What potential error in the PHP code could be causing nothing to be outputted?

The potential error in the PHP code could be that there is an issue with the logic or syntax that is preventing any output from being generated. One common mistake could be forgetting to include the `echo` or `print` statement to display the output. To solve this issue, ensure that the code is correctly structured to output the desired content.

<?php
// Incorrect code that does not output anything
$variable = "Hello World";
// Missing echo statement to display the output
?>

<?php
// Corrected code that outputs the variable value
$variable = "Hello World";
echo $variable;
?>