PHP - Write text file content in another text file

Question

I want to check if the content of a text file is the same as another, and if it isn't, write one into the other. My code is as follows:

<?php $file = "http://example.com/Song.txt";
$f = fopen($file, "r+");
$line = fgets($f, 1000);
$file1 = "http://example.com/Song1.txt";
$f1 = fopen($file1, "r+");
$line1 = fgets($f1, 1000);
if (!($line == $line1)) {
    fwrite($f1,$line);
    $line1 = $line;
    };
print htmlentities($line1);
?>

The line is being printed out, but the content isn't being written in the file.

Any suggestions about what might be the problem?

BTW: Im using 000webhost. I'm thinking it's the web hosting service but I've checked and there shouldn't be a problem. I've also checked the fwrite function here: http://php.net/manual/es/function.fwrite.php. Please, any help will be very aprecciated.

Tasos Bitsios · Accepted Answer · 2013-05-08 23:36:12Z

1

What you're doing will only work for files up to 1000 bytes. Also - you're opening the second file, which you want to write to, using "http://", which means that fopen internally will use an HTTP URL wrapper. These are read-only by default. You should fopen the second file using its local path. Or, to make this simpler, you can do this:

$file1 = file_get_contents("/path/to/file1");
$path2 = "/path/to/file2";
$file2 = file_get_contents($path2);
if ($file1 !== $file2)
    file_put_contents($path2, $file1);

answered May 8, 2013 at 23:36

Tasos Bitsios

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3 Comments

fpolloa Over a year ago

OK! I fixed the path and it worked. There was no need to change the permissions... Thanks to both anyway!

Tasos Bitsios Over a year ago

Glad it worked for you, and no worries. However, it is customary to accept one of the solutions that helped you out. Thanks!

Tasos Bitsios Over a year ago

Also - if you kept your code, be aware of the 1000-byte limitation (from fgets($f, 1000))

Twisted1919 · Accepted Answer · 2013-05-08 23:35:52Z

1

When working with files you will want to use PATHS not URLS.
So
$file = "http://example.com/Song.txt"; becomes
$file = "/the/path/to/Song.txt";

$file1 = '/absolute/path/to/my/first/file.txt';
$file2 = '/absolute/path/to/my/second/file.txt';
$fileContents1 = file_get_contents($file1);
$fileContents2 = file_get_contents($file2);
if (md5($fileContents1) != md5($fileContents2)) {
    // put the contents of file1 in the file2
    file_put_contents($file2, $fileContents1);
}

Also, you should check that your files are writable by the webserver, that is 0666 permission.

answered May 8, 2013 at 23:35

Twisted1919

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6 Comments

fpolloa Over a year ago

Thanks! I will check the 0666 permission.

Tasos Bitsios Over a year ago

detail: you don't need 0666 permissions if the php process owner owns (or group-owns) the file and enclosing directory.

Twisted1919 Over a year ago

@TasosBitsios - why complicate things for him? Let the man set that permission, we don't know what kind of environment he is using :)

fpolloa Over a year ago

OK! I fixed the path and it worked. There was no need to change the permissions... Thanks to both anyway!

Tasos Bitsios Over a year ago

no need to complicate his life indeed, but since this could be used as a reference by someone else, strictly speaking "writable by the webserver" !== 0666 permission :)

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