socket_set_option Sets socket options for the socket boolsocket_set_option resourcesocket intlevel intoptname mixedoptval The socket_set_option function sets the option specified by the optname parameter, at the protocol level specified by the level parameter, to the value pointed to by the optval parameter for the socket specified by the socket parameter. socket_set_option will return &false; on failure. The level parameter specifies the protocol level at which the option resides. For example, to retrieve options at the socket level, a level parameter of SOL_SOCKET would be used. Other levels, such as TCP, can be used by specifying the protocol number of that level. Protocol numbers can be found by using the getprotobyname function. The available socket options are the same as those for the socket_get_option function. This function used to be called socket_setopt prior to PHP 4.3.0.