如何取整到下一個偶數？

Question

我想用PHP來整理下一個整數。

實施例：

• 如果71 - >輪高達72
• 如果33.1 - >輪高達34
• 如果20.8 - >輪高達22

Answer 1

$num = ceil($input); // Round up decimals to an integer 
if($num % 2 == 1) $num++; // If odd, add one 

測試案例：

$tests = ['71' => '72', '33.1' => '34', '20.8' => '22']; 
foreach($tests as $test => $expected) { 
    $num = ceil($test); 
    if($num % 2 == 1) $num++; 
    echo "Expected: $expected, Actual: $num\n"; 
} 

Produces：

Expected: 72, Actual: 72 
Expected: 34, Actual: 34 
Expected: 22, Actual: 22