Loops

redd

while loop

1. <?php
   
2. $x = 1;
   
3. 
   
4. while($x <= 5) {
   
5.   echo "The number is: $x <br>";
   
6.   $x++;
   
7. }
   
8. ?>

複製代碼

會先檢查看看 $x 有沒有小於等於 5.

redd

do...while loop

1. <?php
   
2. $x = 6;
   
3. 
   
4. do {
   
5.   echo "The number is: $x <br>";
   
6.   $x++;
   
7. } while ($x <= 5);
   
8. ?>

複製代碼

會先執行一次，然後才去檢查 $x 有沒有小於等於 5.

redd

for loop

1. <?php
   
2. for ($x = 0; $x <= 10; $x++) {
   
3.   echo "The number is: $x <br>";
   
4. }
   
5. ?>

複製代碼

redd

foreach loop

1. <?php
   
2. $colors = array("red", "green", "blue", "yellow");
   
3. 
   
4. foreach ($colors as $value) {
   
5.   echo "$value <br>";
   
6. }
   
7. ?>

複製代碼

redd

key 和 value

1. <?php
   
2. $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
   
3. 
   
4. foreach($age as $x => $val) {
   
5.   echo "$x = $val<br>";
   
6. }
   
7. ?>

複製代碼

redd

break

1. <?php
   
2. for ($x = 0; $x < 10; $x++) {
   
3.   if ($x == 4) {
   
4.     break;
   
5.   }
   
6.   echo "The number is: $x <br>";
   
7. }
   
8. ?>

複製代碼

0 1 2 3

redd

continue

1. <?php
   
2. for ($x = 0; $x < 10; $x++) {
   
3.   if ($x == 4) {
   
4.     continue;
   
5.   }
   
6.   echo "The number is: $x <br>";
   
7. }
   
8. ?>

複製代碼

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