PHP mail sends empty email

Question

I'm similar to php and don't understand where the problem lies. Sometimes the php function sends me empty messages like Parent Name Too Late: Lynn: Phone Number: Email: Date of Birth: Message Text: But it should populate values ​​like this Parent Name Too many test errors: Test Lynn: Test phone number: Test email: test@test Date of birth: 21313 Message text: Test This is my php code <!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional/

P粉769045426 · Answer

If your script is just a form handler, you can e.g. add if(empty($_POST)) { die('No form data!'); } to the top to prevent it from running, Unless the response form is submitted.

If you need to fill in all fields, you must check each field before processing the email. You could cram all of these isset into one giant if(isset(...) statement. However, there is a simpler, more readable way to do it .First, let’s set up a few variables:

// Your required fields:
$fields = ['parent', 'child', 'contacts', 'email', 'bbd', 'city', 'mess'];
// Your data is collected here:
$data = [];
// Any errors are collected here:
$errors = [];

We then loop over the fields and if the value exists, add it to $data, otherwise we add an error comment.

// Loop to check your required fields:

foreach($fields as $field) {
    // If value exists, add to $data:
    if(!empty($_POST[$field])) {
        $data[$field] = $_POST[$field];
    }
    // Else add error:
    else {
        $errors[] = 'Missing field: ' . $field;
    }
}

if(empty($errors)) {
    // No errors, send your email
    // You can use "Vanema nimi {$data['parent']}...",
    // ... otherwise: extract($data) to use $parent etc.
}
else {
    // You could report those errors, or redirect back to the form, or whatever.
}

If an error occurs (= missing field), the email will not be sent. As a bonus, you now have a reusable piece of code that can be used in other forms with similar functionality by simply modifying the $fields array. (If you really need to reuse it, it's a good idea to wrap it into a function; don't copy-paste the code. function x($post, $fields) { ... } Used for basic manipulation helpers function.)

Please note that here we use empty instead of isset. If a blank form is submitted, field will be set (to the empty string ""). Also note that empty returns true for anything equal to false (i.e. "", 0, false, null, []). ( If "0" is an expected and acceptable value, please note its "emptiness"! ) On the other hand, isset for anything that is not # The content of ##null returns true.

Side note If the above code is complete and your script just handles form data and redirects, then you don't need the HTML wrapper at all. It never displays.