I am trying to run processes using proc_open() function. As specified on the page - I supplied the custom environment variables and tried to print out. It shows all of my supplied variables + always 3 variables : 'SHLVL', 'PWD', '_='. I would like to print/use only my supplied environment variables. Are these 3 always present with this function? Is there any way to have only provided variables? This is all under Linux and PHP5.
//Here is the code to clarify :
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("file", "/tmp/error-output.txt", "a") // stderr is a file to write to
);
$env = array('MY_VAR' => 'FOO');
$process = proc_open('./run.php', $descriptorspec, $pipes, $cwd, $env);
if (is_resource($process)) {
fwrite($pipes[0], escapeshellcmd($args));
fclose($pipes[0]);
$output = "";
while (!feof($pipes[1])) {
$output .= fgets($pipes[1]);
}
print "Output is $output \n";
fclose($pipes[1]);
$return_value = proc_close($process);
}
Thanks.
You could namespace your environment variables, e.g. PHP_MYVAR instead of MYVAR. This way you can filter based on the common prefix PHP_.
Those three variables are created by the shell. If you don't open a shell, they won't be created.
It was just related to Linux. It works as it supposed to under Solaris. I added regex filter to remove those extra variables.
Related
I am running a command using shell_exec()
Let's say I have 400 directories and I can not wait for the command to run completely.
Is there a way, I can get the output Asynchronous?
$output = shell_exec('ls');
echo "<pre>$output</pre>";
$cmd = $command;
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("pipe", "w") // stderr is a pipe that the child will write to
);
flush();
$process = proc_open($cmd, $descriptorspec, $pipes, realpath('./'), array());
echo "<pre>";
if (is_resource($process)) {
while ($s = fgets($pipes[1])) {
print $s;
flush();
}
}
echo "</pre>";
The Code above Worked perfectly for me, This is copied from another answer I can no longer find. If you put a ping 127.0.0.1 in the $command it works exactly like it does in a terminal.
Check this: Is there a way to use shell_exec without waiting for the command to complete?
And instead of redirecting to /dev/null you could redirect to a tmp file that you read later.
I have a Python script that prompts the user for inputs.
input = raw_input("Enter input file: ")
model = raw_input("Enter model file: ")
While I can use the following PHP command to execute the script, how can I provide inputs when prompted?
$output = shell_exec("python script.py");
Also, like shell_exec(), I want to return all lines of output, not just the first/last line printed.
Solution that worked:
$descriptorspec = array(
0 => array("pipe", "r"),
1 => array("pipe", "w")
);
$process = proc_open('python files/script.py', $descriptorspec, $pipes, null, null); // run script.py
if (is_resource($process)) {
fwrite($pipes[0], "files/input.txt\n"); // input 1
fwrite($pipes[0], "files/model.txt\n"); // input 2
fclose($pipes[0]); // has to be closed before reading output!
$output = "";
while (!feof($pipes[1])) {
$output .= fgets($pipes[1]);
}
fclose($pipes[1]);
proc_close($process); // stop script.py
echo ($output);
}
Reference: Piping between processes in PHP
I propose to concatenate all output lines with a delimiter character like $ and decompose it on the PHP side using explode function to have an array.
I have a PHP script that calls a Python script which loops through a text file outputting specific lines to the webpage. The PHP script calls the Python script and echoes its output like this...
$output = shell_exec($command);
echo ($output);
The relevant Python code is this...
for myStr in myList:
myObj=re.match(r'(\s|\S)+\[(?P<specificVal>\d+)(\s|\S)+',myStr)
specificVal = int(myObj.group('specificVal'))
if specificVal in range(min,max):
print ('<p>%s</p>' % (myStr))
This works for about a hundred lines then it stops outputting, when there might be as many as a few thousand. Is there a better way to do this, or do I just need to edit some php.ini options? Thank you!
This could have to do with shell_exec() not returning all of the output for some reason. You could try using the more-robust proc_open():
<?php
$fileDescriptors = array(
0 => array("pipe", "r"), // STDIN
1 => array("pipe", "w"), // STDOUT
2 => array("pipe", "w") // STDERR
);
$pipes = array();
flush();
$process = proc_open($command, $fileDescriptors, $pipes, realpath('.'), array());
if (!is_resource($process))
{
error_log("Failed to execute '$command'");
return;
}
while ($data = fgets($pipes[1]))
{
print $data;
flush();
}
You might gain some performance benefit from not calling flush(); on every loop iteration as well.
