PHP - youtube-dl: command not found

[clarityworld]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.02.01. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• [X ] I've verified and I assure that I'm running youtube-dl 2017.02.01

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• [ X] At least skimmed through README and most notably FAQ and BUGS sections
• [ X] Searched the bugtracker for similar issues including closed ones

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Hello!
I'm trying to run youtube-dl via PHP. It's all working when im logged in on Terminal.
When I try to run via exec, I get this Eerror:"sh: youtube-dl: command not found"
My Php
<?php $cmd = 'youtube-dl https://www.youtube.com/watch?v=jRpp--g3oNY'; exec($cmd." 2>&1", $output); echo "<pre>"; var_dump($output); echo "</pre>"; ?>

array(1) {
[0]=>
string(33) "sh: youtube-dl: command not found"
}

[yan12125]

Most likely $PATH is not correctly set. You may want to use absolute paths.

[clarityworld]

Dare to explain a little more. I don't know. $PATH is something server side ,or in the php file?

[clarityworld]

Added:
putenv('PATH=/usr/local/bin');
Now
string(47) "/usr/bin/env: python: No such file or directory"

[yan12125]

putenv is the correct way, but /usr/local/bin is not enough. /usr/local/bin:/usr/bin should work I guess.

[clarityworld]

Thank you !

[QianMuXiao]

youtube-dl install successfully
but when I type youtube-dl -H
it just shows
zsh: command not found: youtube-dl