PHP Manual: stream_context_set

function stream_context_set_params(resource $context, array $params): true

Sets parameters on the specified context.

context

The stream or context to apply the parameters too.

params

An associative array of parameters to be set in the following format: $params['paramname'] = "paramvalue";.

**Supported parameters**
Parameter	Purpose
`notification`	Name of user-defined callback function to be called whenever a stream triggers a notification. Only supported for http:// and ftp:// stream wrappers.
`options`	Array of options as in context options and parameters.

Returns true on success or false on failure.

stream_context_set_params