PHP Manual: Called when creating the filter

Description

public bool php_user_filter::onCreate()

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`.

Parameters

This function has no parameters.

Return Values

Your implementation of this method should return false on failure, or true on success.