(PHP 4, PHP 5, PHP 7)
fwrite — Binary-safe file write
$handle
, string $string
[, int $length
] )
fwrite() writes the contents of
string to the file stream pointed to by
handle.
handleO resursă de tip indicator în sistemul de fișiere care este în mod tipic creată utilizând fopen().
stringThe string that is to be written.
length
If the length argument is given, writing will
stop after length bytes have been written or
the end of string is reached, whichever comes
first.
Note that if the length argument is given,
then the magic_quotes_runtime
configuration option will be ignored and no slashes will be
stripped from string.
fwrite() returns the number of bytes
written, or FALSE on error.
Notă:
Writing to a network stream may end before the whole string is written. Return value of fwrite() may be checked:
<?php
function fwrite_stream($fp, $string) {
for ($written = 0; $written < strlen($string); $written += $fwrite) {
$fwrite = fwrite($fp, substr($string, $written));
if ($fwrite === false) {
return $written;
}
}
return $written;
}
?>
Notă:
On systems which differentiate between binary and text files (i.e. Windows) the file must be opened with 'b' included in fopen() mode parameter.
Notă:
If
handlewas fopen()ed in append mode, fwrite()s are atomic (unless the size ofstringexceeds 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 flock() a resource before calling fwrite(); all of the data will be written without interruption.
Notă:
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!
?>
Example #1 A simple fwrite() 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 $somecontent will go when we fwrite() it.
if (!$handle = fopen($filename, 'a')) {
echo "Cannot open file ($filename)";
exit;
}
// Write $somecontent to our opened file.
if (fwrite($handle, $somecontent) === FALSE) {
echo "Cannot write to file ($filename)";
exit;
}
echo "Success, wrote ($somecontent) to file ($filename)";
fclose($handle);
} else {
echo "The file $filename is not writable";
}
?>