How can PHP be used to check if a form field is empty and write a default value to a text file if it is?

To check if a form field is empty in PHP and write a default value to a text file if it is, you can use an if statement to check if the field is empty. If it is empty, you can set a default value and write it to a text file using file_put_contents() function. 

<?php
if(empty($_POST['field_name'])) {
    $default_value = "Default Value";
    file_put_contents('output.txt', $default_value);
} else {
    $field_value = $_POST['field_name'];
    file_put_contents('output.txt', $field_value);
}
?>

Keywords

PHP form field empty check default value text file

Related Questions