How to execute a script from PHP

Question

I have a PHP script that should run a Python script, what i try. Nothing seems to work. I gived the script and the PHP script full permission (777). The way that i use to execute my Python script in php is:

    <?php 


    shell_exec('python /var/www/html/send.py');
    system('python /var/www/html/send.py');

    ?>

I tried a couple of methodes that are in the code above, but nothing seems to solve the issue. The strange thing is that the command is working fine when i execute it in Putty. So i don't know what could be the problem. The permissions must be right.

I found a few ways on Stack Overflow, but nothing has the same issue as me. This is the code that should be executed:

#!/usr/bin/env python

import sys                              #import sys
import serial                           #import Serial
import time

ser = serial.Serial ("/dev/ttyS0")      #Open onze poort
ser.baudrate = 9600                     #Baudrate instellen

adres = 2
data = 1

print adres                             #Debug Info
print data                              #Debug Info

byte = chr(int(adres))                  # Omzetten adres naar Byte
ser.write(byte)                         # Uitsturen van adres over Serieeel
time.sleep(0.5)                         # Wachten (Atmel kan sloom zijn)
byte2 = chr(int(data))                  # Omzetten data naar Byte
ser.write(byte2)                        # Uitsturen van data over Serieeel

ser.close()                             # Seriele poort sluiten

Possible duplicate of [Running a Python script from PHP](https://stackoverflow.com/questions/19735250/running-a-python-script-from-php) — Rushikumar, Jun 28 '17 at 11:27
The script should send serial data from its UART. But this works fine trough Putty. So i know that something is wrong with the PHP part. — matthias schuurhof, Jun 28 '17 at 11:32
Its not a duplicate, because i tried that part. But seems not to work... — matthias schuurhof, Jun 28 '17 at 11:34
is the program Python in the default search path? Could you try using the full path to python? — Ivo P, Jun 28 '17 at 11:36
I meant the path to python: for me it is at `/usr/bin/python` . You can find it `which python` — Ivo P, Jun 28 '17 at 11:42
/usr/bin/python. I changed it in the Pyton script, but seems not to change anything.. — matthias schuurhof, Jun 28 '17 at 11:44
@AlexanderMP Maybe, i gived full permission for whole /html folder... But no change. — matthias schuurhof, Jun 28 '17 at 11:46
modify the command line `python /path/to/script > out.txt 2> error.log` Then check what's in out.txt and error.log — Alex, Jun 28 '17 at 11:48
Does the user that runs the web server have permissions to write to the serial port device? — fredrik, Jun 28 '17 at 11:50
I got a message from the error log that the permission was denied. [Errno 13] Permission denied: '/dev/ttyS0' So i guess that the user that runs the server don't have the permission... How do i give this to it? — matthias schuurhof, Jun 28 '17 at 11:53
do a `ls -al /dev` and look for the user and group who has access. Second one is the group. Now you must add the user that runs the web server to the group who has access to the device. — Alex, Jun 28 '17 at 11:58

score 0 · Answer 1 · answered Jun 28 '17 at 11:47

0

Be sure that you have enabled exec in php.ini and just put into php code this

<?php 
exec('python /var/www/html/send.py');

I think, you should run python from php's tree. For example:

php script
/var/www/run.php

python script:
/var/www/python/send.py

after that everything should be ok

answered Jun 28 '17 at 11:47

Filip

143
12

Maybe you have problem with permissions of php-fpm user? – Filip Jun 28 '17 at 13:12

How to execute a script from PHP

1 Answers1