How to get output from executable file in php

Question

I can't get output from executable file (a.out) via php. my php code is :

$file = "/path/main.cpp";
$command="cd $path && c++ -lm ".$file;
exec($command);
$output = exec("cd $path && ./a.out");
exec("cd $path && ./a.out > res.txt");
var_dump($output);

all commands is executed but, I'm getting empty value;

exec("cd $path && ./a.out > res.txt");

this command also executed, res.txt was created in folder, but empty file. How to solve this problem? My OS is CentOS 7

Regarding the "empty file" from the redirection, are you sure that the program actually generates any output? Or that the compilation succeeded and the a.out program existing? — Some programmer dude
– Some programmer dude, Commented Nov 18, 2019 at 8:37
Try capturing the error output as well, see if it's failing (stackoverflow.com/questions/3863699/…). — Nigel Ren
– Nigel Ren, Commented Nov 18, 2019 at 8:41

user2342558 · Accepted Answer · 2019-11-18 08:46:21Z

0

In order to get the output of a command with PHP, you can use the shell_exec function:

shell_exec

shell_exec — Execute command via shell and return the complete output as a string

So, try this:

$output = shell_exec("cd $path && ./a.out");

answered Nov 18, 2019 at 8:46

user2342558

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4 Comments

Bakhodir Ismatov Over a year ago

sh: ./a.out: Permission denied

user2342558 Over a year ago

@BakhodirIsmatov so the problem is another... when you resolve it, shell_exec will do what you need

Bakhodir Ismatov Over a year ago

can apache run a.out ?

user2342558 Over a year ago

@BakhodirIsmatov try to run it from terminal if you can, otherwise try to run this in shell_exec: echo shell_exec('echo "it works";');. Because I don't know what does a.out contain, I can't help you on that.

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