Know which plugin is calling JS in wp_head()?

Plugins and themes tend to use wp_enqueue_script() to queue up scripts for the <head /> of your theme.

I would rarely advise this, but since you only need to do it temporarily, you could modify WordPress core and run a debug backtrace for every call to this function.

In wp-includes/functions.wp-scripts.php, drop the following code inside the end of the wp_enqueue_script() function (starts at line 96).

global $_script_callers_backtrace;
if ( !$_script_callers_backtrace )
    $_script_callers_backtrace = array();

$backtrace = debug_backtrace();
$_script_callers_backtrace[] = array( $handle, $backtrace[0]['file'] );

Now pop the following in your theme’s functions.php;

function __save_script_callers()
{
    file_put_contents( WP_CONTENT_DIR . '/callers.' . date('d-m-Y-H-i-s')  . '.log', print_r( $GLOBALS['_script_callers_backtrace'], true ) ); 
}
add_action( 'shutdown', '__save_script_callers' );

Now whenever you load a page on your website, a log gets generated in your WordPress wp-content folder that’ll contain a list of the script handlers and the files that triggered them.

Remember! Undo the changes once you’ve found out what you need!

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