fwrite

fwrite

Binary-safe file write

 **fwrite** resource $stream string $data  $length

writes the contents of
to the file stream pointed to by

. fwrite``data``stream

stream``dataThe string that is to be written.

length If is an integer, writing will stop after bytes have been written or the end of is reached, whichever comes first. length``length``data

returns the number of bytes

written, return.falseforfailure. fwrite

raises  on failure.

fwrite``E_WARNING

Voorbeeld: A simple example

<?php
$filename = 'test.txt';
$somecontent = "Add this to the file\n";

// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {

    // In our example we're opening $filename in append mode.
    // The file pointer is at the bottom of the file hence
    // that's where $somecontent will go when we fwrite() it.
    if (!$fp = fopen($filename, 'a')) {
         echo "Cannot open file ($filename)";
         exit;
    }

    // Write $somecontent to our opened file.
    if (fwrite($fp, $somecontent) === FALSE) {
        echo "Cannot write to file ($filename)";
        exit;
    }

    echo "Success, wrote ($somecontent) to file ($filename)";

    fclose($fp);

} else {
    echo "The file $filename is not writable";
}
?>

Opmerking: > Writing to a network stream may end before the whole string is written. Return value of may be checked:

`fwrite````php

Opmerking: > On systems which differentiate between binary and text files (i.e. Windows) the file must be opened with 'b' included in mode parameter. fopen

Opmerking: > If was ed in append mode, s are atomic (unless the size of exceeds the filesystem's block size, on some platforms, and as long as the file is on a local filesystem). That is, there is no need to a resource before calling ; all of the data will be written without interruption. stream``fopen``fwrite``data``flock``fwrite

Opmerking: > If writing twice to the file pointer, then the data will be appended to the end of the file content:

<?php
$fp = fopen('data.txt', 'w');
fwrite($fp, '1');
fwrite($fp, '23');
fclose($fp);

// the content of 'data.txt' is now 123 and not 23!
?>

fread``fopen``fsockopen``popen``file_get_contents``pack