<?php

$color = null;
$weather = 'sunny';

// using if-elseif-else
if ($weather == 'sunny') {
    $color = 'blue';
} elseif ($weather == 'cloudy') {
    $color = 'grey';
} else {
    $color = 'error: invalid weather';
}
echo $color . PHP_EOL;

// using switch-case
switch ($weather) {
    case 'sunny':
        $color = 'blue';
        break;
    case 'cloudy':
        $color = 'grey';
        break;
    default:
        $color = 'error: invalid weather';
        break;
}
echo $color . PHP_EOL;

// using switch-case with expression
switch (true) {
    case $weather == 'sunny':
        $color = 'blue';
        break;
    case $weather == 'cloudy':
        $color = 'grey';
        break;
    default:
        $color = 'error: invalid weather';
        break;
}
echo $color . PHP_EOL;

// using match
match ($weather) {
    'sunny' => $color = 'blue',        
    'cloudy' => $color = 'grey',        
    default => $color = 'error: invalid weather',        
};
echo $color . PHP_EOL;

// using match to return a value
$color = match ($weather) {
    'sunny' => 'blue',        
    'cloudy' => 'grey',        
    default => 'error: invalid weather',        
};
echo $color . PHP_EOL;

// using an associative array
$colors = [
    'sunny' => 'blue',
    'cloudy' => 'grey',
];
echo ($colors[$weather] ?? 'error: invalid weather') . PHP_EOL;