获取要在HTML Div中显示的PHP变量

尝试获取$missing的错误消息以显示在id为error的表单div中，如果表单填写正确，则在id为success的表单div中显示$complete消息

<?php 
$error = false;
$missing = "";
if ($_POST) {      
  $complete = "<p><strong>Thank you!</strong> Your message was sent, 
  we'll get back to you ASAP!</p>";    

   if (filter_var($_POST["email"], FILTER_VALIDATE_EMAIL) === false {        
        $missing .= "A vaild email address is required.<br>";
        $error = true;
    } 
    if (!$_POST['subject']) {
        $missing .= "A subject field is required.<br>";
        $error = true;
    }
    if (!$_POST['content']) {
        $missing .= "A content field is required.<br>";
        $error = true;
    }
    if ($error) {
        $missing = "<p>". $missing."</p>";
    } else {
        $complete;
    }
} 
?>

我认为不应该这样（因为当你提交表单时，它总是发布，所以你必须检查它是否为空）

应该是

if($_POST['subject']=='')   
if($_POST['content']=='')'
( - it means if data is blank)

和在HTML页面中
你应该使用

<?php echo $missing; ?> or <?=$missing;?>
<?php echo $complete; ?> or <?=$complete;?>

或
或
我认为不应该这样（因为当你提交表单时，它总是发布，所以你必须检查表单是否为空）

应该是

if($_POST['subject']=='')   
if($_POST['content']=='')'
( - it means if data is blank)

和在HTML页面中
你应该使用

<?php echo $missing; ?> or <?=$missing;?>
<?php echo $complete; ?> or <?=$complete;?>

或
或
参见代码中的注释

<?php 

$error = false;
$missing = "";

if ($_POST) {

  $complete = "<p><strong>Thank you!</strong> Your message was sent, we'll get back to you ASAP!</p>";

  if (filter_var($_POST["email"], FILTER_VALIDATE_EMAIL) === false ) {   // There was a missing parenthesis here.
    $missing .= "A vaild email address is required.<br>";
    $error = true;
  } 

  if ($_POST['subject']=="") {                       // Check if empty, not if exist... It may exist as empty.
    $missing .= "A subject field is required.<br>";
    $error = true;
  }

  if ($_POST['content']=="") {
    $missing .= "A content field is required.<br>";
    $error = true;
  }

  if ($error) {
    $missing = "<p>". $missing."</p>";
    $complete = "";                                   // Remove the success string here.
  }
} 

?>

参见代码中的注释

<?php 

$error = false;
$missing = "";

if ($_POST) {

  $complete = "<p><strong>Thank you!</strong> Your message was sent, we'll get back to you ASAP!</p>";

  if (filter_var($_POST["email"], FILTER_VALIDATE_EMAIL) === false ) {   // There was a missing parenthesis here.
    $missing .= "A vaild email address is required.<br>";
    $error = true;
  } 

  if ($_POST['subject']=="") {                       // Check if empty, not if exist... It may exist as empty.
    $missing .= "A subject field is required.<br>";
    $error = true;
  }

  if ($_POST['content']=="") {
    $missing .= "A content field is required.<br>";
    $error = true;
  }

  if ($error) {
    $missing = "<p>". $missing."</p>";
    $complete = "";                                   // Remove the success string here.
  }
} 

?>

在没有看到表单的情况下，很难在那里解决任何问题，但如果您有表单，最好进行一些返工。您不需要
$error
标记，应该将错误存储在数组中。如果数组末尾的计数大于1，则存在明显错误。在确定post值是否为空之前，还应首先删除post值中的空格：

<?php 
# Make a function to remove spaces in the array. If the user types two empty
# spaces, it's considered not empty, so this will remove that and only leave
# actual string content (or empty).
function trimArray($array)
    {
        # Trim the value of empty spaces
        if(!is_array($array))
            # Send back since not an array
            return trim($array);
        # Loop through array and apply this same function
        foreach($array as $key => $value) {
            $array[$key] = trimArray($value);
        }
        # Return this array
        return $array;
    }

# Store your errors in an array
$missing = array();
# Check if the post is empty or not
if(!empty($_POST)){
    # Remove empty spaces from values in the post
    $POST = trimArray($_POST);
    # Check email
    if(!filter_var($POST["email"], FILTER_VALIDATE_EMAIL))
        $missing[] = "A vaild email address is required.";

