fgets() and fread() - What is the difference?

Question

I understand the differences between fgets() and fgetss() but I don\'t get the difference between fgets() and fread()<

Answer 1

fread() for binary data and fread has a limit on how many chars you can read

$source_file = fopen( $filename, "r" ) or die("Couldn't open $filename");
while (!feof($source_file)) {
    $buffer = fread($source_file, 5);  
   var_dump($buffer); //return string with length 5 chars!
}

Number 5 is length bytes have been read .