Missing php exec output

I am trying to execute a python script to tag POS through PHP. But it does not return a full exit.

Python script:

import nltk
import sys

text = sys.argv[1]

tokenize_into_words = nltk.word_tokenize(text)

print text

result = nltk.pos_tag(tokenize_into_words)

print result

print "Done!"

Php script

$cmd = 'python /Library/WebServer/Documents/varticle/vcmdpos.py ' . $string2;

$tmp = exec($cmd,$output);

print_r($output);

Team:

python / Library / WebServer / Documents / varticle / vcmdpos.py Scientists

Observed output:

Array ([0] => Scientists)

Expected Conclusion:

Array ([0] => Scientists [1] => "[(" Scientists "," NNS ")]" [2] => "Done!")

When I run the command manually, it starts for about 5-10 seconds to run. [This may be due to the time required to mark the POS or import nltk.]

But when launched through PHP, it immediately returns and outputs an expression from nltk.pos_tag or print after it does not return.

Did I miss something?