Conditional Statements

redd

1. <?php
   
2. $t = date("H");
   
3. 
   
4. if ($t < "10") {
   
5.   echo "Have a good morning!";
   
6. } elseif ($t < "20") {
   
7.   echo "Have a good day!";
   
8. } else {
   
9.   echo "Have a good night!";
   
10. }
    
11. ?>

複製代碼

if...elseif...else

redd

1. <?php
   
2. $favcolor = "red";
   
3. 
   
4. switch ($favcolor) {
   
5.   case "red":
   
6.     echo "Your favorite color is red!";
   
7.     break;
   
8.   case "blue":
   
9.     echo "Your favorite color is blue!";
   
10.     break;
    
11.   case "green":
    
12.     echo "Your favorite color is green!";
    
13.     break;
    
14.   default:
    
15.     echo "Your favorite color is neither red, blue, nor green!";
    
16. }
    
17. ?>

複製代碼

注意 break 和 default。