Input Id Name showing to URL?

I have a problem, I am trying to make some forms in bootstrap however it messed up.

Once I converted the forms to bootstrap related they are no longer doing the job they’re supposed to do. What I am trying to do is to save form logs to a txt file, but they won’t save.

When I add name="test" it won’t work, instead it writes in the url.

URL: localhost/save.php?John

save.php

<?php
    $myfile = fopen("test.txt", "a+");
    $txt = "Name : ".$_POST['test451']." -> Surname: ".$_POST['loki'];
    fwrite($myfile, $txt);
    fclose($myfile);
?>

index

<form action="/save.php" class="needs-validation" novalidate>
    <div class="row">
        <div class="col-md-6 mb-3">
            <label for="firstName">First name</label>
            <input type="text" class="form-control" id="firstName" name="loki" placeholder="" value="" required>
            <div class="invalid-feedback">
                Valid first name is required.
            </div>
        </div>
        <div class="col-md-6 mb-3">
            <label for="lastName">Last name</label>
            <input type="text" class="form-control" id="lastName" name="test451" placeholder="" value="" required>
            <div class="invalid-feedback">
                Valid last name is required.
            </div>
        </div>
    </div>
</form>

Answer

Seeing the comment you left with this code: (edit: you added that in the question just now in an edit)

<form action="/save.php" class="needs-validation" novalidate>

Forms default to a GET method if there is no POST implied. So you’re getting the ?John back because of it.

Add method="post" in your form.

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Answer