    # Check if subject set
    if(empty($POST['subject']))
        $missing[] = "A subject field is required.";

    # Check if content
    if(empty($POST['content']))
        $missing[] = "A content field is required.";

    if(empty($missing)) {
        # Send mail here
        # Also check that it was successful...
    }
} 
?>

<!-- You only need one div that has a ternary condition. Set the class and message value -->
<!-- based on whether the $message array is empty or not -->
<form method="post" action="#">
    <h1>Get in touch!</h1>
    <?php
    # You have no neutral condition so if there is no post, then it will 
    # still come back as saying it's successful.
    # But that doesn't make any sense if no post was sent....
    if(isset($_POST['email'])) { ?>
    <div id="error" class="alert alert-<?php echo (!empty($missing))? 'danger' : 'success' ?>" role="alert">
        <p><?php echo (!empty($missing))? implode('<br />',$missing) : "<strong>Thank you!</strong> Your message was sent, we'll get back to you ASAP!" ?></p>
    </div>
    <?php } ?>

在没有看到表单的情况下，很难在那里解决任何问题，但如果您有表单，最好进行一些返工。您不需要
$error
标记，应该将错误存储在数组中。如果数组末尾的计数大于1，则存在明显错误。在确定post值是否为空之前，还应首先删除post值中的空格：

<?php 
# Make a function to remove spaces in the array. If the user types two empty
# spaces, it's considered not empty, so this will remove that and only leave
# actual string content (or empty).
function trimArray($array)
    {
        # Trim the value of empty spaces
        if(!is_array($array))
            # Send back since not an array
            return trim($array);
        # Loop through array and apply this same function
        foreach($array as $key => $value) {
            $array[$key] = trimArray($value);
        }
        # Return this array
        return $array;
    }

# Store your errors in an array
$missing = array();
# Check if the post is empty or not
if(!empty($_POST)){
    # Remove empty spaces from values in the post
    $POST = trimArray($_POST);
    # Check email
    if(!filter_var($POST["email"], FILTER_VALIDATE_EMAIL))
        $missing[] = "A vaild email address is required.";

    # Check if subject set
    if(empty($POST['subject']))
        $missing[] = "A subject field is required.";

    # Check if content
    if(empty($POST['content']))
        $missing[] = "A content field is required.";

    if(empty($missing)) {
        # Send mail here
        # Also check that it was successful...
    }
} 
?>

<!-- You only need one div that has a ternary condition. Set the class and message value -->
<!-- based on whether the $message array is empty or not -->
<form method="post" action="#">
    <h1>Get in touch!</h1>
    <?php
    # You have no neutral condition so if there is no post, then it will 
    # still come back as saying it's successful.
    # But that doesn't make any sense if no post was sent....
    if(isset($_POST['email'])) { ?>
    <div id="error" class="alert alert-<?php echo (!empty($missing))? 'danger' : 'success' ?>" role="alert">
        <p><?php echo (!empty($missing))? implode('<br />',$missing) : "<strong>Thank you!</strong> Your message was sent, we'll get back to you ASAP!" ?></p>
    </div>
    <?php } ?>

是否启用了短标记？jQuery在这里的用法是什么？首先，这只是一个零散的变量
或者{$complete；
-这里缺少代码，比如在（表单）元素输入和结束形式
标记中。所以我们不知道这是否有错。除了Chris的注释之外。直到我们确切知道是哪只动物我们正在处理这里，除了告诉您检查开发人员控制台并使用错误报告之外，任何人都无法为您做任何事情。如果（filter_var（$_POST[“email”]，filter_VALIDATE_email）===false）缺少此括号{$missing.=“需要有效的电子邮件地址。
”；$error=true；}提供完整的代码您是否启用了短标记？这里jQuery的用法是什么？首先，这只是一个杂散变量
else{$Complete；
-这里缺少代码，如（表单）中所示元素输入和结束形式
标记。所以我们不知道这是否是错误。除了Chris的评论之外。直到我们确切知道我们要处理的是哪种动物之前，除了告诉您检查开发人员控制台并使用错误报告外，任何人都无法为您做任何事情。如果（filter_var（$\u POST[“email”]、FILTER\u VALIDATE\u email）==false）缺少此括号{$missing.=“需要有效的电子邮件地址。
”；$error=true；}提供完整的Code@LouysPatriceBessette我不知道这是一个选项，谢谢你告诉我！@Louyspatricebesette编辑后将其包括在内。你每天都会学到新东西：D@LouysPatriceBessette我不知道这是一个选项，谢谢你告诉我！@Louyspatricebesette编辑了这个选项。你学到了一些东西每日新：D