Question

我不确定为什么这段代码会抛出已发送的标头。我看过： How to fix "Headers already sent" error in PHP

我仍然得到错误。它是用ANSI编码的，我用notepad ++键入它，似乎没有空格......任何帮助都会受到赞赏。错误来自第8行。

代码如下：

<!DOCTYPE html>
<html>
<head>
<title>Form Testing</title>
<meta charset="utf-8"/>
</head>
<body>
<?php 
  if($_POST['formSubmit'] == "Submit")  {
     $errorMessage = "";
     $varName = htmlspecialchars($_POST['formName'], ENT_QUOTES, 'UTF-8');
     $varMovie = htmlspecialchars($_POST['formMovie'], ENT_QUOTES, 'UTF-8');
     if(empty($varName)){
      $errorMessage .= "<li>You forgot to enter a name!</li>";
     }
     if(empty($varMovie)){
     $errorMessage .= "<li> You forgot to enter a movie!</li>";
     }
     if(!empty($errorMessage)){
        echo("<p> There was an error with your form: </p> \n");
        echo("<ul>".$errorMessage. "</ul> \n");
     }else{
        $fs = fopen("mydata.csv","a");
         fwrite($fs,$varName . ", " . $varMovie . "\n");
         fclose($fs);
         header("Location: ThankYou.html");
         echo "Hello ".$varName.". Your favorite movie is: ".$varMovie."!";
         exit;
    }
  }else{
    echo "Welcome! Please enter your name and movie preference";
  }
?>
<form action="index.php" method="post">
    Which is your favorite movie?
     <input type="text" name="formMovie" maxlength="50" value="<?=$varMovie;?>">
    What is your name?
    <input type="text" name="formName" maxlength="50" value="<?php echo $varName;?>">
    <input type="submit" name="formSubmit" value="Submit">
</form>

</body>
</html>

Answer 1

您认为以下是什么？

<!DOCTYPE html>              <---output
<html>                       <---output
<head>                       <---output
<title>Form Testing</title>  <---output
<meta charset="utf-8"/>      <---output
</head>                      <---output
<body>                       <---output
<?php 
...
header(...); // oops... output already performed...

Answer 2

所有HTML，甚至标题都会引发你的错误。取出标签和所有HTML，然后重试。

Answer 3

在标题之前没有输出发送意味着它真的！

    <!DOCTYPE html>
    <html>
    <head>
    <title>Form Testing</title>
    <meta charset="utf-8"/>
    </head>
    <body>

是在标题之前发送的输出。

PHP错误标题已发送，没有空格或以前的回显，打印

3 个答案: