Storing state between hook functions

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I have two functions which I’m hooking into a plugin. Both functions are called (at different times) during a single page creation by the server.

I want to set a flag in function_a which can be read by function_b.

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Question: Is there any problem with just declaring my flag in the global scope? Is there a preferred WP-style for doing this?

ps. I realize that I will need to be defensive when function_b reads the flag–by making sure that the value was explicitly set, etc.

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1 comment

  1. Uing OOP for your plugin it’s very easy.

    class MyPlugin {

    static $flag;

    static function function_a() {
      self::$flag = 'a value';
    }

    static function function_b() {
      if ( ! is_null(self::$flag) ) echo self::$flag; // echo 'A Value';
    }

}

add_action('plugins_loaded', array('MyPlugin', 'function_a') );
add_action('init', array('MyPlugin', 'function_b') );

    Not using OOP you can use global variables. 

    function function_a() {
  global $myflag;
  $myflag = 'a value';
}

function function_b() {
  global $myflag;
  if ( ! is_null($myflag) ) echo $myflag; // echo 'A Value';
}

add_action('plugins_loaded', 'function_a' );
add_action('init', 'function_b' );

    This works and seems easier, but first solution is better for sure.

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