从PHP调用无尽的Python脚本 [英] Calling a endless Python script from PHP
问题描述
我有一个调用python脚本的PHP脚本.两者都在同一台Linux服务器上运行.
I have a PHP script that calls a python script. Both running on the same Linux server.
Python脚本在"while true"循环中运行.现在，当我启动PHP脚本时，它仍然处于无休止的循环中，并且永无止境.
The Python script is running in a "while true" loop. Now when I start the PHP script, it remains in an endless loop and never ends.
如果我在Python中删除循环，则PHP运行正常.
If i delete the loop in Python, PHP is running normaly.
PHP:
<html>
<head>
<title>PHP</title>
</head>
<body>
<?php
shell_exec('sudo python /home/pi/blink.py 1);
?>
</body>
</html>
Python:
#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
import sys
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.cleanup()
GPIO.setup(4, GPIO.OUT)
def blink(self):
while True:
time.sleep(0.5);
GPIO.output(4, GPIO.LOW)
time.sleep(0.5);
GPIO.output(4, GPIO.HIGH)
if str(sys.argv[1]) is '1':
blink("")
else:
GPIO.output(4, GPIO.LOW)
如何使用PHP使用无限循环正确启动Python脚本?
How do I properly start a Python script with an infinite loop using PHP?
推荐答案
好的，一种选择是包括Linux'&'在您的shell_exec()函数中.这使命令在后台运行，但是您无法从脚本内(轻松)停止它. 然后，代码变成(请注意'&'):
Alright, one option is to include the Linux '&' in your shell_exec() function. This makes the command run in the background, you can't stop it (easily) from within the script though. Code then becomes (note the '&'):
<html>
<head>
<title>PHP</title>
</head>
<body>
<?php
shell_exec('sudo python /home/pi/blink.py 1 &');
?>
</body>
</html>
这将使脚本永久在后台运行，或者至少在重新启动Pi之前.
This makes the script run in the background forever, or at least until the Pi is rebooted.
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