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the parsing function has an extended version that allows for an additional flags argument that controls its actions.
int zend_parse_parameters_ex( int flags, int num_args tsrmls_dc, char *type_spec,...);

persistent is a flag the controls whether the stream is opened as a persistent stream. generally speaking, this parameter will usually be 0.
generally speaking, this parameter will usually be 0.

php_stream_sock_open_from_socket() returns a stream based on the socket. persistent is a flag that controls whether the stream is opened as a persistent stream. generally speaking, this parameter will usually be 0.
generally speaking, this parameter will usually be 0.