What are common reasons for $_POST variables not being passed in PHP forms?

Common reasons for $_POST variables not being passed in PHP forms include incorrect form method (should be "post"), missing name attribute in form fields, and form submission to the wrong file or URL. To solve this issue, make sure the form method is set to "post", all form fields have a name attribute, and the form action points to the correct file or URL. 

<form method="post" action="process_form.php">
    <input type="text" name="username">
    <input type="password" name="password">
    <button type="submit">Submit</button>
</form>

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$_POST variables PHP forms passing reasons

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