如何确保所有字段都填写了php？

Question

你好。 我试图写一些php将输入导出为csv格式。 它确实工作得很好，除了它不检查以确保所有字段都已填充。 我如何确保它们都已满。

<?php
$txt = "report.csv";
$fh = fopen($txt, 'a+');
if (isset($_POST['firstname']) && isset($_POST['lastname']) && isset($_POST['version']) && isset($_POST['description'])) { // check if both fields are set
   $first = $_POST['firstname'];
   $last =  $_POST['lastname'];
   $version = $_POST['version'];
   $description = $_POST['description'];
   $q = "\"";
   $c = ",";
   $check=$first.$last.$version.$descrption;
   $txt=$q.$first.$q.$c.$q.$last.$q.$c.$q.$version.$q.$c.$q.$description.$q;
   if (strpos($check, '"') !== false){
   echo file_get_contents("/quotes.html");
   } else {
   file_put_contents('report.csv',$txt."\n",FILE_APPEND); // log to data.txt
   echo file_get_contents("yay.html");
   exit();
   }
} else {
echo file_get_contents("notfilled.html");
}

?>

HTML

  <form action="problem.php" method="POST">
    <label for="fname"><h3>First Name</h3></label>
    <input type="text" id="fname" name="firstname">

    <label for="lname"><h3>Last Name</h3></label>
    <input type="text" id="lname" name="lastname">
    <label for="version"><h3>Version</h3></label>
    <select id="version" name="version">
      <option value="0.1">0.1</option>
      <option value="0.2">0.2</option>
      <option value="Other">Other</option>
    </select>
    <label for="description"><h3>Description</h3></br><p1>Please describe your problem with details. Explain what the problem is how to reproduce it.</label>
    <textarea id="description" name="description" style="height:100px"></textarea>

    <input type="submit" value="Submit">
  </form>

Answer 1

您需要添加!empty以检查值是否为空。 如果您也想检查其他情况，例如名称不应该是数字，那么您也应该使用regex 。

if (!empty($_POST['firstname']) && !empty($_POST['lastname']) && !empty($_POST['version']) && !empty($_POST['description'])) {

对您发表评论Whats the difference from !empty and isset ？

假设你有一个变量

$test= "";

if(empty($test)) // it return true because "" is empty

if(isset($test)) // return true because $test is defined 

而

if(empty($anotherTest)) // return true because its null

if(isset($anotherTest)) // return false because is not defined