(PHP 5, PHP 7, PHP 8)
php_user_filter::onCreate — Called when creating the filter
This method is called during instantiation of the filter class object. If your filter allocates or initializes any other resources (such as a buffer), this is the place to do it.
   When your filter is first instantiated, and
   yourfilter->onCreate() is called, a number of properties
   will be available as shown in the table below.
  
| Property | Contents | 
|---|---|
FilterClass->filtername | 
       A string containing the name the filter was instantiated with. Filters may be registered under multiple names or under wildcards. Use this property to determine which name was used. | 
FilterClass->params | 
       
        The contents of the params parameter passed
        to stream_filter_append()
        or stream_filter_prepend().
        | 
      
FilterClass->stream | 
       
        The stream resource being filtered. Maybe available only during
        filter() calls when the 
        closing parameter is set to false.
        | 
      
This function has no parameters.