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The PHP socket set blocking() function sets blocking or blocking mode for resource streams

bool stream_set_blocking ( resource $stream , int $mode )

It is an alias for STREAM_SET_BLOCKING(), which has blocking or unblocking options for stream mode.

Returns true on success, otherwise returns false

Serial number	Parameters and descriptions
1	stream Resource stream
2	mode If mode is 0, the resource stream will be converted to non-blocking mode; if it is 1, the resource stream will be converted to blocking mode. The setting of this parameter will affect functions like fgets() and fread() that read data from the resource stream. In non-blocking mode, calling fgets() always returns immediately; in blocking mode, it will wait until data is obtained from the resource stream before returning.