What are common pitfalls when mixing PHP with HTML buttons?

One common pitfall when mixing PHP with HTML buttons is not properly handling form submissions. To solve this, make sure to check if the form has been submitted before processing the data. This can be done by checking if the submit button has been clicked using isset() function in PHP. 

<?php
if(isset($_POST['submit'])){
    // Process the form data here
}
?>

<form method="post">
    <input type="text" name="username">
    <input type="submit" name="submit" value="Submit">
</form>

Keywords

PHP HTML buttons form submission syntax error

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