This function is a wrapper for Apache's table_get and table_set. It edits the table of notes that exists during a request. The table's purpose is to allow Apache modules to communicate.
The main use for apache_note() is to pass information from one module to another within the same request.
The name of the note.
The value of the note.
If note_value is omitted or null, it returns the current value of note note_name. Otherwise, it sets the value of note note_name to note_value and returns the previous value of note note_name. If the note cannot be retrieved, false is returned.
note_value is nullable now.
Example #1 Passing information between PHP and Perl
You can also get at the value of the common CGI variables by reading them from the environment, which works whether or not you are using PHP as an Apache module. Use phpinfo() to see a list of all of the available environment variables.