Invoking PHP code from within Javascript will output the function as a direct string

I seem to be going in circles and missing something silly...

My setup involves using CodeIgniter on the server-side and Bootstrap on the client, but that's not really the issue here...

I am attempting to access a PHP value within a JavaScript function. The value is stored in a protected variable within one of the PHP controllers, which can be accessed by the views loaded in that controller. I believed I could access the variable directly in the HTML and therefore in the JavaScript as well.

The code is simple:

$(document).ready(function() {
    var UID = "<?php echo $the_user->id; ?>";
    console.log(UID);
});

I expect this to output "1" in the console, but it actually outputs the actual string "<?php echo $the_user->id; ?>". The same happens when echoing a simple string instead of a PHP variable.

This seems like it could be a configuration problem, but I'm unsure. When I remove the quotes from the PHP call, I get a

TypeError: can't wrap XML objects   
console.log(<?php echo $the_user->id ?>);

Any thoughts? I feel quite foolish at this point :(

phpjavascript

Answer №1

If the output displays 

<?php echo $the_user->id; ?>
, this indicates that PHP is not being parsed in your document.

Double-check the file extension and verify that it is correctly being processed by PHP in your webserver configuration.

For instance, if you include PHP tags in a .js file, they will not be interpreted as PHP code. If you are using Apache, you may need to add:

AddType application/x-httpd-php .js

Alternatively, set your variables within the HTML and pass them as parameters to the external JavaScript file.

Answer №2

It's important to ensure that your file is being processed as a view, as mathieu-imbert pointed out. This is the first step in tackling the issue.

Furthermore, when attempting to incorporate PHP variables into JavaScript, you must consider how to handle escaping variables and unexpected values. Luckily, there is a simple solution:

$(document).ready(function() {
    var UID = <?php echo json_encode($the_user->id); ?>;
    console.log(UID);
});

By following this method, you can easily integrate complex data into your JavaScript code while keeping in mind the usual limitations of serializing PHP data.

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