如何在PHP中调用Python并获取运行结果

<fORM action="" method="post">
    请输入a:<input type="number" name="a" value="请输入a"><br> 请输入b:
    <input type="number" name="b" value="请输入b">
    <button type="submit">计算</button>
</form>
<?php
$aa = $_POST["a"];
$bb = $_POST["b"];
$cmd = shell_exec("python sum.py $aa $bb");
echo "a与b的和是： $cmd";
?>

import sys

a, b = sys.argv[1], sys.argv[2]   # 接收位置参数
print(int(a)+int(b))

import argparse
parser = argparse.ArgumentParser(description='manual to this script')
parser.add_argument('--gpus', type=str, default = None)
parser.add_argument('--batch-size', type=int, default=32)
args = parser.parse_args()
print args.gpus
print args.batch_size

python script.py --bool-val=0 # args.bool_val=True
python script.py --bool-val=False # args.bool_val=True
python script.py --bool-val=     # args.bool_val=什么都不写False

import argparse

parser = argparse.ArgumentParser(description='a demo of script')
parser.add_argument('--a', type=float, default=0.0)  # 添加变量
parser.add_argument('--b', type=float, default=1.0)

if __name__ == '__main__':
    args = parser.parse_args()   # 解析所有的命令行传入变量
    add(args.a, args.b)

python script.py --a=4.0 --b=3.0
#  另一种写法： python script.py --a 4.0 --b 3.0
#　返回结果7.0

python script.py -gpus=0,1,2 --batch_size=10

import tensorflow as tf
tf.app.flags.DEFINE_string('gpus', None, 'gpus to use')
tf.app.flags.DEFINE_integer('batch_size', 5, 'batch size')

FLAGS = tf.app.flags.FLAGS

def main(_):
    print FLAGS.gpus
    print FLAGS.batch_size

if __name__=="__main__":
    tf.app.run()

run(
    main=None,
    argv=None
)

# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language Governing permissions and
# limitations under the License.
# ==============================================================================

"""Implementation of the flags interface."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import argparse as _argparse
from tensorflow.python.util.all_util import remove_undocumented
_global_parser = _argparse.ArgumentParser()

# pylint: disable=invalid-name

class _FlagValues(object):
  """Global container and accessor for flags and their values."""

  def __init__(self):
    self.__dict__['__flags'] = {}
    self.__dict__['__parsed'] = False

  def _parse_flags(self, args=None):
    result, unparsed = _global_parser.parse_known_args(args=args)
    for flag_name, val in vars(result).items():
      self.__dict__['__flags'][flag_name] = val
    self.__dict__['__parsed'] = True
    return unparsed

  def __getattr__(self, name):
    """Retrieves the 'value' attribute of the flag --name."""
    if not self.__dict__['__parsed']:
      self._parse_flags()
    if name not in self.__dict__['__flags']:
      raise AttributeError(name)
    return self.__dict__['__flags'][name]

  def __setattr__(self, name, value):
    """Sets the 'value' attribute of the flag --name."""
    if not self.__dict__['__parsed']:
      self._parse_flags()
    self.__dict__['__flags'][name] = value

def _define_helper(flag_name, default_value, docstring, flagtype):
  """ReGISters 'flag_name' with 'default_value' and 'docstring'."""
  _global_parser.add_argument('--' + flag_name,
                              default=default_value,
                              help=docstring,
                              type=flagtype)


# Provides the global object that can be used to access flags.
FLAGS = _FlagValues()


def DEFINE_string(flag_name, default_value, docstring):
  """Defines a flag of type 'string'.
  Args:
    flag_name: The name of the flag as a string.
    default_value: The default value the flag should take as a string.
    docstring: A helpful message explaining the use of the flag.
  """
  _define_helper(flag_name, default_value, docstring, str)


def DEFINE_integer(flag_name, default_value, docstring):
  """Defines a flag of type 'int'.
  Args:
    flag_name: The name of the flag as a string.
    default_value: The default value the flag should take as an int.
    docstring: A helpful message explaining the use of the flag.
  """
  _define_helper(flag_name, default_value, docstring, int)


def DEFINE_boolean(flag_name, default_value, docstring):
  """Defines a flag of type 'boolean'.
  Args:
    flag_name: The name of the flag as a string.
    default_value: The default value the flag should take as a boolean.
    docstring: A helpful message explaining the use of the flag.
  """
  # Register a custom function for 'bool' so --flag=True works.
  def str2bool(v):
    return v.lower() in ('true', 't', '1')
  _global_parser.add_argument('--' + flag_name,
                              nargs='?',
                              const=True,
                              help=docstring,
                              default=default_value,
                              type=str2bool)

  # Add negated version, stay consistent with argparse with regard to
  # dashes in flag names.
  _global_parser.add_argument('--no' + flag_name,
                              action='store_false',
                              dest=flag_name.replace('-', '_'))


# The internal google library defines the following alias, so we match
# the API for consistency.
DEFINE_bool = DEFINE_boolean  # pylint: disable=invalid-name


def DEFINE_float(flag_name, default_value, docstring):
  """Defines a flag of type 'float'.
  Args:
    flag_name: The name of the flag as a string.
    default_value: The default value the flag should take as a float.
    docstring: A helpful message explaining the use of the flag.
  """
  _define_helper(flag_name, default_value, docstring, float)

_allowed_symbols = [
    # We rely on gflags documentation.
    'DEFINE_bool',
    'DEFINE_boolean',
    'DEFINE_float',
    'DEFINE_integer',
    'DEFINE_string',
    'FLAGS',
]
remove_undocumented(__name__, _allowed_symbols)