sudo /script.py - read out temperature&humidty in .php - temperature

Question

I'm currently on a project with my Raspberry Pi B+.
I'm using a DHT22 - Temperature & Humidity Sensor. I'm also using Adafruit that's working together with python.
My Problem is, that I don't really know, how to read out a specific thing in my .php script that I want to implement in a index.php (Apache-Server).
I can read the Temperature & Humidity over putty with:
sudo /root/Adafruit_Python_DHT/examples/AdafruitDHT.py 22 4
while 22 is the DHT "22" Sensor - since there is an older one named "11" and 4 the GPIO of the raspberry.
putty is now telling this:
root#raspberrypi:~# sudo /root/Adafruit_Python_DHT/examples/AdafruitDHT.py 22 4
Temp=21.3* Humidity=41.6%
The AdafruitDHT.py for itself looks like this:
#!/usr/bin/python
# Copyright (c) 2014 Adafruit Industries
# Author: Tony DiCola
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import sys
import Adafruit_DHT
# Parse command line parameters.
sensor_args = { '11': Adafruit_DHT.DHT11,
'22': Adafruit_DHT.DHT22,
'2302': Adafruit_DHT.AM2302 }
if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
sensor = sensor_args[sys.argv[1]]
pin = sys.argv[2]
else:
print('usage: sudo ./Adafruit_DHT.py [11|22|2302] GPIOpin#')
print('example: sudo ./Adafruit_DHT.py 2302 4 - Read from an AM2302 connected to GPIO #4')
sys.exit(1)
# Try to grab a sensor reading. Use the read_retry method which will retry up
# to 15 times to get a sensor reading (waiting 2 seconds between each retry).
humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
# Un-comment the line below to convert the temperature to Fahrenheit.
# temperature = temperature * 9/5.0 + 32
# Note that sometimes you won't get a reading and
# the results will be null (because Linux can't
# guarantee the timing of calls to read the sensor).
# If this happens try again!
if humidity is not None and temperature is not None:
print('Temp={0:0.1f}* Humidity={1:0.1f}%'.format(temperature, humidity))
else:
print('Failed to get reading. Try again!')
sys.exit(1)
my .php looks like this:
<?php
$temp = exec('cat /root/Adafruit_Python_DHT/examples/AdafruitDHT.py |grep Temp=');
$temp = explode('Temp=',$temp);
$temp = round($temp,2);
echo $temp;
?>
I know that my first line is not correct like that.
But I don't know how to read out the live-temperature and live-Humidity. And I didn't know what to google for exactly.
edit 1:
with the following .php file, the site looks like this:
`
as you can see, it is only missing the output coming from the DHT22-sensor only.

Answer 1

If you do
cat /root/Adafruit_Python_DHT/examples/AdafruitDHT.py | grep Temp=
you are not running/executing the AdafruitDHT.py program, you are copying it contents (ie. the python program text) So what you will get back from the PHP exec is probably the matching line
print('Temp={0:0.1f}* Humidity={1:0.1f}%'.format(temperature, humidity))
Change that line to:
$temp = exec('python /root/Adafruit_Python_DHT/examples/AdafruitDHT.py | grep Temp=')
after making sure you are allowed to use a pipe (|) in a PHP exec call. (If not consider stripping the output of the script to only that what you want to have in PHP, dropping the | grep .... part).