PHP if...else 語句

PHP - if...else 語句

當條件為真時，if...else 語句會執行一些程式碼，否則會執行另一段程式碼。

語法

if (condition) {
  // code to be executed if condition is true;
} else {
  // code to be executed if condition is false;
}

$t = date("H");

if ($t < "20") {
  echo "Have a good day!";
} else {
  echo "Have a good night!";
}

PHP - if...elseif...else 語句

對於兩個以上的條件，if...elseif...else 語句會執行不同的程式碼。

語法

if (condition) {
  code to be executed if this condition is true;
} elseif (condition) {
  // code to be executed if first condition is false and this condition is true;
} else {
  // code to be executed if all conditions are false;
}

$t = date("H");

if ($t < "10") {
  echo "Have a good morning!";
} elseif ($t < "20") {
  echo "Have a good day!";
} else {
  echo "Have a good night!";
}