php socket programming read and write functions

fwrite () end binary security conditions [string written /-length. 1 ];
 fputs ()   fwrite () alias;

fread () binary security, end condition [available packet / EOF / length-1 / Timeout];
 fgets () to read a line, end condition [newline / EOF / length-1 / Timeout], length 1024 default;

feof () encountered [EOF / Error] will return to true;