passing information through anon functions

[marcdefiant]

I was curious to exactly how the following code works:

add_action('script_loader_src', scripts($src))

now, of course this will call the function ‘scripts’ and pass the $src variable, but where does the $src value come from?

I haven’t been able to successfully find any information on this and have no idea even what to call it.

any helps is much appreciated

[Senff]

Can you place it in context? I know it’s WordPress and that’s it’s a filter hook, but where does this code appear?

Normally there should be no arguments/variables in the “scripts” function but even if there would be, $src must be defined somewhere. But seeing just this line without any context makes it hard to see where that would be.

[marcdefiant]

This is my actual code:

add_action('script_loader_src', function($src){
  if(strpos($src, '?ver='))$src = remove_query_arg('ver', $src);
  return $src;
}, 10, 2);

I have no idea how this works because (as you stated) the variable isn’t defined anywhere in my code.

[Senff]

Alright, but where did you get the code from? Is it part of a theme? Who wrote it?

[marcdefiant]

I wrote the theme; looking up anything I didn’t already know to make everything work as expected.

Here is the method that runs:

public function _css_href($src, $ver, $handle){
  if(!is_bool($src) && !preg_match('|^(https?:)?//|', $src) && !($this->content_url && 0 === strpos($src, $this->content_url)))$src = $this->base_url.$src;
  if(!empty($ver))$src = add_query_arg('ver', $ver, $src);
  $src = apply_filters('style_loader_src', $src, $handle);
  return esc_url($src);
}

Which is interesting as I wouldn’t expect this code to behave as it does.

[marcdefiant]

As for the snippet of code I used, (outside of the anonymous function) I just grabbed from some blog, I can’t remember

[marcdefiant]

I’m looking for a deeper understanding as to how to pass variables in this manor and wrap my head around exactly what is happening here.

I apologize for not being more clear about what I’m asking for. I’ve been playing with php for the better part of 6 years now, and feel I’ve become stagnant in my learning so I’ve started looking for more advanced concepts to further my knowledge in php when I came across this snippet I use in my themes.

I appreciate your time and responses.

[Author]

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