In what situations should one use echo to output variables for troubleshooting PHP scripts that generate JavaScript functions?

When troubleshooting PHP scripts that generate JavaScript functions, using echo to output variables can be helpful in identifying any issues with the data being passed from PHP to JavaScript. This can be particularly useful when trying to debug problems with variable values or syntax errors in the generated JavaScript code. By echoing out the variables before they are used in the JavaScript functions, you can ensure that the correct data is being passed and processed correctly.

<?php
$variable1 = "Hello";
$variable2 = "World";

echo "<script>";
echo "var jsVariable1 = '" . $variable1 . "';";
echo "var jsVariable2 = '" . $variable2 . "';";
echo "</script>";
?>