使用PHP exec（）实时输出到文件？

Question

On Windows, I use PHP to execute a gulp command.

Like this :

<?php

     set_time_limit(0);

     exec("cd /projectpath");
     $results = exec("gulp");
?>

This works, but I can only get the results of the command after it has finished, which takes about 30 seconds.

I would like to write the results to a file, while it is running , so I can poll the progress in an interval using Ajax.

In a normal command prompt I can do

gulp > results.txt 2>&1

and the text file is being filled while the command is running.

I already tried shell_exec (), system () and passthru () too, but I can't get this to work from within PHP.

Any idea's ?

Answer 1

Why not just call exec() in the way you proposed?

<?php

     set_time_limit(0);

     exec("cd /projectpath");
     $results = exec("gulp > results.txt 2>&1");
?>

Answer 2

Use proc_open :

<?php
$cmd = 'for i in $(seq 20); do sleep 1; echo $i; done';
$cwd = '/';
$descriptors = array(
    0 => array('pipe', 'r'),
    1 => array('file', 'stdout', 'w'),
    2 => array('file', 'stderr', 'w'),
);

$handle = proc_open($cmd, $descriptors, $pipes, $cwd);
if (!$handle) {
    echo 'failed to run command';
} else {
    proc_close($handle); // wait for command to finish (optional)
}