fwrite error -- not writing all

[sfullman]

I have set permissions on a file. I'm encountering a very unusual error. When I do fwrite(), It's stopping the write short of writing the whole string. Here is my code:

$virtHostFile=($_GET[editFile]?$_GET[editFile]:'/etc/httpd/conf/httpd.virtualhost');
if($_POST){
	echo 'writing file<br>';
	$fp=fopen($virtHostFile, 'w');
	$x=stripslashes($_POST[virtualhost]);
	$y=strlen($x);
	fwrite($fp,$x,$y);
}

What's wierd here is that the file is being written to, but only part of the file. Makes no sense. Yes, I have set permissions correctly.

Sam

[laserlight]

You might not need to specify the length for fwrite(), e.g.

if (!empty($_POST['virtualhost'])) {
	if (!empty($_GET['editFile'])) {
		$virtHostFile = $_GET['editFile'];
	} else {
		$virtHostFile = '/etc/httpd/conf/httpd.virtualhost';
	}
    echo 'writing file<br>';
    $str = stripslashes($_POST['virtualhost']);
    $fp = fopen($virtHostFile, 'w')
    	OR die("Could not open file '" . $virtHostFile . "'");
    fwrite($fp, $str)
    	OR die("Could not write to file '" . $virtHostFile . "'");
    fclose($fp);
}