Execute shell, get and display result realtime using PHP

Question

I need to do some long process using Python which will be called using PHP(my main language) and display the result real time.

Lets say this is my Python script(a.py).

import time

for x in range(10):
    print "S;adasdasd;",x
    time.sleep(0.5)

I have try so many example from internet but always get same result. PHP always wait until script is done then displaying it.

Here is one of so many code i have tried.

    header( 'Content-type: text/html; charset=utf-8' );
    $handle = popen('python folder\\a.py', 'r');
    while (!feof($handle)) {
            echo fgets($handle);
            flush();
            ob_flush();
    }
    pclose($handle);

Did I miss something?

Try adding a character set as a header in your PHP. See here: http://stackoverflow.com/a/12740522/128161 — Jamie Bicknell, Jun 28 '16 at 08:55
How about using `fread($handle, 1024); ` instead of `fgets`? — Jamie Bicknell, Jun 28 '16 at 09:00
nope.still gives me the same result, did i need to config my PHP or something? — Ryan Arief, Jun 28 '16 at 09:04
I'm not sure to be honest. It could be something to do with `popen` rather than using `fopen`. Is it possible you could alter the code slightly to use `fopen` and set the URL to a website and just output the contents line by line. If that works then the issue would lie within `popen` rather than your server config, so may help to narrow down the issue. — Jamie Bicknell, Jun 28 '16 at 09:08

score 5 · Accepted Answer · edited May 23 '17 at 11:52

5

PHP always wait until script is done then displaying it.

In this case, it's not PHP's fault; it's because Python fully buffers its standard output if that goes to a pipe. Fortunately, Python has the handy option -u to disable stdout and stderr buffering, so using

    $handle = popen('python -u folder\\a.py', 'r');

solves the problem. See also Disable output buffering.

edited May 23 '17 at 11:52

Community

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answered Jul 20 '16 at 06:15

Armali

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Been looking for a solution for long and this really fixed it. Can't believe it was that simple. – user5740843 Dec 01 '16 at 10:26

Execute shell, get and display result realtime using PHP

1 Answers1