stream_set_blocking Set blocking/non-blocking mode on a stream boolstream_set_blocking resourcestream intmode If mode is 0, the given stream will be switched to non-blocking mode, and if 1, it will be switched to blocking mode. This affects calls like fgets and fread that read from the stream. In non-blocking mode an fgets call will always return right away while in blocking mode it will wait for data to become available on the stream. &return.success; This function was previously called as set_socket_blocking and later socket_set_blocking but this usage is deprecated. Prior to PHP 4.3, this function only worked on socket based streams. Since PHP 4.3, this function works for any stream that supports non-blocking mode (currently, regular files and socket streams). See also stream_select.