Highlighting js-code inside php file

If you use the hard-coded "JS" heredoc, it'll know it's Javascript and give you autocomplete for that snippet:

$javascript_code = <<<JS
  function test(){
  console.log('hello!');    
}
JS;

Settings | Template Data Languages -- find your file(s) or folder(s) and assign JavaScript to them (instead of default HTML).

If you keep your stuff well organized, then you will benefit from keeping all *.js.php files under separate subfolder -- this allows single assignment for a whole folder (and all files inside) instead of multiple assignments for individual files.

• Put your cursor on the JavaScript part
• Press Alt + Enter
• Select Inject Language
• Select JavaScript

For example:

<?php
echo "<script>/* CURSOR HERE*/
    alert('Hello World');
    </script>";