If this still isn't giving you all of the output, I would be suspicious of a problem in the Python script, and you should post more of it to make it easier to debug.
i'm trying to write a php page that
call for a server program like
gdb
the problem is if i did
<?php
exec(" gdb code", $out);
?>
the PHP call for the command and exist
BUT what i want to do is like open a "terminal" session
where the user enter commands in that program like
gdb code
..
break main
..
run
and after each command i give him the output and he give me the next command
and it won't work if i did it like this
<?php
exec(" gdb code", $out);
exec(" break", $out);
exec(" run", $out);
?>
and the PHP can be run from a browser
and i tried it with pro_open
<?php
$descriptorspec = array(
0 => array("pipe", "r"),
1 => array("pipe", "w"),
2 => array("file", "/var/www/err.log", "a")
);
$cwd = '/var/www';
$env = array('some_option' => 'aeiou');
$StdErr='';
$process = proc_open('/bin/bash', $descriptorspec, $pipes, $cwd, $env);
if (is_resource($process)) {
fwrite($pipes[0], "gcc code ");
fwrite($pipes[0], " break main");
fflush($pipes[0]);
fclose($pipes[0]);
while(!feof($pipes[1])) {
echo fgets($pipes[1], 1024);
}
echo $StdErr;
fclose($pipes[1]);
$return_value = proc_close($process);
echo "command returned : $return_value\n";
}
and thank you .
Edit just saw you do try it from a browser. There is absolutely no simple way to do this. If you want an interactive session from the browser, you must run a separate daemon process and forward commands to it from PHP (and return output).
This is not simple at all; so if you still feel like doing this.. I would recommend starting with how to create a deamon; and then write a tcp socket server (or other IPC).
Excuse the crappy grammar
I've this shell script running from a PHP site.
In the shell script (Audit shell script),
I have 3 options:
1) Process script
2) Display results
3) Exit
Tried the codes below and doesn't seem to work, the PHP site displayed blanks.
<?php
session_start();
exec('/Desktop/test.sh');
exec('1');
$output = exec('2');
echo "<pre>$output</pre>";
?>
Any help will be greatly appreciated.
<?php
session_start();
// This line executes '/Desktop/test.sh' as if it had been called from the
// command line
// exec('/Desktop/test.sh');
// This line attempts to execute a file called '1', which would have to be
// in the same directory as this script
// exec('1');
// This line attempts to execute a file called '2', which would have to be
// in the same directory as this script, and capture the first line of the
// output in $output
// $output = exec('2');
// I think you want to be doing something more like this - this executes the
// shell script, passing "1" and "2" as arguments, and captures the whole
// output as an array in $output
exec('/Desktop/test.sh "1" "2"', $output);
// Loop the output array and echo it to the browser
echo "<pre>";
foreach ($output as $lineno => $line) echo "Line $lineno: $line\n";
echo "</pre>";
?>
It seems to me that you could do with reading the manual page for exec() properly...
Try using proc_open instead of exec; it gives you more control of process input/output. Something like:
<?php
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("file", "/dev/null", "a") // stderr is a file to write to
);
$cwd = '/Desktop';
$env = array();
$process = proc_open('/Desktop/test.sh', $descriptorspec, $pipes, $cwd, $env);
if (is_resource($process)) {
// $pipes now looks like this:
// 0 => writeable handle connected to child stdin
// 1 => readable handle connected to child stdout
// Any error output will be sent to /dev/null (ie, discarded)
fwrite($pipes[0], "1\n");
fwrite($pipes[0], "2\n");
fclose($pipes[0]);
$output = stream_get_contents($pipes[1]);
fclose($pipes[1]);
// It is important that you close any pipes before calling
// proc_close in order to avoid a deadlock
$return_value = proc_close($process);
echo $output;
}
?>
Note: I've lifted this code from the PHP Manual's proc_open page