PHP variable inside a js file [duplicate]

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难免孤独

2021-01-16 05:19
Don't forget to properly escape your variables before passing them to JavaScript. Use json_encode() for this, as it escapes and encodes your values in a way suitable for using with JavaScript:
```
test=<?php echo json_encode($country) ?>;
```
Never simply send the variable un-encoded, as it might break things, or, worse, if the value comes from untrusted sources, compromise your security.

Also, rename your file to .php instead of .js if you want to be able to insert dynamic PHP code inside it.
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深忆病人

2021-01-16 05:20
put your JS code inside a .php file and try like this:
```
<html>

<script language="JavaScript"> 
function echoSession(num) 
{ 
 window.document.newForm.mybox.value=num; 
 <?PHP echo $VAR ?> 
}
 </script>
</html>
```
The point is your file should be a PHP file to make server to parse it as php. if it is a .js file it will not work
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隐瞒了意图╮

2021-01-16 05:29

In order for you to be able to use markup within a Javascript file, you must either:

1) Modify your .htaccess file to include *.js as a valid extension for files to be processed through the PHP Engine. (Google around for this)

2) Change the Javascript file extension from *.js to *.php.

3) Declare variables which are set through PHP within the main PHP/HTML file, rather than the external Javascript file.

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春和景丽

2021-01-16 05:33
This is a problem I face often when dealing with js vs php. As my JS applications become more complex there is more and more a desire to keep all my JS in library files and keep my php as clean as possible. One solution I have started using is to do the following:

js file:
```
myNamespace.bootstrap = function( payload ){
  ... 
  // internally boot up all the modules that need 
  // the data, passing it where relavent
  module.load( payload );
}
```
php file:
```
  ...
  <script type="text/javascript">
    myNamespace.bootstrap(<?= json_encode($payload_object); ?>);
  </script>
</body>
```
This gives you one data injection point for all your scripts with one line of js in your actual php. Should allow you to easy manage data dependencies in your javascript since you can namespace them in php.
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滥情空心

2021-01-16 05:35
There is the json_encode (http://php.net/manual/de/function.json-encode.php) method to print php variables for javascript.
```
test = <?php echo json_encode($value) ?>
```
Works even if $value is an array, but in your case if it's a string, too.
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难免孤独

2021-01-16 05:43
Remember that the browser doesn't care what the serverside (PHP) code was. It only cares what the rendered code (Javascript and HTML) looks like. So your PHP
```
test=<?php echo $country; ?>;
```
will come out something like this, presuming $country is a string:
```
test=USA
```
That is valid Javascript, but it doesn't set test to have the value USA. It sets test to the value of the variable USA, which is almost certainly undefined. You need to use quotation marks to make a Javascript string literal:
```
test="<?php echo $country; ?>";
```
This will be rendered as so:
```
test="USA";
```
and will do what you expect.

I see now that you've mentioned that the file is a js file. I presumed above that it was a standard PHP-with-HTML file. As it is, everything above is still valid. However, serving a PHP script as Javascript is only slightly tricky.

First, name your file filename.php (or whatever other name you want). This is by far the easiest way to get the webserver to know to parse it with PHP. Then use the following instruction to let the browser know that the file is Javascript content:
```
header('Content-Type', 'text/javascript');
```
Put that at the very top of your file, before any content is sent to the browser. You can then include PHP variables as you like.
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