[$i];
        break;
    }
}
echo $color;//blue
?>

Answer 2

I think you want something like this:

<?php
$binary_string = '101'; // Can be any combination of 0 and 1 (000,111,100,etc)
$colors = array('red','green','blue');
$status = str_split($binary_string);
$final_colors = "";
for ($i=0; $i< 3; $i++) {
    SWITCH($i) {
        case 0:
         $final_colors .= $status[$i] ? 'red, ' : '';
         break;
        case 1:
         $final_colors .= $status[$i] ? 'green, ' : '';
         break;
        case 2:
         $final_colors .= $status[$i] ? 'blue' : '';
         break;
    }
}

echo $final_colors;