Hook inside WordPress using JavaScript content

[toplisek]

I try to use a hook inside WordPress using JavaScript content.
How to show JavaScript content inside PHP file (.PHP) as an example:

<script type="text/javascript">window.Parsley.setLocale('en'); </script>
<script src="" async defer></script>//Google API connection

An example:

function mytheme_enqueue_script() {
  wp_enqueue_script( 'my-custom-js', 'custom.php', false );
}