Calling node from a PHP script

Question

I'm trying to call a node script from a PHP script using exec:

$output = exec("/usr/bin/node /home/user/nodescript.js");

The nodescript.js being:

var Scraper = require('google-images-scraper');

var keywords = process.argv[2];

var scraper = new Scraper({
    keyword: keywords,
    rlimit: 10, // 10 p second
});
console.log("foo");
scraper.list(10).then(function (res) {
    console.log("bar");
    console.log(res);
});
setTimeout(function () {
    process.exit(1);
}, 20000)

But what I receive is the string "foo", and not the "bar". If I run the node script from command line, I do get "foo" and "bar". Somehow I don't receive any console output inside the function. What am I doing wrong?

stackoverflow.com/questions/49756235

T.Todua
– T.Todua

2021-01-31 19:25:06 +00:00
Commented Jan 31, 2021 at 19:25 — T.Todua
– T.Todua, Commented Jan 31, 2021 at 19:25

abeyaz · Accepted Answer · 2016-01-20 19:26:09Z

2

First of all, you cant get the output of exec command directly. You need to define 2nd argument as in the docs.

exec("node yourfile.js", $output); 
echo implode("\n", $output);

answered Jan 20, 2016 at 19:26

abeyaz

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Paul Carlton · Accepted Answer · 2016-01-20 19:31:57Z

0

I've run into this when executing python scripts. For some reason the last line disappears. Try adding 2>&1 to your script and change exec to shell_exec which will return a string including error output. See if that helps.

$output = shell_exec("/usr/bin/node /home/user/nodescript.js 2>&1");

I know that the 2>&1 allows for the script to pass error and debugging output to the standard output since they go through a error output. I had to do this to debug my scripts and the last line reappeared.

answered Jan 20, 2016 at 19:31

Paul Carlton

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2 Comments

Amarnasan Over a year ago

No... still the same. I think it is more related to apache can't run the script the same way my user does.

Paul Carlton Over a year ago

Are you getting any error output? Because that was my issue as well with python, passing errors allowed me to see permissions and directory issues so I could debug it. What also helps is setting up environment variables with putenv by repeating what's in your $PATH

Rolf · Accepted Answer · 2017-11-15 11:12:51Z

0

PHP 5.6 is bundled with the phpdbg interactive debugger. However, the documentation URL points to an expired domain, at the moment, so, yeah.

Source: https://stackoverflow.com/a/36131176/370786

answered Nov 15, 2017 at 11:12

Rolf

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