Removing tooltips

  • vjoshi29

    (@vjoshi29)


    12 years, 9 months ago

    Hi,

    I found the below code to remove tooltips from navigation menu in Twenty ten theme

    function remove_title($input) {
  return preg_replace_callback('#\stitle=["|\'].*["|\']#',
    create_function(
      '$matches',
      'return "";'
      ),
      $input
    );
  }
add_filter('wp_list_pages','remove_title');

    It works but can anyone please go through the code and explain what each line does. I want to learn about how all the functions work.

    Thanks!

Viewing 2 replies - 1 through 2 (of 2 total)
  • s_ha_dum

    (@apljdi)

    12 years, 9 months ago

    line 1: the function keyword identifying this as a declaration followed by the function name and in this case one parameter.

    line 2: the keyword return means ‘send the following back to whatever called the function’. In this case what is going to be returned is the output from a function called preg_replace_callback(). This is a PHP function. You can look it up for the details but basically it lets you search and replace a string using a pattern matching syntax called regular expressions– Perl compatible regular expressions in this case. Regular expressions are a mind bending language in there own right so you will need to spend some time understanding that.

    line 3: preg_replace_callback() lets the author of the code provide a function to process the match. You can use built in functions like strtolower() or write your own just like remove_title or, as in this case, use a kind of disposable one time nameless function. create_function() is a PHP builtin that lets you write this anonymous function. So, if you look at preg_replace_callback() you have three parameters separated by commas– the pattern to match, the callback and the input value.

    The last line adds the remove_title function to the WordPress filter hook named ‘wp_list_pages’.

    There ya go.

    Thread Starter vjoshi29

    (@vjoshi29)

    12 years, 9 months ago

    Thanks. I need to understand why that particular regular expression pattern is used here.

Viewing 2 replies - 1 through 2 (of 2 total)
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