划分PHP错误和应用程序错误 [英] Divide PHP errors and Application Errors

问题描述

我在处理应用程序并发生问题。我正在考虑让PHP错误（他们将登录数据库或文件）并管理其他错误（例如您的用户名无效或您输入的密码错误或图像无法加载）与着名的try-catch方法。只有使用try-catch才能完全管理这种错误吗？

I'm working on an Application and a question occurred. I was thinking of letting PHP errors a side (they would be log in the database or in a file) and manage other errors (such as "Your username is not valid" or "Your typed the wrong password" or "The image could not be loaded") with the so famous try-catch method. Is it good to completely manage this kind of errors only with try-catch?

推荐答案

异常的主要优点是它的行为smallite mort，一个本地的 die（）里面的 try {} 块，阻止进一步的代码执行。

The main advantage of exceptions is it's behavior of "petite mort", a local die() inside try{} block, preventing further code from execution.

虽然处理应用程序错误非常方便，但在处理验证用户输入时变得不那么好。如果一个用户填写了3个错误填写表单，那么就可以一次性地将它们全部显示出来，而不是一个接一个地显示出来。

While it's quite handy in handling application errors, it become not so good when dealing with validating user input. If a user made 3 mistakes filling a form, it would be merciful to show them all at once, not one after another.

您更需要POST / Redirect / GET模式来处理用户错误：

You rather need POST/Redirect/GET pattern to handle user errors:

<?  
if ($_SERVER['REQUEST_METHOD']=='POST') {  

  $err = array();
  //performing all validations and raising corresponding errors
  if (empty($_POST['name']) $err[] = "Username field is required";  
  if (empty($_POST['text']) $err[] = "Comments field is required";  

  if (!$err) {  
    //if no errors - saving data and redirect
    header("Location: ".$_SERVER['PHP_SELF']);
    exit;
  }  else {
    // all field values should be escaped according to HTML standard
    foreach ($_POST as $key => $val) {
      $form[$key] = htmlspecialchars($val);
    }
} else {
  $form['name'] = $form['comments'] = '';  
}
include 'form.tpl.php';
?>  

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