handle Python exception/errors in PHP

Question

I am running some python script from within a PHP script using PHP's exec($cmd, $output) function.

The documentation states that the all output of the program is written to the $output array. This works fine, however, if the Python code raises an exception/error, the function seems to just return NULL, without any information on the exception.

for example:

run_python.py

print('starting python')
x = 1/0 #This will raise an error
print('complete python')

Running it from the interactive PHP shell yields the following:

php > $output = '';
php > $ret_val = exec('python run_python.py', $output);
Traceback (most recent call last):
  File "run_python.py", line 2, in <module>
    x = 1/0

The $output array only contains starting python, and $ret_val contains nothing.

This is OK for the interactive shell, but I am running the code from a web interface and the error information is never displayed. Is there any way to capture that error and then display it using echo?

I did try shell_exec and passthru, but without success.

Mark Baker · Accepted Answer · 2015-02-23 22:49:37Z

3

Redirect stderr to stdout

$ret_val = exec('python run_python.py 2>&1', $output);

answered Feb 23, 2015 at 22:49

Mark Baker

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Comments

nacho · Accepted Answer · 2017-05-23 07:45:49Z

1

You can do it with: exec ( 'python run_python.py', $output,$return_var ), you'll have the error code at $return_var and the traceback at $output, and you can see it by doing

exec ( 'python run_python.py', $output,$return_var );
if ($return_var>0) {
    var_dump($output);
}

answered May 23, 2017 at 7:45

nacho

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