如何讓 php 知道我在輸入中進行了更改？

Question

好吧，我有這個 html：

 <?php if(isset($_POST['do_change'])) { // that is the place where i need to place if(changes have been made in input) echo "yeey y made changes"; }?>

並更改 php：

 <form action="changes.php" method="POST"> <input type="text" name="goose"> <input type="text" name="cat"> <input type="submit" name="do_change"> </form>

我需要<input name="goose" value="hey">和<input name="cat" value="">顯示文本：“你在輸入中寫了一些名字為 goose 而沒有名字為 cat 的東西”

Answer 1

要檢查用戶是否填寫了多個文本輸入字段，例如，您可以執行以下操作：

// array with names of the fields you want to check
$fieldnames = ['goose', 'cat', 'kangaroo'];

// initialize counter of filled fields with 0
$filled = 0;

// loop over the field names
foreach($fieldnames as $fieldname) {
  // check if a value under that name exists in the $_POST array,
  // and if so, that its value is not the empty string
  if(isset($_POST[$fieldname]) && $_POST[$fieldname] !== '') {
    $filled++;
  }
}

if($filled > 1) {
  echo 'You filled more than one field.';
}

Answer 2

你忘了{}

第一頁：

<form action="changes.php" method="POST">
<input type="text" name="goose">
<input type="submit" name="do_change">
</form>

更改。php：

if(isset($_POST['do_change'])){
// that is the place where i need to place if(changes have been made in input)
echo "yeey y made changes";
}