How to validate form in php

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無奈伤痛

I\'m hoping there is a solution for this, I\'m a noob in php, I couldn\'t figure it out.

I got some help from here, to validate the html form in php. It is working ok..b

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耶瑟儿～

2021-01-28 10:12
As you are a newcomer to PHP I would give you some tips for a beginner as I can.

First is that you are outputting an HTML code and processing PHP afterwards. This might not be a good practice (and solution to your problem is quite connected to this). What you are doing is showing a form all the time, without restrictions and checking/validating via PHP afterwards. A good practice is to never output html code before any kind of php goes (there are other issues like of header() function besides your example).

What you would rather do is:
```
<?php
  if (isset($_POST['submit'])) {
  // validations here
  // if (......) { echo 'problem 1...'; }
  // elseif (.....) { echo 'problem 2...'; }
  // else (.....} {
     // No problems so we can send it
     // mail(.....);
  //   }
  }

// done with PHP now show HTML
?>
<form>....</form>
```
Another thing I would give you as a tip is that when building static pages like that (I mean less structured, less object oriented, you know..) a good practice is to store what your are 'echoing / printing' in variables and output them nicely where applicable.

So instead of
```
<?php
  if (empty($user)) { echo 'Username is empty!'; } // Directly echoing (perhaps in not a right place, maybe even before <!DOCTYPE><html> declaration!!
?>
```
You would go with
```
<?php
   $errors = '';
   if (empty($user)) { $errors .= '<br/>Error1: Provide an username'; }
   elseif (empty($name)) { $errors .= '<br/>Error2: Provide a name'; }
   else { /*.....*/ } 
   // Since we have our errors variable with errors (or empty one) we can check for it perhaps in HTML context
?>
<form>
  <?php if (!empty($errors)) { ?>
    <div style='color:red;'>There are some errors! :(</div>
    <?php echo $errors; ?>
    </div>
  <?php } ?>
</form>
```
I hope these humble opinions will help you at least maybe to solve your problem. Good luck
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