To insert two values into one column in php follow this example code
<?php $_POST['input field name'].' '.$_POST['input field name']; ?>
First is your input first name and second is your input last name, for insert follow this code:
<?php $username=$_POST['input field name'].' '.$_POST['input field name']; mysqli_query("INSERT into table name(`username`)VALUES('".$username."')"); ?>
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