因此，基本上，我有一个简单的表单，每次使用PHP按下Submit时，我都希望更改输入框的文本。我知道我的代码行不通，但是我不明白如何解决此问题。也许数组不是执行此操作的最佳方法？
<body>
<?php
if(isset($_GET['submit'])) exit();
$msg= ['One', 'Two', 'Three', '']
?>
<form action="<?php echo $_SERVER['PHP_SELF']?>">
<input type="submit" name="submit" value="Paina nappi">
<input type="text" name="msg" value="<?php echo (isset($msg)) ? $viesti : ''; ?>">
</form>
</body>
您可以这样写：
<?php
session_start();
$msgArray= array('One', 'Two', 'Three', '');
// if $_SESSION['msgIndex'] is not set, we initialize it, or it will take 0 value every loading page
if (!isset($_SESSION['msgIndex'])) { $_SESSION['msgIndex'] = 0; }
if (isset($_GET['submit'])) {
getMessage();
}
// We save msgIndex in a $_SESSION variable cause even if the user reload the page, we keep the value
function getMessage() {
if ($_SESSION['msgIndex'] >= 0) {
$_SESSION['msgIndex'] += 1;
} if ($_SESSION['msgIndex'] > 3) {
$_SESSION['msgIndex'] = 0;
}
}
?>
<form action="<?php echo $_SERVER['PHP_SELF']?>">
<input type="submit" name="submit" value="Paina nappi">
<input type="text" name="msg" value="<?= $msgArray[$_SESSION['msgIndex']] ?>">
</form>