Re: what is the main difference between fread() and readfile()?

On Sun, Aug 10, 2014 at 6:59 PM, Negin Nickparsa <nickparsa@gmail.com> wrote: > > > > Sincerely > Negin Nickparsa > > > On Sun, Aug 10, 2014 at 3:57 PM, Aziz Saleh <azizsaleh@gmail.com> wrote: > >> >> >> >> On Sun, Aug 10, 2014 at 6:31 PM, Negin Nickparsa <nickparsa@gmail.com> >> wrote: >> >>> fread >>> (PHP 4, PHP 5) >>> >>> fread — Binary-safe file read >>> Description ¶ >>> < >>> >>> http://us1.php.net/manual/en/function.fread.php#refsect1-function.fread-description½5¹¼ AÙ> >>> óˆ©ø >>> > >>> >>> string fread ( resource $handle , int $length ) >>> >>> fread() reads up to length bytes from the file pointer referenced by >>> handle. >>> Reading stops as soon as one of the following conditions is met: >>> readfile >>> >>> (PHP 4, PHP 5) >>> >>> readfile — Outputs a file >>> Description ¶ >>> < >>> >>> http://us3.php.net/manual/en/function.readfile.php#refsect1-function.readfile-description >>> > >>> >>> int readfile ( string $filename [, bool $use_include_path = false [, >>> resource $context ]] ) >>> >>> Reads a file and writes it to the output buffer. >>> >>> in which condition it's better to use them? I confronted a question that >>> is >>> asking which of the following functions reads the entire contents of a >>> file? >>> >>> A.fgets >>> >>> B.file_get_contents >>> >>> C.fread() >>> >>> D.readfile() >>> >>> E.file() >>> >>> in my opinion the answer is B,C,D,E >>> >>> but the answer key is telling me the answer is B,D,E so fread for some >>> reason is not the answer and I cannot understand. >>> >>> *john coggshall and Marco Tabini test book* >>> >> >> file_get_contents, file, and readfile all take the filename location as >> oppose to fgets/fread which require file pointers - requiring you to open >> the file first (via fopen for example). >> > ​so fread is reading the entire file?​ > > No. fread reads a file pointer (not the file location). You can use fread/fgets to read the entire file content, but you need to open a file pointer first with fopen and know the size of the file with filesize.