how to redirect STDOUT to a file in PHP?

Question

The code below almost works, but it's not what I really meant:

ob_start();
echo 'xxx';
$contents = ob_get_contents();
ob_end_clean();
file_put_contents($file,$contents);

Is there a more natural way?

Answer 1

It is possible to write STDOUT directly to a file in PHP, which is much easier and more straightforward than using output bufferering.

Do this in the very beginning of your script:

fclose(STDIN);
fclose(STDOUT);
fclose(STDERR);
$STDIN = fopen('/dev/null', 'r');
$STDOUT = fopen('application.log', 'wb');
$STDERR = fopen('error.log', 'wb');

Why at the very beginning you may ask? No file descriptors should be opened yet, because when you close the standard input, output and error file descriptors, the first three new descriptors will become the NEW standard input, output and error file descriptors.

In my example here I redirected standard input to /dev/null and the output and error file descriptors to log files. This is common practice when making a daemon script in PHP.

To write to the application.log file, this would suffice:

echo "Hello world\n";

To write to the error.log, one would have to do:

fwrite($STDERR, "Something went wrong\n"); 

Please note that when you change the input, output and error descriptors, the build-in PHP constants STDIN, STDOUT and STDERR will be rendered unusable. PHP will not update these constants to the new descriptors and it is not allowed to redefine these constants (they are called constants for a reason after all).

Answer 2

here's a way to divert OUTPUT which appears to be the original problem

$ob_file = fopen('test.txt','w');

function ob_file_callback($buffer)
{
  global $ob_file;
  fwrite($ob_file,$buffer);
}

ob_start('ob_file_callback');

more info here:

http://my.opera.com/zomg/blog/2007/10/03/how-to-easily-redirect-php-output-to-a-file

Answer 3

None of the answers worked for my particular case where I needed a cross platform way of redirecting the output as soon as it was echo'd out so that I could follow the logs with tail -f log.txt or another log viewing app. I came up with the following solution:

$logFp = fopen('log.txt', 'w');

ob_start(function($buffer) use($logFp){
    fwrite($logFp, $buffer);
}, 1); //notice the use of chunk_size == 1

echo "first output\n";
sleep(10)
echo "second output\n";

ob_end_clean();

I haven't noticed any performance issues but if you do, you can change chunk_size to greater values.

Now just tail -f the log file:

tail -f log.txt

Answer 4

No, output buffering is as good as it gets. Though it's slightly nicer to just do

ob_start();
echo 'xxx';
$contents = ob_get_flush();
file_put_contents($file,$contents);

Answer 5

Using eio pecl module eio is very easy, also you can capture PHP internal errors, var_dump, echo, etc. In this code, you can found some examples of different situations.

$fdout = fopen('/tmp/stdout.log', 'wb');
$fderr = fopen('/tmp/stderr.log', 'wb');

eio_dup2($fdout, STDOUT);
eio_dup2($fderr, STDERR);
eio_event_loop();

fclose($fdout);
fclose($fderr);

// output examples
echo "message to stdout\n";

$v2dump = array(10, "graphinux");
var_dump($v2dump);

// php internal error/warning
$div0 = 10/0;

// user errors messages
fwrite(STDERR, "user controlled error\n");

Call to eio_event_loop is used to be sure that previous eio requests have been processed. If you need append on log, on fopen call, use mode 'ab' instead of 'wb'.

Install eio module is very easy (http://php.net/manual/es/eio.installation.php). I tested this example with version 1.2.6 of eio module.

Answer 6

You can install Eio extension

pecl install eio

and duplicate a file descriptor

$temp=fopen('/tmp/my_stdout','a');
$my_data='my something';
$foo=eio_dup2($temp,STDOUT,EIO_PRI_MAX,function($data,$esult,$request){
    var_dump($data,$esult,$request);
    var_dump(eio_get_last_error($request));
},$my_data);
eio_event_loop();
echo "something to stdout\n";
fclose($temp);

this creates new file descriptor and rewrites target stream of STDOUT

this can be done with STDERR as well

and constants STD[OUT|ERR] are still usable

Answer 7

I understand that this question is ancient, but people trying to do what this question asks will likely end up here... Both of you.

If you are running under a particular environment...

• Running under Linux (probably most other Unix like operating systems, untested)
• Running via CLI (Untested on web servers)

You can actually close all of your file descriptors (yes all, which means it's probably best to do this at the very beginning of execution... for example just after a pcntl_fork() call to background the process in a daemon (which seems like the most common need for something like this)

fclose( STDIN );  // fd 3
fclose( STDERR);  // fd 2
fclose( STDOUT ); // fd 1

And then re-open the file descriptors, assigning them to a variable that will not fall out of scope and thus be garbage collected. Because Linux will predictably open them in the proper order.

$kept_in_scope_variable_fd1 = fopen(...); // fd 1
$kept_in_scope_variable_fd2 = fopen(...); // fd 2
$kept_in_scope_variable_fd3 = fopen( '/dev/null', ... ); // fd 3

You can use whatever files or devices you want for this. I gave /dev/null as the example for STDIN (fd3) because that's probably the most common case for this kind of code.

Once this is done you should be able to do normal things like echo, print_r, var_dump, etc without specifically needing to write to a file with a function. Which is useful when you're trying to background code that you do not want to, or aren't able to, rewrite to be file-pointer-output-friendly.

YMMV for other environments and things like having other FD's open, etc. My advice is to start with a small test script to prove that it works, or doesn't, in your environment and then move on to integration from there.

Good luck.

Answer 8

Here is an ugly solution that was useful for a problem I had (need to debug).

if(file_get_contents("out.txt") != "in progress")
{
    file_put_contents("out.txt","in progress");
    $content = file_get_contents('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
    file_put_contents("out.txt",$content);
}

The main drawback of that is that you'd better not to use the $_POST variables. But you dont have to put it in the very beggining.