PHP file operation reads a file (opens in binary read-only mode)

Recently applied the file read, by the way review!

//read a file$f=fopen($filename, ' RB ');$f:represents a resource handle that is returned$filename:file path to open RB:parameter that represents read-only and opens the file in binary form after reading the file data, because reading the file is a line of//Loop If no read to the end of the file while(!feof($f)) {      $str=fgets($f);//gets the data for each row      /*operation code for this data ...*/}//Close the resourcefclose($f);

PHP file operation reads a file (opens in binary read-only mode)