通知用户他们错过了表单中的特定输入字段

Question

I am trying to create a form where if a user doesn't enter information into a specific input then on submission of the form, the user is alerted to fill in that input field only (e.g. "Please enter a username").

Currently I have a foreach loop that loops through each input field of the form and assigns a variable with the same name as the field (i.e. $name = $_POST['name']).

What would I implement in my code so I could check each individual input field is empty or not and tell the user this, but keep the code to a bare minimal?

foreach ($_POST as $key => $value) {

     $$key = $_POST[$key];  //assigns variable to input.

    }

if(!empty($$key)) {

//code if all fields are not empty  

}
else {

    echo "Please fill in all fields";

}

Answer 1

While I do not agree with how you are doing this, a solution would be to add an error array to your first foreach loop.

foreach ($_POST as $key => $value) {
     ${$key} = $_POST[$key];

     // If the field is empty, set an error
     if( empty($value) ) {
         $errors[] = 'Please enter a ' . $key . '.';
     }
}

And then change the bottom to check for the error array. If it's empty, run your code to complete the form submission. If not, loop through the errors.

if( empty($errors) ) {
    //code if all fields are not empty
}
else {
    // Loop through each error found
    foreach($errors as $error) {
        echo $error;
    }
}