How can input fields in a PHP form be preloaded with values after submission?

When a PHP form is submitted, the input fields can be preloaded with the submitted values by accessing the form data through the $_POST superglobal array. You can use the ternary operator to check if the form data exists and then echo it as the value attribute in the input fields. 

<input type="text" name="username" value="<?php echo isset($_POST['username']) ? $_POST['username'] : ''; ?>">
<input type="email" name="email" value="<?php echo isset($_POST['email']) ? $_POST['email'] : ''; ?>">
<input type="password" name="password" value="">

Keywords

PHP form submission input fields preloaded values data persistence

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