在提交之前清除通过 $_POST 传递的值的函数

Question

我正在编写一个函数，它从 中获取内容$_POST，将其插入到一个字符串中，然后返回结果字符串

对于“你最喜欢的颜色是什么？”这个问题。用户输入blue 问题“你最喜欢的动物是什么？” 用户输入dog

$content = "The visitor's favorite color is {color}";
$content = sentenceBuilder($content);

$content = "The visitor's favorite animal is a {animal}";
$content = sentenceBuilder($content);

function sentenceBuilder($content){
   global $_POST;
    foreach($_POST as $key => $value){
     if($key=='color'){
      $content = preg_replace("/\{($key+)\}/", $value, $content);
     }
     if($key=='animal'){
      $content = preg_replace("/\{($key+)\}/", $value, $content);
     }
    }
   return $content;
}

这将返回“访客最喜欢的颜色是蓝色”和“访客最喜欢的动物是狗”。如果他们将颜色元素留空，则返回“访客最喜欢的颜色是”和“访客最喜欢的动物是狗”。如果他们将两个元素都留空，则返回 2 个不完整的句子。

所以，我试图修改它说如果$value是空的，该函数将跳过它并移动到下一个（因为它使用在 $_POST 中移动的每个表单元素）......

if($key=='color' && $value!=''){
  $content = preg_replace("/\{($key+)\}/", $value, $content);
}else{
  $content ='';
}
if($key=='animal' && $value!=''){
  $content = preg_replace("/\{($key+)\}/", $value, $content);
}else{
  $content ='';
}

加上这个，我得到的结果是空白的。没有句子什么的。即使他们填写了元素，添加了此代码的结果仍然是空白的。

所以我尝试了这个。

function sentenceBuilder($content){
   global $_POST;
    foreach($_POST as $key => $value){
     if(isset($value) && $value!=''){
       if($key=='color'){
        $content = preg_replace("/\{($key+)\}/", $value, $content);
       }
       if($key=='animal'){
        $content = preg_replace("/\{($key+)\}/", $value, $content);
       }
     else{
      $content = '';
     }
    }
   return $content;
}

这产生了相同的结果。

TLDR；

我希望能够让这个函数用一个句子替换不为空的值的内容。那些是空的，我希望不显示内容。

更新

我得到了工作的代码。不得不重新设计它以实现它。

<?php 

if(isset($_POST)){
$content = "The visitor's favorite color is {color}";
echo sentenceBuilder($content);
?> <br/> <?php
$content = "The visitor's favorite animal is a {animal} from {land}";
echo sentenceBuilder($content);
?> <br/> <?php
$content = "The visitor is from {land}";
echo sentenceBuilder($content);
?> <br/> <?php
$content = "The visitor is from Iowa";
echo sentenceBuilder($content);
?> <br/> <?php
$content = "The visitor is from {state}";
echo sentenceBuilder($content);
}

function sentenceBuilder($content){
     preg_match("/\{(.*?)\}/", $content, $checkbrackets);
     if(!empty($checkbrackets)){
         $gettext = str_replace('{', '', $checkbrackets[0]);
         $gettext = str_replace('}', '', $gettext);

         if(array_key_exists($gettext,$_POST)){
             if(!empty($_POST[$gettext])){
                $content = preg_replace("/\{($gettext+)\}/", $_POST[$gettext], $content);
             }else{
                $content = ''; 
             }
         }
     }
   return $content;
}   

?>


<form method="post" action"sentencebuilder.php">
<input type="text" name="color" />
<input type="text" name="animal" />
<input type="text" name="land" />
<input type="submit" />
</form>

感谢您的帮助伙计们。输入它，你会看到我要做什么。我目前正在努力更改问题中存在的其他括号。

Answer 1

使用此代码，绝对是您问题的解决方案：-

<?php
    $main_content = array();
    if(isset($_POST['submit'])) {
     unset($_POST['submit']);
      $main_content['color'] = "The visitor's favorite color is {color}";
      $main_content['dog'] = "The visitor's favorite dog is {dog}";
      $main_content['school'] = "The visitor's favorite school is {school}"; 
      $formData = array_filter($_POST);
      if(!empty($formData)) {
        echo sentenceBuilder($formData, $main_content);
      }
    } 

    function sentenceBuilder($formData=null, $main_content=null){
            $newContent = "";
        foreach ($formData as $key => $value) {
            $newVal = "";   
            $newVal = preg_replace("/\{($key+)\}/", $value, $main_content[$key]);
            $newContent .= $newVal.". <br/>";   
        }

        return $newContent;
      }
    ?>


    <form method="post" action="#">
    <input type="text" name="color" placeholder="color" />
    <input type="text" name="dog" placeholder="dog" />
    <input type="text" name="school" placeholder="school" />
    <input type="submit" name="submit" />

**OUTPUT:**

    The visitor's favorite color is RED. 
    The visitor's favorite dog is BULLDOG. 
    The visitor's favorite school is CAMPUS SCHOOL.